0000950170-22-022129 | 10-Q | XBRL Viewer

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Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2022	Oct. 31, 2022
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2022
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q3
Trading Symbol	KOP
Entity Registrant Name	KOPPERS HOLDINGS INC.
Entity Central Index Key	0001315257
Entity Current Reporting Status	Yes
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		20,898,005
Title of 12(b) Security	Common Stock
Security Exchange Name	NYSE
Entity Interactive Data Current	Yes
Entity Shell Company	false
Entity File Number	1-32737
Entity Tax Identification Number	20-1878963
Entity Address, Address Line One	436 Seventh Avenue
Entity Address, City or Town	Pittsburgh
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	15219
City Area Code	412
Local Phone Number	227-2001
Document Quarterly Report	true
Document Transition Report	false
Entity Incorporation, State or Country Code	PA

Condensed Consolidated Statement of Operations and Comprehensive (Loss) Income (Unaudited) - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Statement [Abstract]
Net sales	$ 536.1	$ 424.8	$ 1,497.9	$ 1,273.3
Cost of sales	439.7	348.9	1,229.4	1,012.1
Depreciation and amortization	16.9	13.4	44.5	43.4
Gain on sale of assets	0.0	0.0	(2.5)	(7.8)
Impairment and restructuring charges	0.0	0.1	0.0	2.2
Selling, general and administrative expenses	36.7	37.8	116.4	110.6
Operating profit	42.8	24.6	110.1	112.8
Other income, net	0.8	0.9	1.8	2.7
Interest expense	11.4	10.2	32.3	30.5
Income from continuing operations before income taxes	32.2	15.3	79.6	85.0
Income tax provision	13.2	4.8	29.7	22.4
Income from continuing operations	19.0	10.5	49.9	62.6
Gain (loss) on sale of discontinued operations, net of tax benefit of $0.0, $0.2, $0.3 and $0.0	0.0	(0.5)	(0.5)	0.1
Net income	19.0	10.0	49.4	62.7
Net loss attributable to noncontrolling interests	(0.1)	(0.2)	(0.2)	(0.3)
Net income attributable to Koppers	$ 19.1	$ 10.2	$ 49.6	$ 63.0
Basic -
Continuing operations	$ 0.91	$ 0.50	$ 2.38	$ 2.96
Discontinued operations	0.00	(0.02)	(0.02)	0.01
Earnings per basic common share	0.91	0.48	2.36	2.97
Diluted -
Continuing operations	0.91	0.49	2.35	2.87
Discontinued operations	0.00	(0.02)	(0.03)	0.00
Earnings per diluted common share	$ 0.91	$ 0.47	$ 2.32	$ 2.87
Comprehensive (loss) income	$ (9.5)	$ (17.4)	$ (27.7)	$ 45.7
Comprehensive loss attributable to noncontrolling interests	(0.4)	(0.2)	(0.6)	(0.2)
Comprehensive (loss) income attributable to Koppers	$ (9.1)	$ (17.2)	$ (27.1)	$ 45.9
Weighted average shares outstanding (in thousands):
Basic	20,897	21,322	21,024	21,253
Diluted	21,085	21,947	21,345	21,949

Condensed Consolidated Statement of Operations and Comprehensive (Loss) Income (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Statement [Abstract]
Income (loss) from discontinued operations, tax benefit	$ (0.0)	$ (0.2)	$ (0.3)	$ (0.0)

- Definition

Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.

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+ Details

Condensed Consolidated Balance Sheet - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Assets
Cash and cash equivalents, including restricted cash (Note 4)	$ 42.8	$ 45.5
Accounts receivable, net of allowance of $3.3	232.8	182.8
Inventories, net	306.0	313.8
Derivative contracts	3.4	61.0
Other current assets	23.8	25.0
Total current assets	608.8	628.1
Property, plant and equipment, net	527.2	489.1
Operating lease right-of-use assets	84.6	91.2
Goodwill	292.0	296.0
Intangible assets, net	119.1	131.5
Deferred tax assets	12.3	15.0
Other assets	8.7	11.0
Total assets	1,652.7	1,661.9
Liabilities
Accounts payable	187.1	171.9
Accrued liabilities	87.3	90.5
Current operating lease liabilities	19.4	21.3
Current maturities of long-term debt	0.0	2.0
Total current liabilities	293.8	285.7
Long-term debt	818.7	781.5
Accrued postretirement benefits	36.7	38.6
Deferred tax liabilities	20.7	33.4
Operating lease liabilities	66.2	70.3
Other long-term liabilities	44.2	41.6
Total liabilities	1,280.3	1,251.1
Commitments and contingent liabilities (Note 18)
Equity
Senior Convertible Preferred Stock, $0.01 par value per share; 10,000,000 shares authorized; no shares issued	0.0	0.0
Common Stock, $0.01 par value per share; 80,000,000 shares authorized; 24,523,231 and 24,026,844 shares issued	0.2	0.2
Additional paid-in capital	260.5	249.5
Retained earnings	347.4	300.9
Accumulated other comprehensive loss	(116.7)	(40.0)
Treasury stock, at cost, 3,608,208 and 2,930,694 shares	(122.5)	(104.0)
Total Koppers shareholders’ equity	368.9	406.6
Noncontrolling interests	3.5	4.2
Total equity	372.4	410.8
Total liabilities and equity	$ 1,652.7	$ 1,661.9

Condensed Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Statement Of Financial Position [Abstract]
Accounts receivable, allowance	$ 3.3	$ 3.3
Senior Convertible Preferred Stock, par value	$ 0.01	$ 0.01
Senior Convertible Preferred Stock, shares authorized	10,000,000	10,000,000
Senior Convertible Preferred Stock, shares issued	0	0
Common stock, par value	$ 0.01	$ 0.01
Common Stock, shares authorized	80,000,000	80,000,000
Common Stock, shares issued	24,523,231	24,026,844
Treasury stock, shares	3,608,208	2,930,694

Condensed Consolidated Statement of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash provided by (used in) operating activities:
Net income	$ 49.4	$ 62.7
Adjustments to reconcile net cash used in operating activities:
Depreciation and amortization	44.5	43.4
Stock-based compensation	10.0	9.8
Change in derivative contracts	9.0	2.7
Non-cash interest expense	2.2	2.0
(Gain) on sale of assets	(2.6)	(7.8)
Insurance proceeds	(0.7)	(3.6)
Deferred income taxes	1.1	1.0
Change in other liabilities	0.4	3.8
Other - net	5.3	2.6
Changes in working capital:
Accounts receivable	(59.0)	(26.7)
Inventories	(5.8)	(4.2)
Accounts payable	19.5	7.7
Accrued liabilities	(7.5)	(29.4)
Other working capital	1.6	(4.4)
Net cash provided by operating activities	67.4	59.6
Cash (used in) provided by investing activities:
Capital expenditures	(80.0)	(87.6)
Insurance proceeds received	0.7	3.6
Cash provided by sale of assets	4.2	5.3
Net cash used in investing activities	(75.1)	(78.7)
Cash provided by (used in) financing activities:
Net increase in credit facility borrowings	39.9	37.1
Repayments of long-term debt	(2.0)	(7.6)
Issuances of Common Stock	0.9	2.1
Repurchases of Common Stock	(18.5)	(3.3)
Payment of debt issuance costs	(4.8)	(0.0)
Dividends paid	(3.2)	(0.0)
Net cash provided by financing activities	12.3	28.3
Effect of exchange rate changes on cash	(7.3)	(2.8)
Net (decrease) increase in cash and cash equivalents	(2.7)	6.4
Cash and cash equivalents at beginning of period	45.5	38.5
Cash and cash equivalents at end of period	42.8	44.9
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash outflow from operating leases	21.9	23.2
Supplemental disclosure of non-cash investing and financing activities:
Right-of-use assets obtained in exchange for new operating lease liabilities	10.5	10.7
Non-cash investing activities
Accrued capital expenditures	$ 7.6	$ 8.6

Basis of Presentation

9 Months Ended

Sep. 30, 2022

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Basis of Presentation

1. Basis of Presentation

The accompanying unaudited condensed consolidated financial statements and related disclosures have been prepared in accordance with accounting principles generally accepted in the United States applicable to interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments considered necessary for a fair presentation of Koppers Holdings Inc.’s and its subsidiaries’ (“Koppers”, “Koppers Holdings”, the “Company”, “we” or “us”) financial position and interim results as of and for the periods presented have been included. All such adjustments are of a normal recurring nature unless disclosed otherwise. Because our business is seasonal, results for interim periods are not necessarily indicative of those that may be expected for a full year. The Condensed Consolidated Balance Sheet as of December 31, 2021 has been summarized from the audited balance sheet contained in the Annual Report on Form 10-K as of and for the year ended December 31, 2021. Certain prior period amounts in the condensed consolidated financial statements and notes to the condensed consolidated financial statements have been reclassified to conform to the current period’s presentation.

The financial information included herein should be read in conjunction with our audited consolidated financial statements and related notes included in our Annual Report on Form 10-K for the year ended December 31, 2021.

New Accounting Pronouncements	9 Months Ended
New Accounting Pronouncements	Sep. 30, 2022
Accounting Changes And Error Corrections [Abstract]
New Accounting Pronouncements	2. New Accounting Pronouncements In March 2022, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2022-01, “Derivatives and Hedging (Topic 815): Fair Value Hedging—Portfolio Layer Method.” This ASU amends and simplifies existing guidance in order to allow companies to more accurately present the economic effects of risk management activities in financial statements. ASU No. 2022-01 is effective for periods beginning after December 15, 2022, and earlier adoption is permitted. The adoption of this ASU will not have a material impact on our financial statements as we principally utilize cash flow hedges.

- Definition

The entire disclosure for change in accounting principle. Includes, but is not limited to, nature, reason, and method of adopting amendment to accounting standards or other change in accounting principle.

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+ Details

Plant Closures and Divestitures

9 Months Ended

Sep. 30, 2022

Discontinued Operations And Disposal Groups [Abstract]

Plant Closures and Divestitures

3. Plant Closures and Divestitures

We have restructured our Carbon Materials and Chemicals (“CMC”) segment in order to concentrate our facilities in regions where we believe we hold key competitive advantages to better serve our global customers. The recent restructuring activities which had an impact on our reported results include:

•

In February 2021, we sold our closed Follansbee, West Virginia coal tar distillation facility and we recorded a gain on sale of $5.7 million, consisting of $2.6 million from cash proceeds in addition to the assumption of certain liabilities by the buyer.

•

In September 2020, we sold Koppers (Jiangsu) Carbon Chemical Company Limited ("KJCC"). Refer to Note 4 - "Discontinued Operations" for more details.

•

In October 2018, we sold our closed Clairton, Pennsylvania coal tar distillation facility. In the first quarter of 2021, certain post-sale conditions were achieved and the buyer of the property released cash held in escrow to us resulting in a gain on sale of $1.8 million.

Other closure and divestiture activity relates to our Railroad and Utility Products and Services (“RUPS”) segment, including:

•

In March 2022, we sold our utility pole treating facility in Sweetwater, Tennessee and recorded a gain on sale of $2.5 million.

•

In October 2021, we sold our closed Denver, Colorado crosstie treating facility and recorded a gain on sale of $23.4 million.

Discontinued Operations

9 Months Ended

Sep. 30, 2022

Discontinued Operations And Disposal Groups [Abstract]

Discontinued Operations

4. Discontinued Operations

On September 30, 2020, we sold KJCC to Fangda Carbon New Material Co., Ltd and C-Chem Co., Ltd., a subsidiary of Nippon Steel Chemical & Material Co., Ltd. (the “Buyers”). KJCC was located in Pizhou, Jiangsu Province, China and was a 75 percent-owned coal tar distillation company which was part of our CMC segment. On December 23, 2021 and March 31, 2022, the Buyers issued various claims, which, after negotiation, were settled in April 2022 for $0.9 million, of which our share is $0.7 million. These claims were paid out of amounts held in escrow and the remaining escrow amount of $1.5 million was fully released in August 2022. In the third quarter of 2022, we recorded a charge of $0.5 million related to a tax indemnity claim from the Buyers which was paid in the fourth quarter of 2022.

The sale of KJCC represented a strategic shift that had a major effect on our operations and accordingly is classified as discontinued operations in our condensed consolidated financial statements and notes.

Fair Value Measurements

9 Months Ended

Sep. 30, 2022

Fair Value Disclosures [Abstract]

Fair Value Measurements

5. Fair Value Measurements

Carrying amounts and the related estimated fair values of our financial instruments as of September 30, 2022 and December 31, 2021 are as follows:


	September 30, 2022				December 31, 2021
	Fair Value		Carrying Value		Fair Value		Carrying Value
(Dollars in millions)
Financial assets:
Investments and other assets	$	1.3	$	1.3	$	1.3	$	1.3
Financial liabilities:
Long-term debt (including current portion)	$	789.3	$	826.8	$	804.1	$	789.1

Investments and other assets – Represents the broker-quoted cash surrender value on universal life insurance policies. This asset is classified as Level 2 in the valuation hierarchy and is measured from values received from financial institutions.

Debt – The fair value of our long-term debt is estimated based on the market prices for the same or similar issuances or on the current rates offered to us for debt of the same remaining maturities (Level 2). The fair value of our Credit Facility approximates carrying value due to the variable rate nature of this instrument.

Comprehensive (Loss) Income and Equity

9 Months Ended

Sep. 30, 2022

Equity [Abstract]

Comprehensive (Loss) Income and Equity

6. Comprehensive (Loss) Income and Equity

Total comprehensive (loss) income for the three and nine months ended September 30, 2022 and 2021 is summarized in the table below:


	Three Months Ended September 30,						Nine Months Ended September 30,
	2022			2021			2022			2021
(Dollars in millions)
Net income	$	19.0		$	10.0		$	49.4		$	62.7
Changes in other comprehensive (loss) income:
Currency translation adjustment		(20.1	)		(11.1	)		(40.7	)		(14.5	)
Unrealized (loss) on cash flow hedges, net of tax benefit of $4.9, $6.1, $21.1 and $1.2		(8.7	)		(16.6	)		(37.4	)		(3.3	)
Unrecognized pension net loss, net of tax expense of $0.1, $0.1, $0.2 and $0.3		0.3			0.3			1.0			0.8
Total comprehensive (loss) income		(9.5	)		(17.4	)		(27.7	)		45.7
Comprehensive loss attributable to noncontrolling interests		(0.4	)		(0.2	)		(0.6	)		(0.2	)
Comprehensive (loss) income attributable to Koppers	$	(9.1	)	$	(17.2	)	$	(27.1	)	$	45.9

Amounts reclassified from accumulated other comprehensive loss to net income consist of amounts shown for changes in or amortization of unrecognized pension net loss. This component of accumulated other comprehensive loss is included in the computation of net periodic pension cost as disclosed in Note 13 – “Pensions and Post-Retirement Benefit Plans.” Other amounts reclassified from accumulated other comprehensive loss related to derivative financial instruments of $5.8 million and $27.0 million for the three and nine months ended September 30, 2022, and $11.1 million and $31.0 million for the three and nine months ended September 30, 2021, respectively. The amounts in the preceding sentence are net of tax.

