Clearwater Paper (CLW) 10-Q 2 Nov 21 2021 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2021	Nov. 01, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Amendment Flag	false
Document Period End Date	Sep. 30, 2021
Entity File Number	001-34146
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Entity Registrant Name	CLEARWATER PAPER CORPORATION
Entity Central Index Key	0001441236
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	20-3594554
Entity Address, Address Line One	601 West Riverside,
Entity Address, Address Line Two	Suite 1100
Entity Address, City or Town	Spokane,
Entity Address, State or Province	WA
Entity Address, Postal Zip Code	99201
Current Fiscal Year End Date	--12-31
Title of 12(b) Security	Common Stock, par value $0.0001 per share
Trading Symbol	CLW
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Shell Company	false
Entity Emerging Growth Company	false
Entity Small Business	false
Document Transition Report	false
Entity Common Stock, Shares Outstanding		16,689,336
Local Phone Number	344-5900
City Area Code	509

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash	$ 27.8	$ 35.9
Receivables, Net	159.4	160.6
Inventories	286.4	263.3
Other current assets	10	15.2
Total current assets	483.6	474.9
Property, plant and equipment, net	1,109.6	1,191.5
Other assets, net	124.9	134
TOTAL ASSETS	1,718.1	1,800.4
Current liabilities:
Current portion of long-term debt	1.6	1.7
Accounts Payable and Accrued Liabilities	255.2	243.1
Total current liabilities	256.9	244.8
Long-term Debt, Excluding Current Maturities	676.5	716.4
Liability for pension and other postretirement employee benefits	81.7	80.5
Deferred tax liabilities and other long-term obligations	211.3	237.6
TOTAL LIABILITIES	$ 1,226.5	$ 1,279.3
Preferred stock, shares issued (in shares)	0	0
Stockholders' equity:
Preferred stock, par value $0.0001 per share, 5,000,000 authorized shares, no shares issued	$ 0	$ 0
Common stock, par value $0.0001 per share, 100,000,000 authorized shares, 16,687,328 and 16,573,246 shares issued	0	0
Additional paid-in capital	21.7	16.6
Retained earnings	521.2	558.8
Accumulated other comprehensive loss, net of tax	(51.3)	(54.3)
Total stockholders' equity	491.6	521.1
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 1,718.1	$ 1,800.4
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares issued (in shares)	16,687,328	16,573,246

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Accounts Receivable, Allowance for Credit Loss, Current	$ 1.5	$ 1.6
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred Stock, Shares Authorized	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	16,687,328	16,573,246

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Net Sales	$ 450.5	$ 457.4	$ 1,282.8	$ 1,415.9
Costs and expenses:
Cost of sales	(398.2)	(378.6)	(1,160.9)	(1,198.3)
Selling, general and administrative expenses	(28.3)	(29.3)	(82.5)	(89.4)
Other operating charges, net	10.2	0.3	55.1	11.9
Total operating costs and expenses	436.7	408.2	1,298.5	1,299.6
Income (loss) from operations	13.8	49.2	(15.6)	116.2
Interest Expense, Net	(8.9)	(12.2)	(27.5)	(37)
Other Nonoperating Income (Expense)	(2.8)	(1.9)	(7.8)	(5.7)
Gain (Loss) on Extinguishment of Debt	(0.5)	(3.9)	(0.5)	(4.8)
Nonoperating Income (Expense)	(12.2)	(17.9)	(35.7)	(47.5)
Income (loss) before income taxes	1.7	31.3	(51.4)	68.7
Income tax provision (benefit)	(0.3)	9.9	(13.8)	14.1
Net income (loss)	$ 1.9	$ 21.4	$ (37.6)	$ 54.5
Net income (loss) per common share:
Basic (in dollars per share)	$ 0.12	$ 1.29	$ (2.25)	$ 3.29
Diluted (in dollars per share)	$ 0.11	$ 1.28	$ (2.25)	$ 3.27
Weighted Average Number of Shares Outstanding, Basic	16,687	16,595	16,689	16,581
Weighted Average Number of Shares Outstanding, Diluted	16,971	16,783	16,689	16,689