The following tables present the change in equity for the three months ended September 30, 2022 and 2021, respectively:


(Dollars in millions)	Common Stock		Additional Paid-In Capital		Retained Earnings			Accumulated Other Comprehensive Loss			Treasury Stock			Noncontrolling Interests			Total Equity
Balance at June 30, 2022	$	0.2	$	257.0	$	329.3		$	(88.7	)	$	(122.5	)	$	3.9		$	379.2
Net income		0.0		0.0		19.1			0.0			0.0			(0.1	)		19.0
Dividends		0.0		0.0		(1.0	)		0.0			0.0			0.0			(1.0	)
Issuance of common stock		0.0		0.3		0.0			0.0			0.0			0.0			0.3
Employee stock plans		0.0		3.2		0.0			0.0			0.0			0.0			3.2
Other comprehensive (loss) income
Currency translation adjustment		0.0		0.0		0.0			(19.6	)		0.0			(0.3	)		(19.9	)
Unrealized loss on cash flow hedges		0.0		0.0		0.0			(8.7	)		0.0			0.0			(8.7	)
Unrecognized pension net loss		0.0		0.0		0.0			0.3			0.0			0.0			0.3
Balance at September 30, 2022	$	0.2	$	260.5	$	347.4		$	(116.7	)	$	(122.5	)	$	3.5		$	372.4


(Dollars in millions)	Common Stock		Additional Paid-In Capital		Retained Earnings			Accumulated Other Comprehensive Loss			Treasury Stock			Noncontrolling Interests			Total Equity
Balance at June 30, 2021	$	0.2	$	242.7	$	268.8		$	(5.5	)	$	(94.4	)	$	4.3		$	416.1
Net income (loss)		0.0		0.0		10.2			0.0			0.0			(0.2	)		10.0
Issuance of common stock		0.0		0.3		0.0			0.0			0.0			0.0			0.3
Repurchases of common stock		0.0		0.0		0.0			0.0			(1.4	)		0.0			(1.4	)
Employee stock plans		0.0		3.3		0.0			0.0			0.0			0.0			3.3
Other comprehensive (loss) income
Currency translation adjustment		0.0		0.0		(0.3	)		(11.1	)		0.0			0.0			(11.4	)
Unrealized loss on cash flow hedges		0.0		0.0		0.0			(16.6	)		0.0			0.0			(16.6	)
Unrecognized pension net loss		0.0		0.0		0.0			0.3			0.0			0.0			0.3
Balance at September 30, 2021	$	0.2	$	246.2	$	278.8		$	(33.0	)	$	(95.8	)	$	4.1		$	400.5

The following tables present the change in equity for the nine months ended September 30, 2022 and 2021, respectively:


(Dollars in millions)	Common Stock		Additional Paid-In Capital		Retained Earnings			Accumulated Other Comprehensive Loss			Treasury Stock			Noncontrolling Interests			Total Equity
Balance at December 31, 2021	$	0.2	$	249.5	$	300.9		$	(40.0	)	$	(104.0	)	$	4.2		$	410.8
Net income		0.0		0.0		49.6			0.0			0.0			(0.2	)		49.4
Dividends		0.0		0.0		(3.2	)		0.0			0.0			0.0			(3.2	)
Issuance of common stock		0.0		0.9		0.0			0.0			0.0			0.0			0.9
Repurchases of common stock		0.0		0.0		0.0			0.0			(18.5	)		0.0			(18.5	)
Employee stock plans		0.0		10.1		0.0			0.0			0.0			0.0			10.1
Other comprehensive (loss) income
Currency translation adjustment		0.0		0.0		0.0			(40.2	)		0.0			(0.6	)		(40.8	)
Unrealized loss on cash flow hedges		0.0		0.0		0.0			(37.4	)		0.0			0.0			(37.4	)
Unrecognized pension net loss		0.0		0.0		0.0			1.0			0.0			0.0			1.0
Balance at September 30, 2022	$	0.2	$	260.5	$	347.4		$	(116.7	)	$	(122.5	)	$	3.5		$	372.4


(Dollars in millions)	Common Stock		Additional Paid-In Capital		Retained Earnings		Accumulated Other Comprehensive Loss			Treasury Stock			Noncontrolling Interests			Total Equity
Balance at December 31, 2020	$	0.2	$	234.1	$	215.8	$	(15.9	)	$	(92.5	)	$	4.3		$	346.0
Net income (loss)		0.0		0.0		63.0		0.0			0.0			(0.3	)		62.7
Issuance of common stock		0.0		2.2		0.0		0.0			0.0			0.0			2.2
Repurchases of common stock		0.0		0.0		0.0		0.0			(3.3	)		0.0			(3.3	)
Employee stock plans		0.0		9.9		0.0		0.0			0.0			0.0			9.9
Other comprehensive (loss) income
Currency translation adjustment		0.0		0.0		0.0		(10.2	)		0.0			0.1			(10.1	)
Cumulative translation adjustment loss on sale of subsidiary		0.0		0.0		0.0		(4.4	)		0.0			0.0			(4.4	)
Unrealized loss on cash flow hedges		0.0		0.0		0.0		(3.3	)		0.0			0.0			(3.3	)
Unrecognized pension net loss		0.0		0.0		0.0		0.8			0.0			0.0			0.8
Balance at September 30, 2021	$	0.2	$	246.2	$	278.8	$	(33.0	)	$	(95.8	)	$	4.1		$	400.5

On November 3, 2022, we declared a quarterly dividend of $0.05 per common share, payable on December 12, 2022 to shareholders of record as of November 25, 2022.

- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

+ References

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+ Details

Earnings per Common Share

9 Months Ended

Sep. 30, 2022

Earnings Per Share [Abstract]

Earnings per Common Share

7. Earnings per Common Share

The computation of basic earnings per common share for the periods presented is based upon the weighted average number of common shares outstanding during the periods. The computation of diluted earnings per common share includes the effect of non-vested nonqualified stock options and restricted stock units assuming such options and stock units were outstanding common shares at the beginning of the period. The effect of antidilutive securities is excluded from the computation of diluted loss per common share, if any.

The following table sets forth the computation of basic and diluted earnings per common share:


	Three Months Ended September 30,					Nine Months Ended September 30,
	2022		2021			2022			2021
(Dollars in millions, except share amounts, in thousands)
Net income attributable to Koppers	$	19.1	$	10.2		$	49.6		$	63.0
Less: Gain (loss) on sale of discontinued operations, net of tax of $0.0		0.0		(0.5	)		(0.5	)		0.1
Income from continuing operations attributable to Koppers	$	19.1	$	10.7		$	50.1		$	62.9
Weighted average common shares outstanding:
Basic		20,897		21,322			21,024			21,253
Effect of dilutive securities		188		625			321			696
Diluted		21,085		21,947			21,345			21,949
Earnings per common share – continuing operations:
Basic earnings per common share	$	0.91	$	0.50		$	2.38		$	2.96
Diluted earnings per common share		0.91		0.49			2.35			2.87
Other data:
Antidilutive securities excluded from computation of diluted earnings per common share		1,088		563			1,075			437

Stock-based Compensation

9 Months Ended

Sep. 30, 2022

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock-based Compensation

8. Stock-based Compensation

We have outstanding stock-based compensation awards that were granted under the amended and restated 2005 Long-Term Incentive Plan (the “2005 LTIP”), the 2018 Long-Term Incentive Plan (the “2018 LTIP”) and the 2020 Long-Term Incentive Plan, as amended (the “2020 LTIP”). The 2005 LTIP, the 2018 LTIP and the 2020 LTIP are collectively referred to as the “LTIP”. The LTIP provides for the grant to eligible persons of stock options, stock appreciation rights, restricted stock, restricted stock units, performance shares, performance awards, dividend equivalents and other stock-based awards, which are collectively referred to as the “awards.”

Restricted Stock Units and Performance Stock Units

Under the LTIP, the board of directors grants restricted stock units and performance stock units to certain employee participants (collectively, the “stock units”). Compensation expense for non-vested stock units is recorded over the vesting period based on the fair value at the date of grant. The fair value of restricted stock units is the market price of the underlying common stock on the date of grant and the fair value of performance stock units is determined using a Monte Carlo valuation model. For grants to most employees, the restricted stock units vest in four equal annual installments. Restricted stock units that have one-year vesting periods are also issued under the LTIP to members of the board of directors in connection with annual director compensation and, from time to time, are issued to employees in connection with employee compensation with vesting periods of typically two years or less.

Performance stock units have vesting based upon a market condition. These performance stock units have multi-year performance objectives and a three-year period for vesting (if the applicable performance objectives are achieved). The applicable performance objective is based on our total shareholder return relative to the Standard & Poor’s SmallCap 600 Materials Index. The number of performance stock units granted represents the target award and participants have the ability to earn between zero and 200 percent of the target award based upon actual performance. If minimum performance criteria are not achieved, no performance stock units will vest. We have the discretion to settle the award in cash rather than shares, although we currently expect that all awards will be settled by the issuance of shares.

We calculated the fair value of the performance stock unit awards on the date of grant using the assumptions listed below:


	January 2022 Grant			January 2021 Grant			March 2020 Grant
Grant date price per share of performance award	$	32.19		$	29.84		$	19.63
Expected dividend yield per share		0.00	%		0.00	%		0.00	%
Expected volatility		66.90	%		68.70	%		45.60	%
Risk-free interest rate		1.10	%		0.16	%		0.72	%
Look-back period in years		3.00			3.00			2.83
Grant date fair value per share	$	45.19		$	41.50		$	11.56

Dividends declared, if any, on our common stock during the period prior to vesting of the stock units are credited at equivalent value as additional stock units and become payable as additional common shares upon vesting. In the event of termination of employment, other than retirement, death or disability, any non-vested stock units are forfeited, including additional stock units credited from dividends. In the event of termination of employment due to retirement, death or disability, pro-rata vesting of the stock units over the service period will result. There are special vesting provisions for the stock units related to a change in control.

The following table shows a summary of the performance stock units as of September 30, 2022:


Performance Period	Minimum Shares		Target Shares		Maximum Shares
2020 – 2022		0		74,259		148,563
2021 – 2023		40,751		137,936		235,138
2022 – 2024		0		149,892		299,784

The following table shows a summary of the status and activity of non-vested stock units for the nine months ended September 30, 2022:


	Restricted Stock Units			Performance Stock Units			Total Stock Units			Weighted Average Grant Date Fair Value per Unit
Non-vested at December 31, 2021		505,905			474,166			980,071		$	30.79
Granted		247,760			151,236			398,996		$	35.92
Performance share adjustment		0			2,491			2,491		$	14.20
Vested		(193,462	)		(256,956	)		(450,418	)	$	34.47
Forfeited		(25,344	)		(8,848	)		(34,192	)	$	28.19
Non-vested at September 30, 2022		534,859			362,089			896,948		$	31.28

Stock Options

Stock options to executive officers vest and become exercisable in four equal annual installments. The stock options have a term of ten years. In the event of termination of employment, other than retirement, death or disability, any non-vested options are forfeited. In the event of termination of employment due to retirement, death or disability, pro-rata vesting of the options over the service period will result. There are special vesting provisions for the stock options related to a change in control.

Compensation expense for non-vested stock options is recorded over the vesting period based on the fair value at the date of grant. We calculated the fair value of stock options on the date of grant using the Black-Scholes-Merton model and the assumptions listed below:


	January 2022 Grant			January 2021 Grant			March 2020 Grant			March 2019 Grant
Grant date price per share of stock option award	$	32.19		$	29.84		$	19.63		$	26.63
Expected dividend yield per share		0.00	%		0.00	%		0.00	%		0.00	%
Expected life in years		6.76			6.64			6.40			6.14
Expected volatility		54.50	%		54.80	%		42.85	%		39.44	%
Risk-free interest rate		1.52	%		0.59	%		0.87	%		2.53	%
Grant date fair value per share of option awards	$	17.58		$	15.79		$	8.42		$	11.29

Prior to February 2022, we had not declared a dividend since 2014. The dividend yield is based on the Company’s current and prospective dividend rate which calculates a continuous dividend yield based upon the market price of the underlying common stock. The expected life in years is based on historical exercise data of options previously granted by us. Expected volatility is based on the historical volatility of our common stock and the historical volatility of certain other similar public companies. The risk-free interest rate is based on U.S. Treasury bill rates for the expected life of the option.

The following table shows a summary of the status and activity of stock options for the nine months ended September 30, 2022:


	Options			Weighted Average Exercise Price per Option		Weighted Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value (in millions)
Outstanding at December 31, 2021		1,054,166		$	26.89
Granted		98,108		$	32.19
Expired		(30,138	)	$	38.21
Outstanding at September 30, 2022		1,122,136		$	27.05		4.87	$	1.3
Exercisable at September 30, 2022		843,475		$	26.99		3.77	$	1.2

Stock Compensation Expense

Total stock-based compensation expense recognized under our LTIP and employee stock purchase plan for the three and nine months ended September 30, 2022 and 2021 is as follows:


	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
(Dollars in millions)
Stock-based compensation expense recognized:
Selling, general and administrative expenses	$	3.2	$	3.2	$	10.0	$	9.8
Less related income tax benefit		1.2		0.8		3.6		2.6
Decrease in net income attributable to Koppers	$	2.0	$	2.4	$	6.4	$	7.2
Intrinsic value of exercised stock options	$	0.0	$	0.0	$	0.0	$	2.2
Cash received from the exercise of stock options	$	0.0	$	0.0	$	0.0	$	2.3

As of September 30, 2022, total future compensation expense related to non-vested stock-based compensation arrangements is expected to total $21.6 million and the weighted-average period over which this expense is expected to be recognized is approximately 27 months.

Segment Information

9 Months Ended

Sep. 30, 2022

Segment Reporting [Abstract]

Segment Information

9. Segment Information

We have three reportable segments: RUPS, Performance Chemicals (“PC”) and CMC. Our reportable segments contain multiple aggregated business units since management believes the long-term financial performance of these business units is affected by similar economic conditions. The reportable segments are each managed separately because they manufacture and distribute distinct products with different production processes.

Our RUPS segment sells treated and untreated wood products, manufactured products and services primarily to the railroad and public utility markets. Railroad products and services include procuring and treating items such as crossties, switch ties and various types of lumber used for railroad bridges and crossings and the manufacture of rail joint bars. Utility products include transmission and distribution poles and pilings. The segment also operates a railroad services business that conducts engineering, design, repair and inspection services for railroad bridges, a business related to the recovery of used crossties and a business related to the inspection of utility poles.

Our PC segment develops, manufactures, and markets wood preservation chemicals and wood treatment technologies and services a diverse range of end-markets including infrastructure, residential and commercial construction, and agriculture.

Our CMC segment is primarily a manufacturer of creosote, carbon pitch, naphthalene, phthalic anhydride and carbon black feedstock. Creosote is used in the treatment of wood and carbon black feedstock is used in the production of carbon black. Carbon pitch is used in the production of aluminum and steel in electric arc furnaces. Naphthalene is used for the production of phthalic anhydride and as a surfactant in the production of concrete. Phthalic anhydride is used in the production of plasticizers, polyester resins and alkyd paints.

Our primary measure of segment profitability is adjusted earnings before interest, income taxes, depreciation, amortization and certain non-cash and/or non-recurring items that do not contribute directly to management’s evaluation of our operating results (as defined by us, “adjusted EBITDA"). These items include impairment, restructuring and plant closure costs, mark-to-market commodity hedging, gain or loss on sale of assets and LIFO inventory effects. This presentation is consistent with how our chief operating decision maker evaluates the results of operations and makes strategic decisions about the business. In addition, adjusted EBITDA is the primary measure used to determine the level of achievement of management’s short-term incentive goals and related payout. For these reasons, we believe that adjusted EBITDA represents the most relevant measure of segment profit and loss.

Consolidated adjusted EBITDA is reconciled to net income, the most directly comparable financial measure determined and reported in accordance with U.S. GAAP. The accounting policies of the reportable segments are the same as those described in the summary of significant accounting policies. Intersegment transactions are eliminated in consolidation.

Contract Balances

The timing of revenue recognition results in both billed accounts receivable and unbilled receivables, both classified as accounts receivable, net of allowance within the condensed consolidated balance sheet. Contract assets of $8.4 million and $7.9 million are recorded within accounts receivable, net of allowance within the condensed consolidated balance sheet as of September 30, 2022 and December 31, 2021, respectively.

The following table sets forth certain sales and operating data, net of all intersegment transactions, for our segments for the periods indicated:


	Three Months Ended September 30,						Nine Months Ended September 30,
	2022			2021			2022			2021
(Dollars in millions)
Revenues from external customers:
Railroad and Utility Products and Services	$	207.7		$	186.9		$	595.3		$	574.3
Performance Chemicals		153.1			115.2			439.1			384.4
Carbon Materials and Chemicals		175.3			122.7			463.5			314.6
Total	$	536.1		$	424.8		$	1,497.9		$	1,273.3
Intersegment revenues:
Performance Chemicals	$	6.8		$	3.9		$	16.7		$	11.2
Carbon Materials and Chemicals		19.9			18.9			57.4			55.2
Total	$	26.7		$	22.8		$	74.1		$	66.4
Depreciation and amortization expense:
Railroad and Utility Products and Services	$	5.6		$	5.3		$	16.5		$	16.9
Performance Chemicals		3.8			4.1			11.5			13.6
Carbon Materials and Chemicals		7.5			4.0			16.5			12.9
Total	$	16.9		$	13.4		$	44.5		$	43.4
Adjusted EBITDA:
Railroad and Utility Products and Services	$	15.5		$	10.7		$	40.3		$	39.1
Performance Chemicals		16.7			20.2			57.9			82.5
Carbon Materials and Chemicals		36.6			22.5			77.8			51.5
Items excluded from the determination of segment profit:
Impairment, restructuring and plant closure (costs) benefits		(0.3	)		0.7			(0.2	)		(4.3	)
Gain on sale of assets		0.0			0.0			2.5			7.8
LIFO expense		(6.1	)		(10.6	)		(12.9	)		(15.8	)
Mark-to-market commodity hedging losses		(1.9	)		(4.4	)		(9.0	)		(2.8	)
Corporate unallocated		0.0			0.5			0.0			1.6
Interest expense		(11.4	)		(10.2	)		(32.3	)		(30.5	)
Depreciation and amortization		(16.9	)		(14.1	)		(44.5	)		(44.1	)
Income tax provision		(13.2	)		(4.8	)		(29.7	)		(22.4	)
Discontinued operations		0.0			(0.5	)		(0.5	)		0.1
Net income	$	19.0		$	10.0		$	49.4		$	62.7

The following table sets forth revenues for significant product lines, net of all intersegment transactions, for our segments for the periods indicated:


	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
(Dollars in millions)
Railroad and Utility Products and Services:
Railroad treated products	$	120.6	$	107.1	$	348.2	$	327.6
Utility poles		63.0		59.6		178.7		186.2
Railroad infrastructure services		10.9		8.8		29.9		25.3
Rail joints		7.8		5.7		21.6		17.9
Other products		5.4		5.7		16.9		17.3
Total		207.7		186.9		595.3		574.3
Performance Chemicals:
Wood preservative products		148.3		110.1		419.2		366.4
Other products		4.8		5.1		19.9		18.0
Total		153.1		115.2		439.1		384.4
Carbon Materials and Chemicals:
Pitch and related products		109.6		70.4		270.0		177.7
Phthalic anhydride and other chemicals		31.6		19.7		85.0		52.2
Creosote and distillates		17.2		19.0		56.9		48.6
Naphthalene		9.1		6.2		26.1		15.5
Other products		7.8		7.4		25.5		20.6
Total		175.3		122.7		463.5		314.6
Total	$	536.1	$	424.8	$	1,497.9	$	1,273.3

The following table sets forth assets and goodwill allocated to each of our segments as of the dates indicated:


	September 30, 2022		December 31, 2021
(Dollars in millions)
Segment assets:
Railroad and Utility Products and Services	$	620.9	$	594.1
Performance Chemicals		516.3		586.9
Carbon Materials and Chemicals		487.6		447.1
All other		27.9		33.8
Total	$	1,652.7	$	1,661.9
Goodwill:
Railroad and Utility Products and Services	$	120.4	$	120.9
Performance Chemicals		171.6		175.1
Total	$	292.0	$	296.0

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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+ Details

Income Taxes

9 Months Ended

Sep. 30, 2022

Income Tax Disclosure [Abstract]

Income Taxes

10. Income Taxes

Effective Tax Rate

The income tax provision for interim periods is comprised of an estimated annual effective income tax rate applied to current year ordinary income and tax associated with discrete items. These discrete items generally relate to excess stock compensation deductions, changes in tax laws, adjustments to unrecognized tax benefits and changes of estimated tax liability to the actual liability determined upon filing income tax returns. To determine the annual effective tax rate, management is required to make estimates of annual pretax income in each domestic and foreign jurisdiction in which we conduct business. Entities that have historical pre-tax losses and current year estimated pre-tax losses that are not projected to generate a future benefit are excluded from the estimated annual effective income tax rate.

The estimated annual effective income tax rate, excluding discrete items, was 36.1 percent and 26.8 percent for the nine months ended September 30, 2022 and 2021, respectively. The estimated annual effective income tax rate differs from the U.S. federal statutory tax rate due to:


	September 30,
	2022			2021
Federal income tax rate		21.0	%		21.0	%
Foreign earnings taxed at different rates		6.8			3.6
Interest expense deduction limitation		5.9			0.0
Nondeductible expenses		1.6			1.3
State income taxes, net of federal tax benefit		0.6			0.8
Change in tax contingency reserves		0.1			0.1
GILTI inclusion, net of foreign tax credits		0.1			0.0
Estimated annual effective income tax rate		36.1	%		26.8	%

The interest expense deduction limitation is limited to 30.0 percent of adjusted taxable income as defined under the tax regulations. Starting January 1, 2022, the calculation of adjusted taxable income excludes an addback for depreciation and amortization whereas previous years’ determination of adjusted taxable income included an addback for depreciation and amortization. This change in the determination of adjusted taxable income has decreased the amount of interest expense we can deduct and has had a significant unfavorable impact on our estimated annual effective income tax rate for the current year.

Income taxes as a percentage of pretax income were 41.0 percent for the three months ended September 30, 2022. This is higher than the estimated annual effective income tax rate of 36.1 percent due to additional tax expense recognized in the current quarter as a result of increasing the estimated annual effective income tax rate utilized in the previous quarter.

Income taxes as a percentage of pretax income were 37.3 percent for the nine months ended September 30, 2022. This was higher than the estimated annual effective income tax rate of 36.1 percent due to forecasted pre-tax losses of certain foreign subsidiaries that are not expected to generate a future benefit.

During the year, management regularly updates estimates of pre-tax income and income tax expense based on changes in pre-tax income projections by taxable jurisdiction, repatriation of foreign earnings, unrecognized tax benefits and other tax matters. To the extent that actual results vary from these estimates, the actual annual effective income tax rate at the end of the year could be materially different from the estimated annual effective income tax rate as of September 30, 2022.

Unrecognized Tax Benefits

We file income tax returns in the U.S. federal jurisdiction, individual U.S. state jurisdictions and non-U.S. jurisdictions. With few exceptions, we are no longer subject to U.S. federal, U.S. state, or non-U.S. income tax examinations by tax authorities for years prior to 2016.

Unrecognized tax benefits totaled $1.4 million and $1.5 million as of September 30, 2022 and December 31, 2021. The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate, was approximately $1.4 million and $1.5 million as of September 30, 2022 and December 31, 2021. We recognize interest expense and any related penalties from unrecognized tax benefits in income tax expense. As of September 30, 2022 and December 31, 2021, we had accrued approximately $0.4 million for interest and penalties.

We do not anticipate material changes to the amount of unrecognized tax benefits within the next twelve months.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Inventories

9 Months Ended

Sep. 30, 2022

Inventory Disclosure [Abstract]

Inventories

11. Inventories

Net inventories as of September 30, 2022 and December 31, 2021 are summarized in the table below:


	September 30, 2022		December 31, 2021
(Dollars in millions)
Raw materials	$	264.1	$	266.8
Work in process		11.5		12.6
Finished goods		120.9		112.1
	$	396.5	$	391.5
Less revaluation to LIFO		90.5		77.7
Net	$	306.0	$	313.8

Property, Plant and Equipment

9 Months Ended

Sep. 30, 2022

Property Plant And Equipment [Abstract]

Property, Plant and Equipment

12. Property, Plant and Equipment

Property, plant and equipment as of September 30, 2022 and December 31, 2021 are summarized in the table below:


	September 30, 2022		December 31, 2021
(Dollars in millions)
Land	$	13.7	$	15.2
Buildings		73.1		75.8
Machinery and equipment		888.9		836.8
	$	975.7	$	927.8
Less accumulated depreciation		448.5		438.7
Net	$	527.2	$	489.1

Pensions and Post-Retirement Benefit Plans

9 Months Ended

Sep. 30, 2022

Compensation And Retirement Disclosure [Abstract]

Pensions and Post-Retirement Benefit Plans

13. Pensions and Post-Retirement Benefit Plans

We maintain a number of defined benefit and defined contribution plans to provide retirement benefits for employees in the United States, as well as employees outside the United States. These plans are maintained and contributions are made in accordance with the Employee Retirement Income Security Act of 1974 (“ERISA”), local statutory law or as determined by the board of directors. The defined benefit pension plans generally provide benefits based upon years of service and compensation. Pension plans are funded except for three domestic non-qualified defined benefit pension plans for certain key executives.

In the United States, all qualified and two of the non-qualified defined benefit pension plans for salaried and hourly employees have been frozen and are closed to new participants. Accordingly, these pension plans no longer accrue additional years of service or recognize future increases in compensation for benefit purposes.

With respect to our defined benefit pension plan in the United Kingdom, in 2021 we entered into a buy-in bulk annuity insurance policy in exchange for a premium payment of $67.8 million, which is subject to adjustment as a result of subsequent data cleansing activities. Under the terms of this buy-in insurance policy, the insurer is liable to pay the benefits of our defined benefit pension plan in the United Kingdom, but the plan still retains full legal responsibility to pay the benefits to the members of the plan using the insurance payments. The buy-in policy will be treated as a plan asset going forward until such time as the buy-in policy is converted to a buy-out policy, which is when individual insurance policies will be assigned to each member of the plan and the plan will no longer have legal responsibility to pay the benefits to the members. The data cleansing effort is expected to be completed in mid-2023 at which time the pension obligation will be irrevocably settled. Upon that event, we will recognize a pre-tax pension settlement loss of approximately $22 million.

The defined contribution plans generally provide retirement assets to employee participants based upon employer and employee contributions to the participant’s individual investment account. We also provide retiree medical insurance coverage to certain U.S. employees and a life insurance benefit to most U.S. employees. For salaried employees, the retiree medical and retiree life insurance plans have been closed to new participants.

The following table provides the components of net periodic benefit cost for the pension plans for the three and nine months ended September 30, 2022 and 2021:


	Three Months Ended September 30,						Nine Months Ended September 30,
	2022			2021			2022			2021
(Dollars in millions)
Service cost	$	0.3		$	0.4		$	0.9		$	1.1
Interest cost		1.4			1.1			4.3			3.8
Expected return on plan assets		(1.9	)		(1.8	)		(5.8	)		(5.5	)
Amortization of net loss		0.4			0.4			1.3			1.1
Net periodic benefit cost	$	0.2		$	0.1		$	0.7		$	0.5
Defined contribution plan expense	$	2.2		$	1.9		$	7.0		$	6.5

- Definition

The entire disclosure for retirement benefits.

+ References

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-URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

+ Details

Debt

9 Months Ended

Sep. 30, 2022

Debt Disclosure [Abstract]

Debt

4. Debt

Debt as of September 30, 2022 and December 31, 2021 was as follows:


	Weighted Average Interest Rate			Maturity	September 30, 2022		December 31, 2021
(Dollars in millions)
Term Loan		2.38	%	─	$	0.0	$	2.0
Revolving Credit Facility		2.38	%	─		0.0		287.1
Revolving Credit Facility		5.16	%	2027		326.8		0.0
Senior Notes due 2025		6.00	%	2025		500.0		500.0
Debt						826.8		789.1
Less short-term debt and current maturities of long-term debt						0.0		2.0
Less unamortized debt issuance costs						8.1		5.6
Long-term debt					$	818.7	$	781.5

Revolving Credit Facility

In June 2022, we entered into an $800.0 million revolving credit agreement (the “Credit Facility”) with a consortium of banks which replaced our previous $600.0 million senior secured revolving credit facility and $100.0 million senior secured term loan facility (the latter having been fully repaid as of March 31, 2022). The Credit Facility also provides for a $50.0 million swingline facility and provides for the ability to incur one or more uncommitted incremental revolving or term loan facilities in an aggregate amount of at least $730.0 million, subject to applicable financial covenants. The maturity date of the Credit Facility is in June 2027 subject to a springing maturity in the event the 2025 Notes (as defined below) are not repurchased, redeemed or refinanced prior to November 15, 2024. The interest rate on the Credit Facility is variable and may be based on the Secured Overnight Financing Rate (“SOFR”), which is the applicable benchmark for current borrowings, or an alternative benchmark depending on the borrowing type.

Borrowings under the Credit Facility are secured by a first priority lien on substantially all of the assets (excluding real property and other customary assets) of Koppers Inc., Koppers Holdings Inc. and their material domestic subsidiaries. The Credit Facility contains certain covenants that limit Koppers Inc. and its restricted subsidiaries, including, without limitation, limitations on additional indebtedness, liens, dividends, investments, acquisitions, subsidiary and certain other distributions, asset sales, transactions with affiliates and modifications to material documents, including organizational documents. In addition, such covenants give rise to events of default upon the failure by Koppers Inc. and its restricted subsidiaries to meet certain financial ratios.

As of September 30, 2022, we had approximately $400 million of unused revolving credit availability after restrictions from certain letter of credit commitments and other covenants. As of September 30, 2022, $7.8 million of commitments were utilized by outstanding undrawn letters of credit.

Senior Notes due 2025

Koppers Inc.’s $500 million Senior Notes due 2025 (the “2025 Notes”) are senior obligations of Koppers Inc., are unsecured and are guaranteed by Koppers Holdings Inc. and certain of Koppers Inc.’s domestic subsidiaries. The 2025 Notes pay interest semi-annually in arrears on February 15 and August 15 and will mature on February 15, 2025 unless earlier redeemed or repurchased. We are entitled to redeem all or a portion of the 2025 Senior Notes at a redemption price of 101.5 percent of principal value as of February 15, 2022 until April 15, 2023 when the 2025 Notes are redeemable at principal value.

The indenture governing the 2025 Senior Notes includes customary covenants that restrict, among other things, the ability of Koppers Inc. and its restricted subsidiaries to incur additional debt, pay dividends or make certain other restricted payments, incur liens, merge or sell all or substantially all of the assets of Koppers Inc. or its subsidiaries or enter into various transactions with affiliates.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References

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-Topic 470
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-Name Accounting Standards Codification
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Reference 12: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher FASB
-Name Accounting Standards Codification
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+ Details

Asset Retirement Obligations

9 Months Ended

Sep. 30, 2022

Asset Retirement Obligation Disclosure [Abstract]

Asset Retirement Obligations

5. Asset Retirement Obligations

We recognize asset retirement obligations for the removal and disposal of residues; dismantling of certain tanks required by governmental authorities; cleaning and dismantling costs for owned railcars; cleaning costs for leased rail-cars and barges; and site demolition, when required by governmental authorities or by contract. The following table reflects changes in the carrying values of asset retirement obligations:


	September 30, 2022			December 31, 2021
(Dollars in millions)
Asset retirement obligation at beginning of year	$	13.2		$	19.8
Accretion expense		0.8			1.0
Revision in estimated cash flows		3.3			(0.3	)
Cash expenditures		(0.6	)		(7.3	)
Currency translation		(0.2	)		0.0
Balance at end of period	$	16.5		$	13.2

Leases

9 Months Ended

Sep. 30, 2022

Leases [Abstract]

Leases

16. Leases

We recognize lease obligations and associated right-of-use assets for existing non-cancelable leases. We have non-cancelable operating leases primarily associated with railcars, office and manufacturing facilities, storage tanks, ships, production equipment and vehicles. Many of our leases include both lease (e.g., fixed rent) and non-lease components (e.g., maintenance and services). For certain asset classes such as railcars, storage tanks and ships, we have separated the lease and non-lease components based on the estimated stand-alone price for each component. For the remaining asset classes, we have elected to account for these components as a single lease component. In addition, we exclude leases expiring within twelve months from balance sheet recognition.

Many of our leases include one or more options to renew. We evaluate renewal options at the lease commencement date and regularly thereafter to determine if we are reasonably certain to exercise the option, in which case we include the renewal period in our lease term. As most of our leases do not provide an implicit rate, we use our incremental borrowing rate based on information available to determine the present value of the lease payments.

Lease expense for operating leases is recognized on a straight-line basis over the lease term. Variable lease expense is recognized in the period in which the obligation for those payments is incurred. Operating lease costs were $7.1 million and $21.8 million during the three and nine months ended September 30, 2022, respectively, and $7.5 million and $22.8 million during the three and nine months ended September 30, 2021, respectively. Variable lease costs were $0.9 million and $2.2 million during the three and nine months ended September 30, 2022, respectively, and $0.8 million and $2.7 million during the three and nine months ended September 30, 2021, respectively.