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 1.9	$ 21.4	$ (37.6)	$ 54.5
Other comprehensive income:
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax	(2.8)	0	(2.8)	0
Defined benefit pension and other postretirement employee benefits:
Amortization of actuarial loss included in net periodic cost, net of tax of $0.7, $0.6, $2.0 and $1.9	2	1.8	5.8	5.5
Other comprehensive income (loss), net of tax	(0.8)	1.8	3	5.5
Comprehensive income	$ 1.1	$ 23.2	$ (34.6)	$ 60

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax	$ 0.7	$ 0.6	$ 2	$ 1.9
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax	$ (1)	$ 0	$ (1)	$ 0

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 1.9	$ 21.4	$ (37.6)	$ 54.5
Depreciation and amortization	25.9	27.7	79.6	83.5
Stock-based compensation expense	3.8	2.5	6.9	7.3
Deferred and other income taxes	2.4	12.8	(19.4)	23.5
Pension and other postretirement employee benefits	2.1	0.9	5.3	2.9
Gain (Loss) on Extinguishment of Debt	0.5	3.9	0.5	4.8
Non-cash charges associated with mill closure			37.1
(Increase) decrease in accounts receivable	(12.9)	12.8	(0.1)	(5.7)
(Increase) decrease in inventory	(3.5)	(21)	(28.3)	25
(Increase) decrease in other current assets	0.9	0.6	5.3	(4.8)
Increase (decrease) in accounts payable and accrued liabilities	(4.8)	(5.7)	13.8	(14.4)
Other, net	0	(0.1)	1.4	(0.6)
Net cash flows provided by operating activities	16.3	55.7	64.4	176.1
CASH FLOWS FROM INVESTING ACTIVITIES
Additions to property, plant and equipment	(8.9)	(9.7)	(29.9)	(27.5)
Net cash flows used in investing activities	(8.9)	(9.7)	(29.9)	(27.5)
CASH FLOWS FROM FINANCING ACTIVITIES
Borrowings of short-term debt	0	0	0	108.5
Repayments of short-term debt	0	0	0	(122)
Borrowings of long-term debt	0	275	0	275
Repayments of long-term debt	(40.5)	(317.6)	(41.3)	(379)
Payments for debt issuance costs	0	(4.3)	0	(4.3)
Proceeds from sale of stock under employee awards	0	0	0.5	0
Taxes paid related to net share settlement of equity awards	0	0	(1.7)	(0.7)
Other, net	0	0.2	0	0
Net cash flows used in financing activities	(40.5)	(46.7)	(42.5)	(122.5)
Increase (decrease) in cash, cash equivalents and restricted cash	(33.1)	(0.6)	(8.1)	26.1
Cash, cash equivalents and restricted cash at beginning of period	62	49.2	36.9	22.4
Cash, cash equivalents and restricted cash at end of period	28.9	48.6	28.9	48.6
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid for interest, net of amounts capitalized	15.9	19.5	34.6	43.6
Cash paid (received) for income taxes	1	(4.7)	(8.3)	(6.9)
Cash and cash equivalents	27.8	47.5	27.8	47.5
Restricted cash included in Other assets, net	1.1	1.1	1.1	1.1
Total cash, cash equivalents and restricted cash	$ 28.9	$ 48.6	$ 28.9	$ 48.6