The following table presents information about the amount and timing of cash flows arising from our operating leases as of September 30, 2022:


(Dollars in millions)
2022	$	7.0
2023		23.7
2024		19.9
2025		16.2
2026		11.9
Thereafter		29.5
Total lease payments	$	108.2
Less: Interest		(22.6	)
Present value of lease liabilities	$	85.6

Supplemental condensed consolidated balance sheet information related to leases is as follows:


	September 30,			December 31,
	2022			2021
(Dollars in millions)
Operating leases:
Operating lease right-of-use assets	$	84.6		$	91.2
Current operating lease liabilities	$	19.4		$	21.3
Operating lease liabilities		66.2			70.3
Total operating lease liabilities	$	85.6		$	91.6
Weighted average remaining lease term, in years		5.7			5.8
Weighted average discount rate		7.3	%		7.4	%

Derivative Financial Instruments

9 Months Ended

Sep. 30, 2022

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Derivative Financial Instruments

17. Derivative Financial Instruments

We utilize derivative instruments to manage exposures to risks that have been identified, measured and are capable of being mitigated. The primary risks that we manage by using derivative instruments are commodity price risk associated with copper and foreign currency exchange risk associated with a number of currencies, principally the U.S. dollar, the Euro and British pounds. Swap contracts on copper are used to manage the price risk associated with forecasted purchases of materials used in our manufacturing processes. Generally, we will not hedge cash flow exposures for durations longer than 36 months and we have hedged certain volumes of copper through the end of 2023. We enter into foreign currency forward contracts to manage foreign currency risk associated with our receivable and payable balances in addition to foreign-denominated sales. Generally, we enter into master netting arrangements with the counterparties and offset net derivative positions with the same counterparties. Currently, our agreements do not require cash collateral.

The Company recognizes all derivative instruments as either assets or liabilities at fair value on the balance sheet. A derivative instrument's fair value is determined using significant other observable inputs, a Level 2 fair value measurement. We designate certain of our commodity swaps as cash flow hedges of forecasted purchases of commodities. For derivative instruments that are designated and qualify as cash flow hedges, the effective portion of the gain or loss on the derivative is reported as a component of other comprehensive (loss) income and is reclassified into earnings in the same period or periods during which the hedged transaction affects earnings. Gains and losses on the derivative instruments representing hedge ineffectiveness are recognized in current earnings.

For those commodity swaps where hedge accounting is not elected, the fair value of the commodity swap is recognized as an asset or liability on the consolidated balance sheet and the related gain or loss on the derivative is reported in current earnings. These amounts are classified in cost of sales in the condensed consolidated statement of operations.

As of September 30, 2022 and December 31, 2021, we had outstanding copper swap contracts of the following amounts:


	Units Outstanding (in Pounds)				Net Fair Value - Asset (in Dollars)
	September 30, 2022		December 31, 2021		September 30, 2022			December 31, 2021
(Amounts in millions)
Cash flow hedges		12.1		29.0	$	4.4		$	53.8
Contracts where hedge accounting was not elected		7.6		6.1		(2.0	)		7.1
Total		19.7		35.1	$	2.4		$	60.9

As of September 30, 2022 and December 31, 2021, the fair value of the outstanding copper swap contracts is recorded in the balance sheet as follows:


	September 30, 2022			December 31, 2021
(Dollars in millions)
Derivative contracts	$	3.4		$	60.9
Accrued liabilities		(0.4	)		0.0
Other long-term liabilities		(0.6	)		0.0
Net asset on balance sheet	$	2.4		$	60.9
Accumulated other comprehensive gain, net of tax	$	3.7		$	40.6

We estimate that $3.9 million of unrealized gains, net of tax, related to commodity price hedging will be reclassified from other comprehensive (loss) income into earnings over the next twelve months.

See Note 6 – “Comprehensive (Loss) Income and Equity”, for amounts recorded in other comprehensive loss and for amounts reclassified from accumulated other comprehensive loss into net income for the periods specified below.

For the three and nine months ended September 30, 2022 and 2021, the unrealized (loss) gain from contracts where hedge accounting was not elected is as follows:


	Three Months Ended September 30,						Nine Months Ended September 30,
	2022			2021			2022			2021
(Dollars in millions)
(Loss) from contracts where hedge accounting was not elected		(1.9	)		(4.4	)		(9.0	)		(2.7	)

The fair value associated with forward contracts related to foreign currency that are not designated as hedges are immediately charged to earnings. These amounts are classified in cost of sales in the condensed consolidated statement of operations and comprehensive (loss) income.

As of September 30, 2022 and December 31, 2021, the fair value of outstanding foreign currency forward contracts is recorded in the balance sheet as follows:


	September 30, 2022			December 31, 2021
(Dollars in millions)
Derivative contracts	$	0.0		$	0.1
Accrued liabilities		(0.8	)		(0.4	)
Net liability on balance sheet	$	(0.8	)	$	(0.3	)

As of September 30, 2022 and December 31, 2021, the net currency units outstanding for these contracts were:


	September 30, 2022		December 31, 2021
(In millions)
United States Dollars		USD 11.7		USD 21.4

Commitments and Contingent Liabilities

9 Months Ended

Sep. 30, 2022

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingent Liabilities

18. Commitments and Contingent Liabilities

We are involved in litigation and various proceedings relating to environmental laws and regulations, product liability and other matters. Certain of these matters are discussed below. The ultimate resolution of these contingencies is subject to significant uncertainty and should we fail to prevail in any of these legal matters or should several of these legal matters be resolved against us in the same reporting period, these legal matters could, individually or in the aggregate, be material to the condensed consolidated financial statements.

Legal Proceedings

Coal Tar Pitch Cases. Koppers Inc. is one of several defendants in lawsuits filed in two states in which the plaintiffs claim they suffered a variety of illnesses (including cancer) as a result of exposure to coal tar pitch sold by the defendants. There were 53 plaintiffs in 28 cases pending as of September 30, 2022, compared to 59 plaintiffs in 31 cases pending as of December 31, 2021. As of September 30, 2022, there were 27 cases pending in the Court of Common Pleas of Allegheny County, Pennsylvania, and one case pending in the Circuit Court of Knox County, Tennessee.

The plaintiffs in all 28 pending cases seek to recover compensatory damages. Plaintiffs in 24 of those cases also seek to recover punitive damages. The plaintiffs in the 27 cases filed in Pennsylvania seek unspecified damages in excess of the court’s minimum jurisdictional limit. The plaintiff in the Tennessee state court case seeks damages of $15.0 million. The other defendants in these lawsuits vary from case to case and include companies such as Beazer East, Inc. (“Beazer East”), Honeywell International Inc., Graftech International Holdings, Dow Chemical Company, UCAR Carbon Company, Inc., and SGL Carbon Corporation. Discovery is proceeding in these cases. No trial dates have been set in any of these cases.

We have not provided a reserve for the coal tar pitch lawsuits because, at this time, we cannot reasonably determine the probability of a loss, and the amount of loss, if any, cannot be reasonably estimated. The timing of resolution of these cases cannot be reasonably determined. Although Koppers Inc. is vigorously defending these cases, an unfavorable resolution of these matters may have a material adverse effect on our business, financial condition, cash flows and results of operations.

Environmental and Other Litigation Matters

We are subject to federal, state, local and foreign laws and regulations and potential liabilities relating to the protection of the environment and human health and safety including, among other things, the cleanup of contaminated sites, the treatment, storage and disposal of wastes, the discharge of effluent into waterways, the emission of substances into the air and various health and safety matters. We expect to incur substantial costs for ongoing compliance with such laws and regulations. We may also face governmental or third-party claims, or otherwise incur costs, relating to cleanup of, or for injuries resulting from, contamination at sites associated with past and present operations. We accrue for environmental liabilities when a determination can be made that a liability is probable and reasonably estimable.

Environmental and Other Liabilities Retained or Assumed by Others. We have agreements with former owners of certain of our operating locations under which the former owners retained, assumed and/or agreed to indemnify us against certain environmental and other liabilities. The most significant of these agreements was entered into at Koppers Inc.’s formation on December 29, 1988 (the “Acquisition”). Under the related asset purchase agreement between Koppers Inc. and Beazer East, subject to certain limitations, Beazer East retained the responsibility for and agreed to indemnify Koppers Inc. against certain liabilities, damages, losses and costs, including, with certain limited exceptions, liabilities under and costs to comply with environmental laws to the extent attributable to acts or omissions occurring prior to the Acquisition and liabilities related to products sold by Beazer East prior to the Acquisition (the “Indemnity”). Beazer Limited, the parent company of Beazer East, unconditionally guaranteed Beazer East’s performance of the Indemnity pursuant to a guarantee (the “Guarantee”).

The Indemnity provides different mechanisms, subject to certain limitations, by which Beazer East is obligated to indemnify Koppers Inc. with regard to certain environmental, product and other liabilities and imposes certain conditions on Koppers Inc. before receiving such indemnification, including, in some cases, certain limitations regarding the time period as to which claims for indemnification can be brought. In July 2004, Koppers Inc. and Beazer East agreed to amend the environmental indemnification provisions of the December 29, 1988 asset purchase agreement to extend the indemnification period for pre-closing environmental liabilities, subject to the following paragraph, and agreed to share toxic tort litigation defense arising from any sites acquired from Beazer East.

Qualified expenditures under the Indemnity are not subject to a monetary limit. Qualified expenditures under the Indemnity include (i) environmental cleanup liabilities required by third parties, such as investigation, remediation and closure costs, relating to pre-December 29, 1988 (“Pre-Closing”) acts or omissions of Beazer East or its predecessors; (ii) environmental claims by third parties for personal injuries, property damages and natural resources damages relating to Pre-Closing acts or omissions of Beazer East or its predecessors; (iii) punitive damages for the acts or omissions of Beazer East and its predecessors without regard to the date of the alleged conduct and (iv) product liability claims for products sold by Beazer East or its predecessors without regard to the date of the alleged conduct. The indemnification period ended July 14, 2019 (the “Claim Deadline”) and Beazer East may now tender certain third-party claims described in sections (i) and (ii) above to Koppers Inc. However, to the extent the third-party claims described in sections (i) and (ii) above were tendered to Beazer East by the Claim Deadline, Beazer East will continue to be required to pay the costs arising from such claims under the Indemnity. Furthermore, the Claim Deadline did not change the provisions of the Indemnity with respect to indemnification for non-environmental claims, such as product liability claims, which claims may continue to be tendered by Koppers Inc. to Beazer East.

The Indemnity provides for the resolution of issues between Koppers Inc. and Beazer East by an arbitrator on an expedited basis upon the request of either party. The arbitrator could be asked, among other things, to make a determination regarding the allocation of environmental responsibilities between Koppers Inc. and Beazer East. Arbitration decisions under the Indemnity are final and binding on the parties.

Contamination has been identified at most manufacturing and other sites of our subsidiaries. One site currently owned and operated by Koppers Inc. in the United States is listed on the National Priorities List promulgated under the Comprehensive Environmental Response, Compensation, and Liability Act of 1980, as amended (“CERCLA”). Currently, at the properties acquired from Beazer East (which includes the National Priorities List site and all but one of the sites permitted under the Resource Conservation and Recovery Act (“RCRA”)), a significant portion of all investigative, cleanup and closure activities are being conducted and paid for by Beazer East pursuant to the terms of the Indemnity. In addition, other of Koppers Inc.’s sites are or have been operated under RCRA and various other environmental permits, and remedial and closure activities are being conducted at some of these sites.

To date, the parties that retained, assumed and/or agreed to indemnify us against the liabilities referred to above, including Beazer East, have performed their obligations in all material respects. We believe that, for the last three years ended December 31, 2021, amounts paid by Beazer East as a result of its environmental remediation obligations under the Indemnity have averaged, in total, approximately $6.4 million per year. Periodically, issues have arisen between Koppers Inc. and Beazer East and/or other indemnitors that have been resolved without arbitration. Koppers Inc. and Beazer East engage in discussions from time to time that involve, among other things, the allocation of environmental costs related to certain operating and closed facilities.

If for any reason (including disputed coverage or financial incapability) one or more of such parties fail to perform their obligations and we are held liable for or otherwise required to pay all or part of such liabilities without reimbursement, the imposition of such liabilities on us could have a material adverse effect on our business, financial condition, cash flows and results of operations. Furthermore, we could be required to record a contingent liability on our balance sheet with respect to such matters, which could result in a negative impact to our business, financial condition, cash flows and results of operations.

Domestic Environmental Matters. Koppers Inc. has been named as one of the potentially responsible parties (“PRPs”) at the Portland Harbor CERCLA site located on the Willamette River in Oregon. Koppers Inc. operated a coal tar pitch terminal near the site. Koppers Inc. has responded to an EPA information request and has executed a PRP agreement which outlines a private process to develop an allocation of past and future costs among more than 80 parties to the site. Koppers Inc. believes it is a de minimis contributor at the site.

The EPA issued its Record of Decision (“ROD”) in January 2017 for the Portland Harbor CERCLA site. The selected remedy includes a combination of sediment removal, capping, enhanced and monitored natural recovery and riverbank improvements. The ROD does not determine who is responsible for remediation costs. At that time, the net present value and undiscounted costs of the selected remedy as estimated in the ROD were approximately $1.1 billion and $1.7 billion, respectively. These costs may increase given the remedy will not be implemented for several years. Responsibility for implementing and funding that work will be decided in the separate private allocation process which is ongoing.

Additionally, Koppers Inc. is involved in two separate matters involving natural resource damages at the Portland Harbor site. One matter involves claims by the trustees to recover damages based upon an assessment of damages to natural resources caused by the releases of hazardous substances to the Willamette River. The assessment serves as the foundation to estimate liabilities for settlements of natural resource damages claims or litigation to recover from those who do not settle with the trustee groups. Koppers Inc. has been engaged in a process to resolve its natural resource damage liabilities for the assessment area. A second matter involves a lawsuit filed in January 2017 by the Yakama Nation in Oregon federal court. Yakama Nation seeks recovery for response costs and the costs of assessing injury to natural resources in waterways beyond the current assessment area. Following the most recent court rulings, the Yakama Nation case has been stayed pending completion of the private allocation process for the Portland Harbor CERCLA site.

In September 2009, Koppers Inc. received a general notice letter stating that it may be a PRP at the Newark Bay CERCLA site. In January 2010, Koppers Inc. submitted a response to the general notice letter asserting that Koppers Inc. is a de minimis party at this site.

We have accrued the estimated costs of participating in the PRP group at the Portland Harbor and Newark Bay CERCLA sites and estimated de minimis contributor settlement amounts at the sites totaling $3.3 million as of September 30, 2022. The actual cost could be materially higher as there has not been a determination of how those costs will be allocated among the PRPs at the sites. Accordingly, an unfavorable resolution of these matters may have a material adverse effect on our business, financial condition, cash flows and results of operations.

There are two plant sites related to the Performance Chemicals business and one plant site related to the Utility and Industrial Products business in the United States where we have recorded environmental remediation liabilities for soil and groundwater contamination which occurred prior to our acquisition of the businesses. As of September 30, 2022, our estimated environmental remediation liability for these acquired sites totals $3.9 million.

Foreign Environmental Matters. There is one plant site related to the Performance Chemicals business located in Australia where we have recorded an environmental remediation liability for soil and groundwater contamination which occurred prior to the acquisition of the business. As of September 30, 2022, our estimated environmental remediation liability for the acquired site totals $1.2 million.

Environmental Reserves Rollforward. The following table reflects changes in the accrual for environmental remediation. A total of $2.4 million and $2.8 million are classified as current liabilities as of September 30, 2022 and December 31, 2021:


	Period ended
	September 30, 2022			December 31, 2021
(Dollars in millions)
Balance at beginning of year	$	10.7		$	11.0
Expense		0.4			0.3
Reversal of reserves		0.0			(0.1	)
Cash expenditures		(0.7	)		(0.4	)
Currency translation		(0.3	)		(0.1	)
Balance at end of period	$	10.1		$	10.7

Subsequent Events

9 Months Ended

Sep. 30, 2022

Subsequent Events [Abstract]

Subsequent Events

19. Subsequent Events

In October 2022, we acquired substantially all of the assets of Gross & Janes Co. for approximately $15 million. Gross & Janes, headquartered in Kirkwood, Missouri, is the largest independent supplier of untreated railroad crossties in North America, with operations in Missouri, Arkansas and Texas.

New Accounting Pronouncements (Policies)	9 Months Ended
New Accounting Pronouncements (Policies)	Sep. 30, 2022
Accounting Changes And Error Corrections [Abstract]
New Accounting Pronouncements	In March 2022, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2022-01, “Derivatives and Hedging (Topic 815): Fair Value Hedging—Portfolio Layer Method.” This ASU amends and simplifies existing guidance in order to allow companies to more accurately present the economic effects of risk management activities in financial statements. ASU No. 2022-01 is effective for periods beginning after December 15, 2022, and earlier adoption is permitted. The adoption of this ASU will not have a material impact on our financial statements as we principally utilize cash flow hedges.

Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2022

Fair Value Disclosures [Abstract]

Schedule of Company's Financial Instruments

Carrying amounts and the related estimated fair values of our financial instruments as of September 30, 2022 and December 31, 2021 are as follows:


	September 30, 2022				December 31, 2021
	Fair Value		Carrying Value		Fair Value		Carrying Value
(Dollars in millions)
Financial assets:
Investments and other assets	$	1.3	$	1.3	$	1.3	$	1.3
Financial liabilities:
Long-term debt (including current portion)	$	789.3	$	826.8	$	804.1	$	789.1

Comprehensive (Loss) Income and Equity (Tables)

9 Months Ended

Sep. 30, 2022

Equity [Abstract]

Schedule of Comprehensive (Loss) Income

Total comprehensive (loss) income for the three and nine months ended September 30, 2022 and 2021 is summarized in the table below:


	Three Months Ended September 30,						Nine Months Ended September 30,
	2022			2021			2022			2021
(Dollars in millions)
Net income	$	19.0		$	10.0		$	49.4		$	62.7
Changes in other comprehensive (loss) income:
Currency translation adjustment		(20.1	)		(11.1	)		(40.7	)		(14.5	)
Unrealized (loss) on cash flow hedges, net of tax benefit of $4.9, $6.1, $21.1 and $1.2		(8.7	)		(16.6	)		(37.4	)		(3.3	)
Unrecognized pension net loss, net of tax expense of $0.1, $0.1, $0.2 and $0.3		0.3			0.3			1.0			0.8
Total comprehensive (loss) income		(9.5	)		(17.4	)		(27.7	)		45.7
Comprehensive loss attributable to noncontrolling interests		(0.4	)		(0.2	)		(0.6	)		(0.2	)
Comprehensive (loss) income attributable to Koppers	$	(9.1	)	$	(17.2	)	$	(27.1	)	$	45.9

Schedule of Change in Equity

The following tables present the change in equity for the three months ended September 30, 2022 and 2021, respectively:


(Dollars in millions)	Common Stock		Additional Paid-In Capital		Retained Earnings			Accumulated Other Comprehensive Loss			Treasury Stock			Noncontrolling Interests			Total Equity
Balance at June 30, 2022	$	0.2	$	257.0	$	329.3		$	(88.7	)	$	(122.5	)	$	3.9		$	379.2
Net income		0.0		0.0		19.1			0.0			0.0			(0.1	)		19.0
Dividends		0.0		0.0		(1.0	)		0.0			0.0			0.0			(1.0	)
Issuance of common stock		0.0		0.3		0.0			0.0			0.0			0.0			0.3
Employee stock plans		0.0		3.2		0.0			0.0			0.0			0.0			3.2
Other comprehensive (loss) income
Currency translation adjustment		0.0		0.0		0.0			(19.6	)		0.0			(0.3	)		(19.9	)
Unrealized loss on cash flow hedges		0.0		0.0		0.0			(8.7	)		0.0			0.0			(8.7	)
Unrecognized pension net loss		0.0		0.0		0.0			0.3			0.0			0.0			0.3
Balance at September 30, 2022	$	0.2	$	260.5	$	347.4		$	(116.7	)	$	(122.5	)	$	3.5		$	372.4


(Dollars in millions)	Common Stock		Additional Paid-In Capital		Retained Earnings			Accumulated Other Comprehensive Loss			Treasury Stock			Noncontrolling Interests			Total Equity
Balance at June 30, 2021	$	0.2	$	242.7	$	268.8		$	(5.5	)	$	(94.4	)	$	4.3		$	416.1
Net income (loss)		0.0		0.0		10.2			0.0			0.0			(0.2	)		10.0
Issuance of common stock		0.0		0.3		0.0			0.0			0.0			0.0			0.3
Repurchases of common stock		0.0		0.0		0.0			0.0			(1.4	)		0.0			(1.4	)
Employee stock plans		0.0		3.3		0.0			0.0			0.0			0.0			3.3
Other comprehensive (loss) income
Currency translation adjustment		0.0		0.0		(0.3	)		(11.1	)		0.0			0.0			(11.4	)
Unrealized loss on cash flow hedges		0.0		0.0		0.0			(16.6	)		0.0			0.0			(16.6	)
Unrecognized pension net loss		0.0		0.0		0.0			0.3			0.0			0.0			0.3
Balance at September 30, 2021	$	0.2	$	246.2	$	278.8		$	(33.0	)	$	(95.8	)	$	4.1		$	400.5

The following tables present the change in equity for the nine months ended September 30, 2022 and 2021, respectively:


(Dollars in millions)	Common Stock		Additional Paid-In Capital		Retained Earnings			Accumulated Other Comprehensive Loss			Treasury Stock			Noncontrolling Interests			Total Equity
Balance at December 31, 2021	$	0.2	$	249.5	$	300.9		$	(40.0	)	$	(104.0	)	$	4.2		$	410.8
Net income		0.0		0.0		49.6			0.0			0.0			(0.2	)		49.4
Dividends		0.0		0.0		(3.2	)		0.0			0.0			0.0			(3.2	)
Issuance of common stock		0.0		0.9		0.0			0.0			0.0			0.0			0.9
Repurchases of common stock		0.0		0.0		0.0			0.0			(18.5	)		0.0			(18.5	)
Employee stock plans		0.0		10.1		0.0			0.0			0.0			0.0			10.1
Other comprehensive (loss) income
Currency translation adjustment		0.0		0.0		0.0			(40.2	)		0.0			(0.6	)		(40.8	)
Unrealized loss on cash flow hedges		0.0		0.0		0.0			(37.4	)		0.0			0.0			(37.4	)
Unrecognized pension net loss		0.0		0.0		0.0			1.0			0.0			0.0			1.0
Balance at September 30, 2022	$	0.2	$	260.5	$	347.4		$	(116.7	)	$	(122.5	)	$	3.5		$	372.4


(Dollars in millions)	Common Stock		Additional Paid-In Capital		Retained Earnings		Accumulated Other Comprehensive Loss			Treasury Stock			Noncontrolling Interests			Total Equity
Balance at December 31, 2020	$	0.2	$	234.1	$	215.8	$	(15.9	)	$	(92.5	)	$	4.3		$	346.0
Net income (loss)		0.0		0.0		63.0		0.0			0.0			(0.3	)		62.7
Issuance of common stock		0.0		2.2		0.0		0.0			0.0			0.0			2.2
Repurchases of common stock		0.0		0.0		0.0		0.0			(3.3	)		0.0			(3.3	)
Employee stock plans		0.0		9.9		0.0		0.0			0.0			0.0			9.9
Other comprehensive (loss) income
Currency translation adjustment		0.0		0.0		0.0		(10.2	)		0.0			0.1			(10.1	)
Cumulative translation adjustment loss on sale of subsidiary		0.0		0.0		0.0		(4.4	)		0.0			0.0			(4.4	)
Unrealized loss on cash flow hedges		0.0		0.0		0.0		(3.3	)		0.0			0.0			(3.3	)
Unrecognized pension net loss		0.0		0.0		0.0		0.8			0.0			0.0			0.8
Balance at September 30, 2021	$	0.2	$	246.2	$	278.8	$	(33.0	)	$	(95.8	)	$	4.1		$	400.5

Earnings per Common Share (Tables)

9 Months Ended

Sep. 30, 2022

Earnings Per Share [Abstract]

Schedule of Computation of Basic and Diluted Earnings per Common Share

The following table sets forth the computation of basic and diluted earnings per common share:


	Three Months Ended September 30,					Nine Months Ended September 30,
	2022		2021			2022			2021
(Dollars in millions, except share amounts, in thousands)
Net income attributable to Koppers	$	19.1	$	10.2		$	49.6		$	63.0
Less: Gain (loss) on sale of discontinued operations, net of tax of $0.0		0.0		(0.5	)		(0.5	)		0.1
Income from continuing operations attributable to Koppers	$	19.1	$	10.7		$	50.1		$	62.9
Weighted average common shares outstanding:
Basic		20,897		21,322			21,024			21,253
Effect of dilutive securities		188		625			321			696
Diluted		21,085		21,947			21,345			21,949
Earnings per common share – continuing operations:
Basic earnings per common share	$	0.91	$	0.50		$	2.38		$	2.96
Diluted earnings per common share		0.91		0.49			2.35			2.87
Other data:
Antidilutive securities excluded from computation of diluted earnings per common share		1,088		563			1,075			437

Stock-based Compensation (Tables)

9 Months Ended

Sep. 30, 2022

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Stock Options And Performance Award Fair Value Assumptions

We calculated the fair value of stock options on the date of grant using the Black-Scholes-Merton model and the assumptions listed below:


	January 2022 Grant			January 2021 Grant			March 2020 Grant			March 2019 Grant
Grant date price per share of stock option award	$	32.19		$	29.84		$	19.63		$	26.63
Expected dividend yield per share		0.00	%		0.00	%		0.00	%		0.00	%
Expected life in years		6.76			6.64			6.40			6.14
Expected volatility		54.50	%		54.80	%		42.85	%		39.44	%
Risk-free interest rate		1.52	%		0.59	%		0.87	%		2.53	%
Grant date fair value per share of option awards	$	17.58		$	15.79		$	8.42		$	11.29

Summary of Performance Stock Units

The following table shows a summary of the performance stock units as of September 30, 2022:


Performance Period	Minimum Shares		Target Shares		Maximum Shares
2020 – 2022		0		74,259		148,563
2021 – 2023		40,751		137,936		235,138
2022 – 2024		0		149,892		299,784

Summary of Status and Activity of Non-Vested Stock Awards

The following table shows a summary of the status and activity of non-vested stock units for the nine months ended September 30, 2022:


	Restricted Stock Units			Performance Stock Units			Total Stock Units			Weighted Average Grant Date Fair Value per Unit
Non-vested at December 31, 2021		505,905			474,166			980,071		$	30.79
Granted		247,760			151,236			398,996		$	35.92
Performance share adjustment		0			2,491			2,491		$	14.20
Vested		(193,462	)		(256,956	)		(450,418	)	$	34.47
Forfeited		(25,344	)		(8,848	)		(34,192	)	$	28.19
Non-vested at September 30, 2022		534,859			362,089			896,948		$	31.28

Summary of Status and Activity of Stock Options

The following table shows a summary of the status and activity of stock options for the nine months ended September 30, 2022:


	Options			Weighted Average Exercise Price per Option		Weighted Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value (in millions)
Outstanding at December 31, 2021		1,054,166		$	26.89
Granted		98,108		$	32.19
Expired		(30,138	)	$	38.21
Outstanding at September 30, 2022		1,122,136		$	27.05		4.87	$	1.3
Exercisable at September 30, 2022		843,475		$	26.99		3.77	$	1.2

Schedule of Stock-based Compensation Expense Recognized

Total stock-based compensation expense recognized under our LTIP and employee stock purchase plan for the three and nine months ended September 30, 2022 and 2021 is as follows:


	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
(Dollars in millions)
Stock-based compensation expense recognized:
Selling, general and administrative expenses	$	3.2	$	3.2	$	10.0	$	9.8
Less related income tax benefit		1.2		0.8		3.6		2.6
Decrease in net income attributable to Koppers	$	2.0	$	2.4	$	6.4	$	7.2
Intrinsic value of exercised stock options	$	0.0	$	0.0	$	0.0	$	2.2
Cash received from the exercise of stock options	$	0.0	$	0.0	$	0.0	$	2.3

Performance Stock Units [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Stock Options And Performance Award Fair Value Assumptions

We calculated the fair value of the performance stock unit awards on the date of grant using the assumptions listed below:


	January 2022 Grant			January 2021 Grant			March 2020 Grant
Grant date price per share of performance award	$	32.19		$	29.84		$	19.63
Expected dividend yield per share		0.00	%		0.00	%		0.00	%
Expected volatility		66.90	%		68.70	%		45.60	%
Risk-free interest rate		1.10	%		0.16	%		0.72	%
Look-back period in years		3.00			3.00			2.83
Grant date fair value per share	$	45.19		$	41.50		$	11.56

Segment Information (Tables)

9 Months Ended

Sep. 30, 2022

Segment Reporting [Abstract]

Summary of Results of Segment Operations

The following table sets forth certain sales and operating data, net of all intersegment transactions, for our segments for the periods indicated:


	Three Months Ended September 30,						Nine Months Ended September 30,
	2022			2021			2022			2021
(Dollars in millions)
Revenues from external customers:
Railroad and Utility Products and Services	$	207.7		$	186.9		$	595.3		$	574.3
Performance Chemicals		153.1			115.2			439.1			384.4
Carbon Materials and Chemicals		175.3			122.7			463.5			314.6
Total	$	536.1		$	424.8		$	1,497.9		$	1,273.3
Intersegment revenues:
Performance Chemicals	$	6.8		$	3.9		$	16.7		$	11.2
Carbon Materials and Chemicals		19.9			18.9			57.4			55.2
Total	$	26.7		$	22.8		$	74.1		$	66.4
Depreciation and amortization expense:
Railroad and Utility Products and Services	$	5.6		$	5.3		$	16.5		$	16.9
Performance Chemicals		3.8			4.1			11.5			13.6
Carbon Materials and Chemicals		7.5			4.0			16.5			12.9
Total	$	16.9		$	13.4		$	44.5		$	43.4
Adjusted EBITDA:
Railroad and Utility Products and Services	$	15.5		$	10.7		$	40.3		$	39.1
Performance Chemicals		16.7			20.2			57.9			82.5
Carbon Materials and Chemicals		36.6			22.5			77.8			51.5
Items excluded from the determination of segment profit:
Impairment, restructuring and plant closure (costs) benefits		(0.3	)		0.7			(0.2	)		(4.3	)
Gain on sale of assets		0.0			0.0			2.5			7.8
LIFO expense		(6.1	)		(10.6	)		(12.9	)		(15.8	)
Mark-to-market commodity hedging losses		(1.9	)		(4.4	)		(9.0	)		(2.8	)
Corporate unallocated		0.0			0.5			0.0			1.6
Interest expense		(11.4	)		(10.2	)		(32.3	)		(30.5	)
Depreciation and amortization		(16.9	)		(14.1	)		(44.5	)		(44.1	)
Income tax provision		(13.2	)		(4.8	)		(29.7	)		(22.4	)
Discontinued operations		0.0			(0.5	)		(0.5	)		0.1
Net income	$	19.0		$	10.0		$	49.4		$	62.7

Schedule of Segment Revenues for Significant Product Lines

The following table sets forth revenues for significant product lines, net of all intersegment transactions, for our segments for the periods indicated:


	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
(Dollars in millions)
Railroad and Utility Products and Services:
Railroad treated products	$	120.6	$	107.1	$	348.2	$	327.6
Utility poles		63.0		59.6		178.7		186.2
Railroad infrastructure services		10.9		8.8		29.9		25.3
Rail joints		7.8		5.7		21.6		17.9
Other products		5.4		5.7		16.9		17.3
Total		207.7		186.9		595.3		574.3
Performance Chemicals:
Wood preservative products		148.3		110.1		419.2		366.4
Other products		4.8		5.1		19.9		18.0
Total		153.1		115.2		439.1		384.4
Carbon Materials and Chemicals:
Pitch and related products		109.6		70.4		270.0		177.7
Phthalic anhydride and other chemicals		31.6		19.7		85.0		52.2
Creosote and distillates		17.2		19.0		56.9		48.6
Naphthalene		9.1		6.2		26.1		15.5
Other products		7.8		7.4		25.5		20.6
Total		175.3		122.7		463.5		314.6
Total	$	536.1	$	424.8	$	1,497.9	$	1,273.3