Consolidated Statements of Stoc

Consolidated Statements of Stockholder's Equity Consolidated Statements of Stockholder's Equity - USD ($) shares in Thousands, $ in Millions	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Dec. 31, 2019		16,515
Beginning balance at Dec. 31, 2019	$ 432	$ 0	$ 9.8	$ 481.7	$ (59.5)
Net income	10.3			10.3
Stock-based compensation expense	1.3		1.3
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture		54
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	(0.7)		(0.7)
Pension and other postretirement employee benefit plans, net of tax	1.8				1.8
Ending balance (in shares) at Mar. 31, 2020		16,569
Ending balance at Mar. 31, 2020	444.8	$ 0	10.4	492.1	(57.7)
Beginning balance (in shares) at Dec. 31, 2019		16,515
Beginning balance at Dec. 31, 2019	432	$ 0	9.8	481.7	(59.5)
Net income	54.5
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	0
Ending balance (in shares) at Sep. 30, 2020		16,571
Ending balance at Sep. 30, 2020	496.2	$ 0	13.9	536.3	(54)
Beginning balance (in shares) at Mar. 31, 2020		16,569
Beginning balance at Mar. 31, 2020	444.8	$ 0	10.4	492.1	(57.7)
Net income	22.8			22.8
Stock-based compensation expense	1.4		1.4
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture		2
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	0
Pension and other postretirement employee benefit plans, net of tax	1.8				1.8
Ending balance (in shares) at Jun. 30, 2020		16,571
Ending balance at Jun. 30, 2020	470.8	$ 0	11.8	514.8	(55.8)
Net income	21.4			21.4
Stock-based compensation expense	2.2		2.2
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture		1
Pension and other postretirement employee benefit plans, net of tax	1.8				1.8
Ending balance (in shares) at Sep. 30, 2020		16,571
Ending balance at Sep. 30, 2020	496.2	$ 0	13.9	536.3	(54)
Beginning balance (in shares) at Dec. 31, 2020		16,572
Beginning balance at Dec. 31, 2020	521.1	$ 0	16.6	558.8	(54.3)
Net income	12.1			12.1
Stock-based compensation expense	2		2
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture		105
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	(1.1)		(1.1)
Pension and other postretirement employee benefit plans, net of tax	1.9				1.9
Ending balance (in shares) at Mar. 31, 2021		16,678
Ending balance at Mar. 31, 2021	536.1	$ 0	17.6	570.9	(52.4)
Beginning balance (in shares) at Dec. 31, 2020		16,572
Beginning balance at Dec. 31, 2020	521.1	$ 0	16.6	558.8	(54.3)
Net income	(37.6)
Ending balance (in shares) at Sep. 30, 2021		16,687
Ending balance at Sep. 30, 2021	491.6	$ 0	21.7	521.2	(51.3)
Beginning balance (in shares) at Mar. 31, 2021		16,678
Beginning balance at Mar. 31, 2021	536.1	$ 0	17.6	570.9	(52.4)
Net income	(51.6)			(51.6)
Stock-based compensation expense	1.9		1.9
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture		7
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	(0.1)		(0.1)
Pension and other postretirement employee benefit plans, net of tax	1.9				1.9
Ending balance (in shares) at Jun. 30, 2021		16,685
Ending balance at Jun. 30, 2021	488.1	$ 0	19.3	519.2	(50.5)
Net income	1.9			1.9
Stock-based compensation expense	2.4		2.4
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture		1
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	0		0
Pension and other postretirement employee benefit plans, net of tax	(0.8)				(0.8)
Ending balance (in shares) at Sep. 30, 2021		16,687
Ending balance at Sep. 30, 2021	$ 491.6	$ 0	$ 21.7	$ 521.2	$ (51.3)

Consolidated Statements of St_2

Consolidated Statements of Stockholder's Equity (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020
Statement of Stockholders' Equity [Abstract]
Pension and OPEB, Tax	$ (0.3)	$ 0.7	$ 0.7	$ 0.6	$ 0.6	$ 0.6

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2021
Accounting Policies [Abstract]
Nature of Operations and Basis of Presentation	1 BASIS OF PRESENTATIONThe accompanying unaudited consolidated financial statements have been prepared in accordance with the instructions to Form 10-Q and, in the opinion of management, include all adjustments (consisting of normal recurring adjustments) necessary to present fairly, in all material respects, the consolidated financial position, results of operations, stockholders' equity and cash flows for us and our subsidiaries for the interim periods presented. Results of operations for interim periods are not necessarily indicative of results to be expected for an entire year. These consolidated financial statements should be read in conjunction with the consolidated financial statements and the notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2020. All dollar amounts are shown in millions, except per share.