Summary of Tangible and Intangible Assets by Segments

The following table sets forth assets and goodwill allocated to each of our segments as of the dates indicated:


	September 30, 2022		December 31, 2021
(Dollars in millions)
Segment assets:
Railroad and Utility Products and Services	$	620.9	$	594.1
Performance Chemicals		516.3		586.9
Carbon Materials and Chemicals		487.6		447.1
All other		27.9		33.8
Total	$	1,652.7	$	1,661.9
Goodwill:
Railroad and Utility Products and Services	$	120.4	$	120.9
Performance Chemicals		171.6		175.1
Total	$	292.0	$	296.0

Income Taxes (Tables)

9 Months Ended

Sep. 30, 2022

Income Tax Disclosure [Abstract]

Summary of Income Taxes Reconciled with Federal Statutory Rate

The estimated annual effective income tax rate differs from the U.S. federal statutory tax rate due to:


	September 30,
	2022			2021
Federal income tax rate		21.0	%		21.0	%
Foreign earnings taxed at different rates		6.8			3.6
Interest expense deduction limitation		5.9			0.0
Nondeductible expenses		1.6			1.3
State income taxes, net of federal tax benefit		0.6			0.8
Change in tax contingency reserves		0.1			0.1
GILTI inclusion, net of foreign tax credits		0.1			0.0
Estimated annual effective income tax rate		36.1	%		26.8	%

Inventories (Tables)

9 Months Ended

Sep. 30, 2022

Inventory Disclosure [Abstract]

Components of Net Inventories

Net inventories as of September 30, 2022 and December 31, 2021 are summarized in the table below:


	September 30, 2022		December 31, 2021
(Dollars in millions)
Raw materials	$	264.1	$	266.8
Work in process		11.5		12.6
Finished goods		120.9		112.1
	$	396.5	$	391.5
Less revaluation to LIFO		90.5		77.7
Net	$	306.0	$	313.8

Property, Plant and Equipment (Tables)

9 Months Ended

Sep. 30, 2022

Property Plant And Equipment [Abstract]

Property, Plant and Equipment

Property, plant and equipment as of September 30, 2022 and December 31, 2021 are summarized in the table below:


	September 30, 2022		December 31, 2021
(Dollars in millions)
Land	$	13.7	$	15.2
Buildings		73.1		75.8
Machinery and equipment		888.9		836.8
	$	975.7	$	927.8
Less accumulated depreciation		448.5		438.7
Net	$	527.2	$	489.1

Pensions and Post-Retirement Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2022

Compensation And Retirement Disclosure [Abstract]

Components of Net Periodic Benefit Cost for Pension Plans

The following table provides the components of net periodic benefit cost for the pension plans for the three and nine months ended September 30, 2022 and 2021:


	Three Months Ended September 30,						Nine Months Ended September 30,
	2022			2021			2022			2021
(Dollars in millions)
Service cost	$	0.3		$	0.4		$	0.9		$	1.1
Interest cost		1.4			1.1			4.3			3.8
Expected return on plan assets		(1.9	)		(1.8	)		(5.8	)		(5.5	)
Amortization of net loss		0.4			0.4			1.3			1.1
Net periodic benefit cost	$	0.2		$	0.1		$	0.7		$	0.5
Defined contribution plan expense	$	2.2		$	1.9		$	7.0		$	6.5

Debt (Tables)

9 Months Ended

Sep. 30, 2022

Debt Disclosure [Abstract]

Schedule of Long-Term Debt Instruments

Debt as of September 30, 2022 and December 31, 2021 was as follows:


	Weighted Average Interest Rate			Maturity	September 30, 2022		December 31, 2021
(Dollars in millions)
Term Loan		2.38	%	─	$	0.0	$	2.0
Revolving Credit Facility		2.38	%	─		0.0		287.1
Revolving Credit Facility		5.16	%	2027		326.8		0.0
Senior Notes due 2025		6.00	%	2025		500.0		500.0
Debt						826.8		789.1
Less short-term debt and current maturities of long-term debt						0.0		2.0
Less unamortized debt issuance costs						8.1		5.6
Long-term debt					$	818.7	$	781.5

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04(a))
-URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e24072-122690

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
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-URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21506-112644

Reference 5: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 55
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-URI https://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612

Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
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-Section 45
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399

Reference 7: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
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-Section 55
-Paragraph 69E
-URI https://asc.fasb.org/extlink&oid=123466577&loc=SL123495743-112612

Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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-Section 50
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-URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21521-112644

Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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+ Details

Asset Retirement Obligations (Tables)

9 Months Ended

Sep. 30, 2022

Asset Retirement Obligation Disclosure [Abstract]

Schedule of Changes in Carrying Values of Asset Retirement Obligations

The following table reflects changes in the carrying values of asset retirement obligations:


	September 30, 2022			December 31, 2021
(Dollars in millions)
Asset retirement obligation at beginning of year	$	13.2		$	19.8
Accretion expense		0.8			1.0
Revision in estimated cash flows		3.3			(0.3	)
Cash expenditures		(0.6	)		(7.3	)
Currency translation		(0.2	)		0.0
Balance at end of period	$	16.5		$	13.2

Leases (Tables)

9 Months Ended

Sep. 30, 2022

Leases [Abstract]

Summary of Amount and Timing of Cash Flows From Operating Leases

The following table presents information about the amount and timing of cash flows arising from our operating leases as of September 30, 2022:


(Dollars in millions)
2022	$	7.0
2023		23.7
2024		19.9
2025		16.2
2026		11.9
Thereafter		29.5
Total lease payments	$	108.2
Less: Interest		(22.6	)
Present value of lease liabilities	$	85.6

Schedule of Supplemental Condensed Consolidated Balance Sheet Information Related to Leases

Supplemental condensed consolidated balance sheet information related to leases is as follows:


	September 30,			December 31,
	2022			2021
(Dollars in millions)
Operating leases:
Operating lease right-of-use assets	$	84.6		$	91.2
Current operating lease liabilities	$	19.4		$	21.3
Operating lease liabilities		66.2			70.3
Total operating lease liabilities	$	85.6		$	91.6
Weighted average remaining lease term, in years		5.7			5.8
Weighted average discount rate		7.3	%		7.4	%

Derivative Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2022

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Schedule of Outstanding Copper Swap Contracts

As of September 30, 2022 and December 31, 2021, we had outstanding copper swap contracts of the following amounts:


	Units Outstanding (in Pounds)				Net Fair Value - Asset (in Dollars)
	September 30, 2022		December 31, 2021		September 30, 2022			December 31, 2021
(Amounts in millions)
Cash flow hedges		12.1		29.0	$	4.4		$	53.8
Contracts where hedge accounting was not elected		7.6		6.1		(2.0	)		7.1
Total		19.7		35.1	$	2.4		$	60.9

Schedule of Fair Value of Outstanding Copper Swap Contracts Recorded in Balance Sheet

As of September 30, 2022 and December 31, 2021, the fair value of the outstanding copper swap contracts is recorded in the balance sheet as follows:


	September 30, 2022			December 31, 2021
(Dollars in millions)
Derivative contracts	$	3.4		$	60.9
Accrued liabilities		(0.4	)		0.0
Other long-term liabilities		(0.6	)		0.0
Net asset on balance sheet	$	2.4		$	60.9
Accumulated other comprehensive gain, net of tax	$	3.7		$	40.6

Schedule of Unrealized Gain (Loss) from Contract Where Hedge Accounting Was Not Elected

For the three and nine months ended September 30, 2022 and 2021, the unrealized (loss) gain from contracts where hedge accounting was not elected is as follows:


	Three Months Ended September 30,						Nine Months Ended September 30,
	2022			2021			2022			2021
(Dollars in millions)
(Loss) from contracts where hedge accounting was not elected		(1.9	)		(4.4	)		(9.0	)		(2.7	)

Schedule of Fair Value of Outstanding Foreign Currency Forward Contracts

As of September 30, 2022 and December 31, 2021, the fair value of outstanding foreign currency forward contracts is recorded in the balance sheet as follows:


	September 30, 2022			December 31, 2021
(Dollars in millions)
Derivative contracts	$	0.0		$	0.1
Accrued liabilities		(0.8	)		(0.4	)
Net liability on balance sheet	$	(0.8	)	$	(0.3	)

Summary of Net Currency Units Outstanding

As of September 30, 2022 and December 31, 2021, the net currency units outstanding for these contracts were:


	September 30, 2022		December 31, 2021
(In millions)
United States Dollars		USD 11.7		USD 21.4

Commitments and Contingent Liabilities (Tables)

9 Months Ended

Sep. 30, 2022

Commitments And Contingencies Disclosure [Abstract]

Changes in Accrued Liability for Environmental Matters

The following table reflects changes in the accrual for environmental remediation. A total of $2.4 million and $2.8 million are classified as current liabilities as of September 30, 2022 and December 31, 2021:


	Period ended
	September 30, 2022			December 31, 2021
(Dollars in millions)
Balance at beginning of year	$	10.7		$	11.0
Expense		0.4			0.3
Reversal of reserves		0.0			(0.1	)
Cash expenditures		(0.7	)		(0.4	)
Currency translation		(0.3	)		(0.1	)
Balance at end of period	$	10.1		$	10.7

Plant Closure and Divestitures - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended			3 Months Ended			9 Months Ended
	Mar. 31, 2022	Oct. 31, 2021	Feb. 28, 2021	Sep. 30, 2022	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Restructuring Cost and Reserve [Line Items]
Gain on sale				$ (0.0)	$ (0.0)		$ 2.5	$ 7.8
Railroad and Utility Products and Services [Member] \| Facility [Member]
Restructuring Cost and Reserve [Line Items]
Gain on sale		$ 23.4
West Virginia [Member] \| Coal Tar Distillation [Member]
Restructuring Cost and Reserve [Line Items]
Gain on sale			$ 5.7
Cash proceed from sale			$ 2.6
Pennsylvania [Member] \| Coal Tar Distillation [Member]
Restructuring Cost and Reserve [Line Items]
Gain on sale						$ 1.8
Sweetwater, Tennessee [Member] \| Railroad and Utility Products and Services [Member] \| Pole Treating Facility [Member]
Restructuring Cost and Reserve [Line Items]
Gain on sale	$ 2.5

Discontinued Operations - Additional Information (Detail) - USD ($) $ in Millions		3 Months Ended	9 Months Ended
	Dec. 23, 2021	Sep. 30, 2022	Sep. 30, 2022	Aug. 31, 2022	Sep. 30, 2020
Schedule Of Equity Method Investments [Line Items]
Restricted cash held with escrow				$ 1.5
Potential customary indemnity claims settled period			2022-04
Potential customary indemnity claims issued	$ 0.9		$ 0.9
Potential customary indemnity claims shares issued	$ 0.7		$ 0.7
Potential customary indemnity claims tax amount		$ 0.5
Koppers (Jiangsu) Carbon Chemical Company Limited [Member] \| Carbon Materials and Chemicals [Member]
Schedule Of Equity Method Investments [Line Items]
Ownership percentage					75.00%

Fair Value Measurements - Schedule of Company's Financial Instruments (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Fair Value [Member]
Financial assets:
Investments and other assets	$ 1.3	$ 1.3
Financial liabilities:
Long-term debt (including current portion)	789.3	804.1
Carrying Value [Member]
Financial assets:
Investments and other assets	1.3	1.3
Financial liabilities:
Long-term debt (including current portion)	$ 826.8	$ 789.1

Comprehensive (Loss) Income and Equity - Schedule of Comprehensive (Loss) Income (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Equity [Abstract]
Net income	$ 19.0	$ 10.0	$ 49.4	$ 62.7
Changes in other comprehensive (loss) income:
Currency translation adjustment	(20.1)	(11.1)	(40.7)	(14.5)
Unrealized (loss) on cash flow hedges, net of tax benefit of $4.9, $6.1, $21.1 and $1.2	(8.7)	(16.6)	(37.4)	(3.3)
Unrecognized pension net loss, net of tax expense of $0.1, $0.1, $0.2 and $0.3	0.3	0.3	1.0	0.8
Total comprehensive (loss) income	(9.5)	(17.4)	(27.7)	45.7
Comprehensive loss attributable to noncontrolling interests	(0.4)	(0.2)	(0.6)	(0.2)
Comprehensive (loss) income attributable to Koppers	$ (9.1)	$ (17.2)	$ (27.1)	$ 45.9

- Definition

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income (loss) and other comprehensive income (loss), attributable to noncontrolling interests. Excludes changes in equity resulting from investments by owners and distributions to owners.

+ References + Details

- Definition

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. Excludes changes in equity resulting from investments by owners and distributions to owners.

+ References + Details

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

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+ Details

Comprehensive (Loss) Income and Equity - Schedule of Comprehensive (Loss) Income (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Equity [Abstract]
Tax benefit, unrealized (loss) on cash flow hedges	$ 4.9	$ 6.1	$ 21.1	$ 1.2
Tax expense, unrecognized pension net loss	$ 0.1	$ 0.1	$ 0.2	$ 0.3

Comprehensive (Loss) Income and Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		9 Months Ended
	Nov. 03, 2022	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Accumulated Other Comprehensive Income Loss [Line Items]
Loss related to derivative instrument		$ 5.8	$ 11.1	$ 27.0	$ 31.0
Subsequent Event [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Quarterly dividend declared per common share	$ 0.05
Quarterly dividend, declared date	Nov. 03, 2022
Quarterly dividend, payable date	Dec. 12, 2022
Quarterly dividend, payable date of record	Nov. 25, 2022

Comprehensive (Loss) Income and Equity - Schedule of Change in Equity (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	$ 379.2	$ 416.1	$ 410.8	$ 346.0	$ 346.0
Net income (loss)	19.0	10.0	49.4	62.7
Dividends	(1.0)		(3.2)
Issuance of common stock	0.3	0.3	0.9	2.2
Repurchases of common stock		(1.4)	(18.5)	(3.3)
Employee stock plans	3.2	3.3	10.1	9.9
Other comprehensive (loss) income
Currency translation adjustment	(19.9)	(11.4)	(40.8)	(10.1)
Cumulative translation adjustment loss on sale of subsidiary				(4.4)
Unrealized loss on cash flow hedges	(8.7)	(16.6)	(37.4)	(3.3)
Unrecognized pension net loss	0.3	0.3	1.0	0.8
Balance	372.4	400.5	372.4	400.5	410.8
Common Stock [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	0.2	0.2	0.2	0.2	0.2
Net income (loss)	0.0	0.0	0.0	0.0
Dividends	0.0		0.0
Issuance of common stock	0.0	0.0	0.0	0.0
Repurchases of common stock		0.0	0.0	0.0
Employee stock plans	0.0	0.0	0.0	0.0
Other comprehensive (loss) income
Currency translation adjustment	0.0	0.0	0.0	0.0
Cumulative translation adjustment loss on sale of subsidiary				0.0
Unrealized loss on cash flow hedges	0.0	0.0	0.0	0.0
Unrecognized pension net loss	0.0	0.0	0.0	0.0
Balance	0.2	0.2	0.2	0.2	0.2
Additional Paid-In Capital [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	257.0	242.7	249.5	234.1	234.1
Net income (loss)	0.0	0.0	0.0	0.0
Dividends	0.0		0.0
Issuance of common stock	0.3	0.3	0.9	2.2
Repurchases of common stock		0.0	0.0	0.0
Employee stock plans	3.2	3.3	10.1	9.9
Other comprehensive (loss) income
Currency translation adjustment	0.0	0.0	0.0	0.0
Cumulative translation adjustment loss on sale of subsidiary				0.0
Unrealized loss on cash flow hedges	0.0	0.0	0.0	0.0
Unrecognized pension net loss	0.0	0.0	0.0	0.0
Balance	260.5	246.2	260.5	246.2	249.5
Retained Earnings [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	329.3	268.8	300.9	215.8	215.8
Net income (loss)	19.1	10.2	49.6	63.0
Dividends	(1.0)		(3.2)
Issuance of common stock	0.0	0.0	0.0	0.0
Repurchases of common stock		0.0	0.0	0.0
Employee stock plans	0.0	0.0	0.0	0.0
Other comprehensive (loss) income
Currency translation adjustment	0.0	(0.3)	0.0	0.0
Cumulative translation adjustment loss on sale of subsidiary				0.0
Unrealized loss on cash flow hedges	0.0	0.0	0.0	0.0
Unrecognized pension net loss	0.0	0.0	0.0	0.0
Balance	347.4	278.8	347.4	278.8	300.9
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	(88.7)	(5.5)	(40.0)	(15.9)	(15.9)
Net income (loss)	0.0	0.0	0.0	0.0
Dividends	0.0		0.0
Issuance of common stock	0.0	0.0	0.0	0.0
Repurchases of common stock		0.0	0.0	0.0
Employee stock plans	0.0	0.0	0.0	0.0
Other comprehensive (loss) income
Currency translation adjustment	(19.6)	(11.1)	(40.2)	(10.2)
Cumulative translation adjustment loss on sale of subsidiary				(4.4)
Unrealized loss on cash flow hedges	(8.7)	(16.6)	(37.4)	(3.3)
Unrecognized pension net loss	0.3	0.3	1.0	0.8
Balance	(116.7)	(33.0)	(116.7)	(33.0)	(40.0)
Treasury Stock [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	(122.5)	(94.4)	(104.0)	(92.5)	(92.5)
Net income (loss)	0.0	0.0	0.0	0.0
Dividends	0.0		0.0
Issuance of common stock	0.0	0.0	0.0	0.0
Repurchases of common stock		(1.4)	(18.5)	(3.3)
Employee stock plans	0.0	0.0	0.0	0.0
Other comprehensive (loss) income
Currency translation adjustment	0.0	0.0	0.0	0.0
Cumulative translation adjustment loss on sale of subsidiary				0.0
Unrealized loss on cash flow hedges	0.0	0.0	0.0	0.0
Unrecognized pension net loss	0.0	0.0	0.0	0.0
Balance	(122.5)	(95.8)	(122.5)	(95.8)	(104.0)
Noncontrolling Interests [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	3.9	4.3	4.2	4.3	4.3
Net income (loss)	(0.1)	(0.2)	(0.2)	(0.3)
Dividends	0.0		0.0
Issuance of common stock	0.0	0.0	0.0	0.0
Repurchases of common stock		0.0	0.0	0.0
Employee stock plans	0.0	0.0	0.0	0.0
Other comprehensive (loss) income
Currency translation adjustment	(0.3)	0.0	(0.6)	0.1
Cumulative translation adjustment loss on sale of subsidiary				0.0
Unrealized loss on cash flow hedges	0.0	0.0	0.0	0.0
Unrecognized pension net loss	0.0	0.0	0.0	0.0
Balance	$ 3.5	$ 4.1	$ 3.5	$ 4.1	$ 4.2

Earnings per Common Share - Schedule of Computation of Basic and Diluted Earnings per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Net income attributable to Koppers	$ 19.1	$ 10.2	$ 49.6	$ 63.0
Less: (Gain) loss on sale of discontinued operations, net of tax of $0.0	0.0	(0.5)	(0.5)	0.1
Income from continuing operations attributable to Koppers	$ 19.1	$ 10.7	$ 50.1	$ 62.9
Weighted average common shares outstanding:
Basic	20,897	21,322	21,024	21,253
Effect of dilutive securities	188	625	321	696
Diluted	21,085	21,947	21,345	21,949
Earnings per common share – continuing operations:
Basic earnings per common share	$ 0.91	$ 0.50	$ 2.38	$ 2.96
Diluted earnings per common share	$ 0.91	$ 0.49	$ 2.35	$ 2.87
Other data:
Antidilutive securities excluded from computation of diluted earnings per common share	1,088	563	1,075	437

Earnings per Common Share - Schedule of Computation of Basic and Diluted Earnings per Common Share (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Gain (loss) on sale of discontinued operations, tax	$ 0.0	$ 0.0	$ 0.0	$ 0.0

Stock-based Compensation - Additional Information (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2022 USD ($) shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Future compensation expense related to non-vested stock-based compensation arrangements \| $	$ 21.6
Future compensation expense, weighted-average expected period of recognition in months	27 months
Restricted Stock Units (RSUs) [Member] \| Board of Directors [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based awards, vesting period	1 year
Restricted Stock Units (RSUs) [Member] \| Employee [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based awards, vesting period	4 years
Restricted Stock Units (RSUs) [Member] \| Employee [Member] \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based awards, vesting period	2 years
Performance Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting performance stock units if minimum performance criteria are not achieved \| shares	0
Stock options, term in years	3 years
Performance Stock Units [Member] \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of target award earned by participants	200.00%
Performance Stock Units [Member] \| Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of target award earned by participants	0.00%
Employee Stock Option [Member] \| Grants in March 2015 and Thereafter [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options, term in years	10 years
Employee Stock Option [Member] \| Executive Officer [Member] \| Grants in March 2015 and Thereafter [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based awards, vesting period	4 years

Stock-based Compensation - Performance Award Fair Value Assumptions (Detail)	9 Months Ended
	Sep. 30, 2022 $ / shares
January 2022 Grant [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Grant date price per share of performance award	$ 32.19
Expected dividend yield per share	0.00%
Expected volatility	54.50%
Risk-free interest rate	1.52%
Grant date fair value per share	$ 17.58
January 2022 Grant [Member] \| Performance Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Grant date price per share of performance award	$ 32.19
Expected dividend yield per share	0.00%
Expected volatility	66.90%
Risk-free interest rate	1.10%
Look-back period in years	3 years
Grant date fair value per share	$ 45.19
January 2021 Grant [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Grant date price per share of performance award	$ 29.84
Expected dividend yield per share	0.00%
Expected volatility	54.80%
Risk-free interest rate	0.59%
Grant date fair value per share	$ 15.79
January 2021 Grant [Member] \| Performance Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Grant date price per share of performance award	$ 29.84
Expected dividend yield per share	0.00%
Expected volatility	68.70%
Risk-free interest rate	0.16%
Look-back period in years	3 years
Grant date fair value per share	$ 41.50
March 2020 Grant [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Grant date price per share of performance award	$ 19.63
Expected dividend yield per share	0.00%
Expected volatility	42.85%
Risk-free interest rate	0.87%
Grant date fair value per share	$ 8.42
March 2020 Grant [Member] \| Performance Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Grant date price per share of performance award	$ 19.63
Expected dividend yield per share	0.00%
Expected volatility	45.60%
Risk-free interest rate	0.72%
Look-back period in years	2 years 9 months 29 days
Grant date fair value per share	$ 11.56

Stock-based Compensation - Summary of Performance Stock Units (Detail) - shares	Sep. 30, 2022	Dec. 31, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares outstanding	896,948	980,071
Performance Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares outstanding	362,089	474,166
2020 - 2022 [Member] \| Minimum [Member] \| Performance Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares outstanding	0
2020 - 2022 [Member] \| Target Shares [Member] \| Performance Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares outstanding	74,259
2020 - 2022 [Member] \| Maximum [Member] \| Performance Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares outstanding	148,563
2021 - 2023 [Member] \| Minimum [Member] \| Performance Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares outstanding	40,751
2021 - 2023 [Member] \| Target Shares [Member] \| Performance Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares outstanding	137,936
2021 - 2023 [Member] \| Maximum [Member] \| Performance Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares outstanding	235,138
2022 - 2024 [Member] \| Minimum [Member] \| Performance Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares outstanding	0
2022 - 2024 [Member] \| Target Shares [Member] \| Performance Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares outstanding	149,892
2022 - 2024 [Member] \| Maximum [Member] \| Performance Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares outstanding	299,784

Stock-based Compensation - Summary of Status and Activity of Non-Vested Stock Units (Detail)	9 Months Ended
	Sep. 30, 2022 $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Non-vested, Beginning Balance	980,071
Granted	398,996
Performance share adjustment	2,491
Vested	(450,418)
Forfeited	(34,192)
Non-vested, Ending Balance	896,948
Beginning Balance, Non-vested, Weighted Average Grant Date Fair Value per Unit \| $ / shares	$ 30.79
Granted, Weighted Average Grant Date Fair Value per Unit \| $ / shares	35.92
Performance share adjustment, Weighted Average Grant Date Fair Value per Unit \| $ / shares	14.20
Vested, Weighted Average Grant Date Fair Value per Unit \| $ / shares	34.47
Forfeited, Weighted Average Grant Date Fair Value per Unit \| $ / shares	28.19
Ending Balance, Non-vested, Weighted Average Grant Date Fair Value per Unit \| $ / shares	$ 31.28
Restricted Stock Units (RSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Non-vested, Beginning Balance	505,905
Granted	247,760
Performance share adjustment	0
Vested	(193,462)
Forfeited	(25,344)
Non-vested, Ending Balance	534,859
Performance Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Non-vested, Beginning Balance	474,166
Granted	151,236
Performance share adjustment	2,491
Vested	(256,956)
Forfeited	(8,848)
Non-vested, Ending Balance	362,089

Stock-based Compensation - Stock Options Fair Value Assumptions (Detail)	9 Months Ended
	Sep. 30, 2022 $ / shares
January 2022 Grant [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Grant date price per share of stock option award	$ 32.19
Expected dividend yield per share	0.00%
Expected life in years	6 years 9 months 3 days
Expected volatility	54.50%
Risk-free interest rate	1.52%
Grant date fair value per share of option awards	$ 17.58
January 2021 Grant [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Grant date price per share of stock option award	$ 29.84
Expected dividend yield per share	0.00%
Expected life in years	6 years 7 months 20 days
Expected volatility	54.80%
Risk-free interest rate	0.59%
Grant date fair value per share of option awards	$ 15.79
March 2020 Grant [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Grant date price per share of stock option award	$ 19.63
Expected dividend yield per share	0.00%
Expected life in years	6 years 4 months 24 days
Expected volatility	42.85%
Risk-free interest rate	0.87%
Grant date fair value per share of option awards	$ 8.42
March 2019 Grant [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Grant date price per share of stock option award	$ 26.63
Expected dividend yield per share	0.00%
Expected life in years	6 years 1 month 20 days
Expected volatility	39.44%
Risk-free interest rate	2.53%
Grant date fair value per share of option awards	$ 11.29

Stock-based Compensation - Summary of Status and Activity of Stock Options (Detail) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2022 USD ($) $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Options, Outstanding at December 31, 2021 \| shares	1,054,166
Options, Granted \| shares	98,108
Options, Expired \| shares	(30,138)
Options, Outstanding at September 30, 2022 \| shares	1,122,136
Options, Exercisable at September 30, 2022 \| shares	843,475
Weighted Average Exercise Price per Option, Outstanding at December 31, 2021 \| $ / shares	$ 26.89
Weighted Average Exercise Price per Option, Granted \| $ / shares	32.19
Weighted Average Exercise Price per Option, Expired \| $ / shares	38.21
Weighted Average Exercise Price per Option, Outstanding at September 30, 2022 \| $ / shares	27.05
Weighted Average Exercise Price per Option, Exercisable at September 30, 2022 \| $ / shares	$ 26.99
Weighted Average Remaining Contractual Term, Outstanding at September 30, 2022	4 years 10 months 13 days
Weighted Average Remaining Contractual Term, Exercisable at September 30, 2022	3 years 9 months 7 days
Aggregate Intrinsic Value, Outstanding at September 30, 2022 \| $	$ 1.3
Aggregate Intrinsic Value, Exercisable at September 30, 2022 \| $	$ 1.2

Stock-based Compensation - Schedule of Stock-Based Compensation Expense Recognized (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Stock-based compensation expense recognized:
Less related income tax benefit	$ 1.2	$ 0.8	$ 3.6	$ 2.6
Decrease in net income attributable to Koppers	2.0	2.4	6.4	7.2
Intrinsic value of exercised stock options	0.0	0.0	0.0	2.2
Cash received from the exercise of stock options	0.0	0.0	0.0	2.3
Selling, General and Administrative Expenses [Member]
Stock-based compensation expense recognized:
Stock-based compensation expense	$ 3.2	$ 3.2	$ 10.0	$ 9.8

Segment Information - Additional Information (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2022 USD ($) Segment	Dec. 31, 2021 USD ($)
Segment Reporting [Abstract]
Number of reportable segments \| Segment	3
Contract with customer, asset, net, current \| $	$ 8.4	$ 7.9

Segment Information - Summary of Results of Segment Operations (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenues from external customers
Net sales	$ 536.1	$ 424.8	$ 1,497.9	$ 1,273.3
Depreciation and amortization expense	16.9	13.4	44.5	43.4
Items excluded from the determination of segment profit:
Impairment, restructuring and plant closure (costs) benefits	(0.3)	0.7	(0.2)	(4.3)
Gain on sale of assets	(0.0)	(0.0)	2.5	7.8
LIFO expense	(6.1)	(10.6)	(12.9)	(15.8)
Mark-to-market commodity hedging losses	(1.9)	(4.4)	(9.0)	(2.8)
Interest expense	(11.4)	(10.2)	(32.3)	(30.5)
Income tax provision	(13.2)	(4.8)	(29.7)	(22.4)
Depreciation and amortization	(16.9)	(14.1)	(44.5)	(44.1)
Discontinued operations	0.0	(0.5)	(0.5)	0.1
Net income	19.0	10.0	49.4	62.7
Railroad and Utility Products and Services [Member]
Revenues from external customers
Net sales	207.7	186.9	595.3	574.3
Performance Chemicals [Member]
Revenues from external customers
Net sales	153.1	115.2	439.1	384.4
Carbon Materials and Chemicals [Member]
Revenues from external customers
Net sales	175.3	122.7	463.5	314.6
Operating Segments [Member] \| Railroad and Utility Products and Services [Member]
Revenues from external customers
Net sales	207.7	186.9	595.3	574.3
Depreciation and amortization expense	5.6	5.3	16.5	16.9
Adjusted EBITDA:
Adjusted EBITDA	15.5	10.7	40.3	39.1
Operating Segments [Member] \| Performance Chemicals [Member]
Revenues from external customers
Net sales	153.1	115.2	439.1	384.4
Depreciation and amortization expense	3.8	4.1	11.5	13.6
Adjusted EBITDA:
Adjusted EBITDA	16.7	20.2	57.9	82.5
Operating Segments [Member] \| Carbon Materials and Chemicals [Member]
Revenues from external customers
Net sales	175.3	122.7	463.5	314.6
Depreciation and amortization expense	7.5	4.0	16.5	12.9
Adjusted EBITDA:
Adjusted EBITDA	36.6	22.5	77.8	51.5
Intersegment [Member]
Revenues from external customers
Net sales	26.7	22.8	74.1	66.4
Intersegment [Member] \| Performance Chemicals [Member]
Revenues from external customers
Net sales	6.8	3.9	16.7	11.2
Intersegment [Member] \| Carbon Materials and Chemicals [Member]
Revenues from external customers
Net sales	19.9	18.9	57.4	55.2
Corporate, Non-Segment [Member]
Items excluded from the determination of segment profit:
Corporate unallocated	$ 0.0	$ 0.5	$ 0.0	$ 1.6