Recently Adopted and New Accoun

Recently Adopted and New Accounting Standards New Accounting Pronouncements (Notes)	9 Months Ended
	Sep. 30, 2021
Accounting Standards Update and Change in Accounting Principle [Abstract]
New Accounting Pronouncements and Changes in Accounting Principles [Text Block]	RECENTLY ADOPTED AND NEW ACCOUNTING STANDARDS Recently Adopted Accounting Standards In December 2019, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2019-12, Income Taxes (Topic 740) - Simplifying the Accounting for Income Taxes , which removes certain exceptions, such as the general methodology for calculating income taxes in an interim period when a year-to-date loss exceeds the anticipated loss for the year, and simplifies the accounting for income taxes in areas such as franchise tax (or similar tax) that is partially based on income. The new standard is effective for annual and interim periods beginning after December 15, 2020. This ASU was adopted as of January 1, 2021 and did not have a material impact on our consolidated financial statements. We reviewed all other new accounting pronouncements issued in the period and concluded that they are not applicable or not material to our business.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Fair Value Measurements	FAIR VALUE MEASUREMENTS Carrying amounts reported on the balance sheet for cash and cash equivalents, restricted cash, accounts receivable and accounts payable approximate fair value due to the short-term maturity of these instruments. From December 31, 2020 we have made voluntary prepayments of principal of the Term Loan Credit Agreement of $40.0 million. The fair value of our debt is included in the following table: September 30, 2021 December 31, 2020 Term loan maturing 2026, variable interest rate $ 88.9 $ 129.6 2014 Notes, maturing 2025, fixed interest rate $ 324.0 $ 325.1 2020 Notes, maturing 2028, fixed interest rate $ 282.6 $ 285.3 Fair Value of Nonfinancial Assets

Receivables, net (Notes)

Receivables, net (Notes)	9 Months Ended
	Sep. 30, 2021
Receivables, Net, Current [Abstract]
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]	RECEIVABLES Receivables consist of: September 30, 2021 December 31, 2020 Trade accounts receivable $ 148.8 $ 139.0 Allowance for current expected credit losses (1.5) (1.6) Unbilled receivables 7.7 5.1 Taxes receivable 2.9 16.0 Other 1.6 2.1 $ 159.4 $ 160.6

Inventories

Inventories	9 Months Ended
	Sep. 30, 2021
Inventory Disclosure [Abstract]
Inventories	INVENTORIES Inventories consist of: September 30, 2021 December 31, 2020 Logs, chips and sawdust $ 13.9 $ 17.2 Pulp 11.7 11.5 Paperboard and tissue products 162.7 137.0 Materials and supplies 98.1 97.7 $ 286.4 $ 263.3

Payables and Accruals

Payables and Accruals	9 Months Ended
	Sep. 30, 2021
Payables and Accruals [Abstract]
Accounts Payable and Accrued Liabilities Disclosure	ACCOUNTS PAYABLE AND ACCRUED LIABILITIES Accounts payable and accrued liabilities consists of: September 30, 2021 December 31, 2020 Trade payables $ 171.4 $ 143.4 Accrued compensation 31.9 41.7 Operating lease liabilities 16.1 15.3 Accrued interest 4.8 12.6 Accrued taxes other than income 12.9 10.5 Other accrued liabilities 18.2 19.6 $ 255.2 $ 243.1 Included in accounts payable and accrued liabilities is $8.9 million and $12.1 million related to capital expenditures that had not yet been paid as of September 30, 2021 and December 31, 2020.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Taxes	INCOME TAXES For interim periods, accounting standards require that income tax expense be determined by applying the estimated annual effective income tax rate to year-to-date results, unless this method does not result in a reliable estimate of year-to-date income tax expense. Each period, the income tax accrual is adjusted to the latest estimate and the difference from the previously accrued year-to-date balance is adjusted to the current quarter. For the nine months ended September 30, 2021, our income tax expense reflects an income tax benefit of $13.8 million as compared to an income tax provision of $14.1 million in the comparable period of 2020. Our effective tax rate for the first nine months of 2021 of 26.8% varied from the U.S. statutory tax rate of 21% primarily due to the effects of state taxes and nondeductible compensation. Our effective tax rate for the first nine months of 2020 approximated the statutory U.S. federal income tax rate of 21% and included a $7.0 million benefit from the provisions of the Coronavirus Aid, Relief, and Economic Security Act.

Other Operating Charges, net (N

Other Operating Charges, net (Notes)	9 Months Ended
	Sep. 30, 2021
Other Income and Expenses [Abstract]
Other Operating Income and Expense	OTHER OPERATING CHARGES The major components of “Other operating charges, net” in the Consolidated Statements of Operations for the quarter and nine months ended September 30, 2021 and 2020 are reflected in the table below and described in the paragraphs following the table: Quarter Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Costs associated with mill closure $ 5.4 $ — $ 47.1 $ — Reorganization and other expenses 3.4 — 7.3 3.4 Union settlement — — — 6.6 Gain on divested assets — — — (1.4) Directors' equity-based compensation 1.4 0.3 0.6 2.5 Other — — — 0.8 $ 10.2 $ 0.3 $ 55.1 $ 11.9 2021 During the third quarter of 2021, we recorded $10.2 million of expenses in "Other operating charges, net." The components of the expense include: • expense of $5.4 million associated with mill closure related to severance and other related closure costs; • expense of $3.4 million related to reorganization and other expenses including consulting fees associated with our efforts to achieve long-term performance improvements, and • expense of $1.4 million relating to directors' equity based compensation which is remeasured each period based upon changes in our stock price. During the second quarter of 2021, we recorded $44.5 million of expenses in "Other operating charges, net." The components of the expense include: • expense of $41.7 million associated with mill closure including $36.9 million associated with the impairment of fixed assets and certain inventory and $4.9 million associated with severance and other related closure costs; • expense of $4.0 million related to reorganization and other expenses including severance and consulting fees associated with our efforts to achieve long-term performance improvements, and • reversal of expense of $1.1 million relating to directors' equity based compensation which is remeasured each period based upon changes in our stock price. During the first quarter of 2021, we recorded $0.4 million of expenses in "Other operating charges, net." The components of the expense include: • expense of $0.4 million relating to directors' equity based compensation which is remeasured each period based upon changes in our stock price. 2020 During the third quarter of 2020 we recorded $0.3 million of expenses in "Other operating charges, net." The components of the expenses include: • expense of $0.3 million relating to directors' equity based compensation which is remeasured each period based upon changes in our stock price. During the second quarter of 2020 we recorded $3.0 million of expenses in "Other operating charges, net." The components of the expenses include: • expense of $0.6 million related to reorganization expenses (primarily related to corporate expenses), and • expense of $1.9 million relating to directors' equity based compensation which is remeasured each period based upon changes in our stock price. During the first quarter of 2020, we recorded $8.6 million of net expenses in "Other operating charges, net." The components of the expense included: • expense of $2.8 million related to reorganization expenses (primarily related to corporate expenses); • expense of $6.6 million associated with union settlement retroactive wage payments ($2.6 million associated with Consumer Products and $4.0 million associated with Pulp and Paperboard segments); • gain of $1.4 million associated with the Ladysmith Consumer Products facility sale escrow release, and • expense of $0.2 million relating to directors' equity based compensation which is remeasured each period based upon changes in our stock price

Non-operating Income (Expense)

Non-operating Income (Expense) (Notes)	9 Months Ended
	Sep. 30, 2021
Nonoperating Income (Expense) [Abstract]
Other Nonoperating Income and Expense [Text Block]	NON-OPERATING INCOME (EXPENSE) The components of “Non-operating expense” in the Consolidated Statements of Operations for the quarter and nine months ended September 30, 2021 and 2020 are reflected in the table below: Quarter Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Interest expense $ (8.5) $ (11.7) $ (26.9) $ (35.4) Capitalized interest 0.1 — 0.2 — Amortization of debt issuance costs (0.5) (0.5) (1.4) (1.7) Interest income — — 0.6 — Interest expense, net (8.9) (12.2) (27.5) (37.0) Debt retirement costs (0.5) (3.9) (0.5) (4.8) Non-operating pension and other postretirement employee benefits expense (2.8) (1.9) (7.8) (5.7) Total non-operating expense $ (12.2) $ (17.9) $ (35.7) $ (47.5) For the third quarter and nine months ended September 30, 2021, debt retirement costs consist of $0.5 million associated with the write off of deferred debt costs related to the voluntary prepayments of the Term Loan maturing in 2026. For the quarter and nine months ended September 30, 2020, we recorded $3.9 million and $4.8 million in debt retirement cost consisting of $1.2 million related to the write off unamortized debt cost along with the premium on debt redemption of $2.1 million associated with the redemption of the $275.0 million aggregate principle amount of 4.5% senior notes due in 2023 and $0.6 million in the third quarter of 2020 and $1.6 million on in the first nine months of 2020 associated with the prepayment of the Term Loan maturing in 2026.