Segment Information - Schedule of Segment Revenues for Significant Product Lines (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Net sales	$ 536.1	$ 424.8	$ 1,497.9	$ 1,273.3
Railroad and Utility Products and Services [Member]
Segment Reporting Information [Line Items]
Net sales	207.7	186.9	595.3	574.3
Railroad and Utility Products and Services [Member] \| Railroad Treated Products [Member]
Segment Reporting Information [Line Items]
Net sales	120.6	107.1	348.2	327.6
Railroad and Utility Products and Services [Member] \| Utility Poles [Member]
Segment Reporting Information [Line Items]
Net sales	63.0	59.6	178.7	186.2
Railroad and Utility Products and Services [Member] \| Railroad Infrastructure Services [Member]
Segment Reporting Information [Line Items]
Net sales	10.9	8.8	29.9	25.3
Railroad and Utility Products and Services [Member] \| Rail Joints [Member]
Segment Reporting Information [Line Items]
Net sales	7.8	5.7	21.6	17.9
Railroad and Utility Products and Services [Member] \| Other Products [Member]
Segment Reporting Information [Line Items]
Net sales	5.4	5.7	16.9	17.3
Performance Chemicals [Member]
Segment Reporting Information [Line Items]
Net sales	153.1	115.2	439.1	384.4
Performance Chemicals [Member] \| Other Products [Member]
Segment Reporting Information [Line Items]
Net sales	4.8	5.1	19.9	18.0
Performance Chemicals [Member] \| Wood Preservative Products [Member]
Segment Reporting Information [Line Items]
Net sales	148.3	110.1	419.2	366.4
Carbon Materials and Chemicals [Member]
Segment Reporting Information [Line Items]
Net sales	175.3	122.7	463.5	314.6
Carbon Materials and Chemicals [Member] \| Other Products [Member]
Segment Reporting Information [Line Items]
Net sales	7.8	7.4	25.5	20.6
Carbon Materials and Chemicals [Member] \| Pitch and Related Products [Member]
Segment Reporting Information [Line Items]
Net sales	109.6	70.4	270.0	177.7
Carbon Materials and Chemicals [Member] \| Phthalic Anhydride and Other Chemicals [Member]
Segment Reporting Information [Line Items]
Net sales	31.6	19.7	85.0	52.2
Carbon Materials and Chemicals [Member] \| Creosote and Distillates [Member]
Segment Reporting Information [Line Items]
Net sales	17.2	19.0	56.9	48.6
Carbon Materials and Chemicals [Member] \| Naphthalene [Member]
Segment Reporting Information [Line Items]
Net sales	$ 9.1	$ 6.2	$ 26.1	$ 15.5

Segment Information - Summary of Tangible and Intangible Assets by Segments (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Segment Reporting Asset Reconciling Item [Line Items]
Assets	$ 1,652.7	$ 1,661.9
Goodwill	292.0	296.0
Railroad and Utility Products and Services [Member] \| Operating Segments [Member]
Segment Reporting Asset Reconciling Item [Line Items]
Assets	620.9	594.1
Goodwill	120.4	120.9
Performance Chemicals [Member] \| Operating Segments [Member]
Segment Reporting Asset Reconciling Item [Line Items]
Assets	516.3	586.9
Goodwill	171.6	175.1
Carbon Materials and Chemicals [Member] \| Operating Segments [Member]
Segment Reporting Asset Reconciling Item [Line Items]
Assets	487.6	447.1
All Other [Member] \| Operating Segments [Member]
Segment Reporting Asset Reconciling Item [Line Items]
Assets	$ 27.9	$ 33.8

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(11))
-URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
-Section 55
-Paragraph 10
-URI https://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(iii)(A))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(iv))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756

Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
-URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=124433192&loc=SL2890621-112765

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(i))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756

Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(ii))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(5))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(iii)(A))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(i))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-SubTopic 10
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-URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

Reference 14: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 15: http://www.xbrl.org/2003/role/disclosureRef
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Reference 16: http://www.xbrl.org/2003/role/disclosureRef
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Reference 17: http://www.xbrl.org/2003/role/disclosureRef
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Reference 18: http://www.xbrl.org/2003/role/disclosureRef
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Reference 19: http://www.xbrl.org/2003/role/disclosureRef
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Reference 20: http://www.xbrl.org/2003/role/disclosureRef
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Reference 22: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References + Details

Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Estimated annual effective income tax rate	36.10%	36.10%	26.80%
Income taxes as a percentage of pretax income	41.00%	37.30%
Percentage of allowable business interest expense deduction from adjusted taxable income		30.00%
Unrecognized tax benefits	$ 1.4	$ 1.4		$ 1.5
Unrecognized tax benefits with impact on the effective tax rate	1.4	1.4		1.5
Accrued interest expense and penalties	$ 0.4	$ 0.4		$ 0.4

Income Taxes - Summary of Income Taxes Reconciled with Federal Statutory Rate (Detail)	3 Months Ended	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2022	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Federal income tax rate		21.00%	21.00%
Foreign earnings taxed at different rates		6.80%	3.60%
Interest expense deduction limitation		5.90%	0.00%
Nondeductible expenses		1.60%	1.30%
State income taxes, net of federal tax benefit		0.60%	0.80%
Change in tax contingency reserves		0.10%	0.10%
GILTI inclusion, net of foreign tax credits		0.10%	0.00%
Estimated annual effective income tax rate	36.10%	36.10%	26.80%

Inventories - Components of Net Inventories (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Inventory Disclosure [Abstract]
Raw materials	$ 264.1	$ 266.8
Work in process	11.5	12.6
Finished goods	120.9	112.1
Inventories, gross	396.5	391.5
Less revaluation to LIFO	90.5	77.7
Net	$ 306.0	$ 313.8

Property, Plant and Equipment - Property, Plant and Equipment (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 975.7	$ 927.8
Less accumulated depreciation	448.5	438.7
Net	527.2	489.1
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	13.7	15.2
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	73.1	75.8
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 888.9	$ 836.8

Pensions and Post-Retirement Benefit Plans - Additional Information (Detail) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2022 USD ($) Plan	Dec. 31, 2021 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Number of domestic non-qualified defined benefit plans \| Plan	3
Premium payment \| $		$ 67.8
Pension settlement loss \| $	$ 22.0
Salaried and Hourly Employees [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of domestic non-qualified defined benefit plans \| Plan	2

Pensions and Post-Retirement Benefit Plans - Components of Net Periodic Benefit Cost for Pension Plans (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Postemployment Benefits [Abstract]
Service cost	$ 0.3	$ 0.4	$ 0.9	$ 1.1
Interest cost	1.4	1.1	4.3	3.8
Expected return on plan assets	(1.9)	(1.8)	(5.8)	(5.5)
Amortization of net loss	0.4	0.4	1.3	1.1
Net periodic benefit cost	0.2	0.1	0.7	0.5
Defined contribution plan expense	$ 2.2	$ 1.9	$ 7.0	$ 6.5

Debt - Schedule of Long-Term Debt Instruments (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Debt	$ 826.8	$ 789.1
Less short-term debt and current maturities of long-term debt	0.0	2.0
Less unamortized debt issuance costs	8.1	5.6
Long-term debt	$ 818.7	781.5
Term Loan [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	2.38%
Debt	$ 0.0	2.0
2.38 percent Revolving Credit Facility [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	2.38%
Debt	$ 0.0	287.1
5.16 percent Revolving Credit Facility [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	5.16%
Debt, Maturity	2027
Debt	$ 326.8	0.0
6.00 percent Senior Notes due 2025 [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	6.00%
Debt, Maturity	2025
Debt	$ 500.0	$ 500.0

Debt - Additional Information (Detail) - USD ($)		1 Months Ended	9 Months Ended
Debt - Additional Information (Detail) - USD ($)	Feb. 15, 2022	Jun. 30, 2022	Sep. 30, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Revolving credit facility		$ 730,000,000.0
Long term debt			$ 826,800,000	$ 789,100,000
Senior Secured Credit Facilities [Member]
Debt Instrument [Line Items]
Letters of credit, amount outstanding			$ 7,800,000
6.00 percent Senior Notes due 2025 [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Senior notes, payment terms			The 2025 Notes pay interest semi-annually in arrears on February 15 and August 15 and will mature on February 15, 2025 unless earlier redeemed or repurchased.
Long term debt			$ 500,000,000.0	$ 500,000,000.0
Debt instrument, redemption price percentage	101.50%
Debt maturity date			Feb. 15, 2025
Revolving Credit Agreement [Member]
Debt Instrument [Line Items]
Revolving credit facility		$ 800,000,000.0
Credit facility maturity date		2027-06
Senior Secured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility		$ 600,000,000.0
Senior Secured Term Loan Facility [Member]
Debt Instrument [Line Items]
Secured term loan		100,000,000.0
Swingline Revolving Credit Facility
Debt Instrument [Line Items]
Revolving credit facility		$ 50,000,000.0
Revolving Credit Facility [Member] \| Senior Secured Credit Facilities [Member]
Debt Instrument [Line Items]
Debt instrument, unused borrowing capacity			$ 400,000,000

Asset Retirement Obligations - Schedule of Changes in Carrying Values of Asset Retirement Obligations (Detail) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Asset Retirement Obligation Disclosure [Abstract]
Asset retirement obligation at beginning of year	$ 13.2	$ 19.8
Accretion expense	0.8	1.0
Revision in estimated cash flows	3.3	(0.3)
Cash expenditures	(0.6)	(7.3)
Currency translation	(0.2)	0.0
Balance at end of period	$ 16.5	$ 13.2

Leases - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Leases [Abstract]
Operating lease costs	$ 7.1	$ 7.5	$ 21.8	$ 22.8
Variable lease costs	$ 0.9	$ 0.8	$ 2.2	$ 2.7

Leases - Summary of Amount and Timing of Cash Flows From Operating Leases (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Leases [Abstract]
2022	$ 7.0
2023	23.7
2024	19.9
2025	16.2
2026	11.9
Thereafter	29.5
Total lease payments	108.2
Less: Interest	(22.6)
Present value of lease liabilities	$ 85.6	$ 91.6

Leases - Schedule of Supplemental Condensed Consolidated Balance Sheet Information Related to Leases (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Operating leases:
Operating lease right-of-use assets	$ 84.6	$ 91.2
Current operating lease liabilities	19.4	21.3
Operating lease liabilities	66.2	70.3
Total operating lease liabilities	$ 85.6	$ 91.6
Weighted average remaining lease term, in years	5 years 8 months 12 days	5 years 9 months 18 days
Weighted average discount rate	7.30%	7.40%

Derivative Financial Instruments - Additional Information (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2022 USD ($)
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Maximum period hedged in cash flow hedge	36 months
Unrealized gains, reclassification period	12 months
Unrealized gains, net of tax, expected to be reclassified from other comprehensive (loss) income into earnings	$ 3.9

Derivative Financial Instruments - Schedule of Outstanding Copper Swap Contracts (Detail) - Copper Swap Contracts [Member] £ in Millions, $ in Millions	Sep. 30, 2022 GBP (£)	Sep. 30, 2022 USD ($)	Dec. 31, 2021 GBP (£)	Dec. 31, 2021 USD ($)
Derivatives Fair Value [Line Items]
Copper Swap Contracts Units Outstanding \| £	£ 19.7		£ 35.1
Net Fair Value - Asset \| $		$ 2.4		$ 60.9
Designated as Hedging Instrument [Member] \| Cash Flow Hedging [Member]
Derivatives Fair Value [Line Items]
Copper Swap Contracts Units Outstanding \| £	12.1		29.0
Net Fair Value - Asset \| $		4.4		53.8
Contracts Where Hedge Accounting Was not Elected [Member]
Derivatives Fair Value [Line Items]
Copper Swap Contracts Units Outstanding \| £	£ 7.6		£ 6.1
Net Fair Value - Asset \| $		$ (2.0)		$ 7.1

Derivative Financial Instruments - Schedule of Fair Value of Outstanding Copper Swap Contracts Recorded in Balance Sheet (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Derivative [Line Items]
Accumulated other comprehensive gain, net of tax	$ (8.7)	$ (16.6)	$ (37.4)	$ (3.3)
Copper Swap Contracts [Member]
Derivative [Line Items]
Net Fair Value - Asset (Liability)	2.4		2.4		$ 60.9
Accumulated other comprehensive gain, net of tax			3.7		40.6
Copper Swap Contracts [Member] \| Accrued Liabilities [Member]
Derivative [Line Items]
Net Fair Value - Asset (Liability)	(0.4)		(0.4)		0.0
Copper Swap Contracts [Member] \| Other long-term liabilities [Member]
Derivative [Line Items]
Net Fair Value - Asset (Liability)	(0.6)		(0.6)		0.0
Copper Swap Contracts [Member] \| Derivative Contracts [Member]
Derivative [Line Items]
Net Fair Value - Asset (Liability)	$ 3.4		$ 3.4		$ 60.9

Derivative Financial Instruments - Schedule of Unrealized Gain (Loss) from Contract Where Hedge Accounting Was Not Elected (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Hedges \| Contracts Where Hedge Accounting Was not Elected [Member]
Derivative [Line Items]
(Loss) gain from contracts where hedge accounting was not elected	$ (1.9)	$ (4.4)	$ (9.0)	$ (2.7)

Derivative Financial Instruments - Schedule of Fair Value of Outstanding Foreign Currency Forward Contracts (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Derivative [Line Items]
Not designated gross derivative liability	$ (0.8)	$ (0.3)
Forward Contracts [Member] \| Accrued Liabilities [Member]
Derivative [Line Items]
Not designated gross derivative liability	(0.8)	(0.4)
Forward Contracts [Member] \| Derivative Contracts [Member]
Derivative [Line Items]
Not designated gross derivative liability	$ 0.0	$ 0.1

Derivative Financial Instruments - Summary of Net Currency Units Outstanding (Detail) - USD ($)	Sep. 30, 2022	Dec. 31, 2021
Offsetting [Abstract]
Net currency units outstanding	$ 11,700,000	$ 21,400,000

Commitments and Contingent Liabilities - Additional Information (Detail)	9 Months Ended	12 Months Ended
	Sep. 30, 2022 USD ($) Case Site Plant State Plaintiff Party	Dec. 31, 2021 USD ($) Case Plaintiff	Dec. 31, 2020 USD ($)
Loss Contingencies [Line Items]
Number of states with new claims filed \| State	2
Number of plaintiffs \| Plaintiff	53	59
Environmental remediation and regulation liability	$ 10,100,000	$ 10,700,000	$ 11,000,000.0
Accrued liability for environmental matters, current	2,400,000	2,800,000
Portland Harbor and Newark Bay CERCLA sites [Member]
Loss Contingencies [Line Items]
Costs of participating in PRP group	$ 3,300,000
Beazer East [Member]
Loss Contingencies [Line Items]
Sites listed on National Priorities List \| Site	1
Compensatory Damages [Member]
Loss Contingencies [Line Items]
Number of cases \| Case	28
Punitive Damages [Member]
Loss Contingencies [Line Items]
Number of cases \| Case	24
Indemnification Agreement [Member] \| Beazer East [Member]
Loss Contingencies [Line Items]
Environmental remediation costs paid by others, per year		$ 6,400,000
Coal Tar Pitch Cases [Member]
Loss Contingencies [Line Items]
Number of cases \| Case	28	31
Reserve for legal proceedings	$ 0
Pennsylvania [Member]
Loss Contingencies [Line Items]
Number of cases \| Case	27
Pennsylvania [Member] \| Coal Tar Pitch Cases [Member]
Loss Contingencies [Line Items]
Number of cases \| Case	27
Tennessee [Member] \| Coal Tar Pitch Cases [Member]
Loss Contingencies [Line Items]
Number of cases \| Case	1
Compensatory damages	$ 15,000,000.0
Oregon [Member]
Loss Contingencies [Line Items]
Number of potential responsible parties \| Party	80
Net present value of selected remedy estimation	$ 1,100,000,000
Undiscounted cost of selected remedy estimation	1,700,000,000
United States [Member]
Loss Contingencies [Line Items]
Environmental remediation and regulation liability	$ 3,900,000
United States [Member] \| Performance Chemicals [Member]
Loss Contingencies [Line Items]
Number of plant sites \| Plant	2
United States [Member] \| Utility and Industrial Products [Member]
Loss Contingencies [Line Items]
Number of plant sites \| Plant	1
Australia [Member] \| Performance Chemicals [Member]
Loss Contingencies [Line Items]
Environmental remediation and regulation liability	$ 1,200,000

Commitments and Contingent Liabilities - Changes in Accrued Liability for Environmental Matters (Detail) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Commitments And Contingencies Disclosure [Abstract]
Balance at beginning of year	$ 10.7	$ 11.0
Expense	0.4	0.3
Reversal of reserves	0.0	(0.1)
Cash expenditures	(0.7)	(0.4)
Currency translation	(0.3)	(0.1)
Balance at end of period	$ 10.1	$ 10.7

Subsequent Events - Additional Information (Detail) $ in Millions	Oct. 31, 2022 USD ($)
Subsequent Event [Member] \| Gross & Janes Co [Member]
Subsequent Event [Line Items]
Value of the assets acquired	$ 15