Pension and Other Postretiremen

Pension and Other Postretirement Employee Benefit Plans	3 Months Ended
	Sep. 30, 2021
Postemployment Benefits [Abstract]
Pension and Other Postretirement Employee Benefit Plans	PENSION AND POSTRETIREMENT EMPLOYEE BENEFIT PLANS The following table details the components of net periodic cost of our company-sponsored pension and other postretirement employee benefit plans for the periods presented: Quarter Ended September 30, Nine Months Ended September 30, Pension Benefit Plans 2021 2020 2021 2020 Service cost $ 0.4 $ 0.5 $ 1.4 $ 1.7 Interest cost 2.1 2.6 6.3 7.8 Expected return on plan assets (2.6) (3.8) (7.9) (11.3) Amortization of actuarial loss 2.5 2.4 7.7 7.4 Net periodic cost $ 2.4 $ 1.7 $ 7.4 $ 5.6 Quarter Ended September 30, Nine Months Ended September 30, Other Postretirement Employee Benefit Plans 2021 2020 2021 2020 Service cost $ 0.2 $ — $ 0.3 $ 0.1 Interest cost 0.6 0.6 1.5 1.8 Amortization of actuarial loss 0.2 — 0.2 — Net periodic cost $ 1.0 $ 0.7 $ 2.0 $ 1.8

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss (Notes)	9 Months Ended
	Sep. 30, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	ACCUMULATED OTHER COMPREHENSIVE LOSS Accumulated other comprehensive loss, net of tax, is comprised of the following: Pension Plan Adjustments Other Post Retirement Employee Benefit Plan Adjustments Total Balance at December 31, 2019 $ (67.8) $ 8.3 $ (59.5) Amounts reclassified from accumulated other comprehensive loss 5.5 — 5.5 Balance at September 30, 2020 $ (62.4) $ 8.3 $ (54.0) Balance at December 31, 2020 $ (54.5) $ 0.2 $ (54.3) Other comprehensive loss before reclassifications — (2.8) (2.8) Amounts reclassified from accumulated other comprehensive loss 5.7 0.2 5.8 Balance at September 30, 2021 $ (48.9) $ (2.4) $ (51.3)

Stockholders' Equity

Stockholders' Equity	9 Months Ended
	Sep. 30, 2021
Share-based Payment Arrangement [Abstract]
Equity-Based Compensation	STOCKHOLDERS' EQUITY Common Stock Plans We have stock-based compensation plans under which restricted stock awards and stock options are outstanding or granted subject to time or performance vesting requirements. At September 30, 2021, approximately 1.1 million shares were available for future issuance under our current plan. Quarter Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Total stock-based compensation expense (selling, general and administrative and other operating charges, net) $ 3.8 $ 2.5 $ 6.9 $ 7.3 Income tax benefit related to stock-based compensation $ 1.0 $ 0.6 $ 1.8 $ 1.9 Impact on cash flow due to taxes paid related to net share settlement of equity awards and proceeds from sale of stock under employee awards $ — $ — $ 1.2 $ 0.7 At September 30, 2021, $14.1 million of compensation cost related to unvested restricted stock units and performance awards had not yet been recognized. During the nine months ended September 30, 2021, we granted 179,528 restricted stock units (time vesting) at an average grant date fair value of $35.68 per share and 68,070 restricted stock units (performance vesting) at an average grant date fair value of $39.79 per share.

Earnings per Common Share

Earnings per Common Share	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Earnings per Common Share	EARNINGS PER SHARE Basic income per share is based on the weighted-average number of shares of common stock outstanding. Diluted income per share is based upon the weighted-average number of shares of common stock outstanding plus all potentially dilutive securities that were assumed to be converted into common shares at the beginning of the period under the treasury stock method. This method requires the effect of potentially dilutive common stock equivalents be excluded from the calculation of diluted earnings per share for the periods in which net losses are reported because the effect is anti-dilutive. Quarter Ended September 30, Nine Months Ended September 30, (In thousands) 2021 2020 2021 2020 Basic weighted-average common shares outstanding 16,687 16,595 16,689 16,581 Incremental shares due to: Stock-based awards 186 188 — 107 Performance shares 98 — — — Diluted weighted-average common shares outstanding 16,971 16,783 16,689 16,689 .

Segment Information

Segment Information	3 Months Ended
	Sep. 30, 2021
Segment Reporting [Abstract]
Segment Information	SEGMENT INFORMATION We operate in two segments: Pulp and Paperboard and Consumer Products. Our business units have been aggregated into these two segments based upon the similarity of economic characteristics, customers and distribution methods. Our results of operations are summarized below for each of these segments separately. Segment information was prepared in accordance with the same accounting principles as those described in Note 1 of the Notes to the Consolidated Financial Statements included in our Annual Report on Form 10-K for the year ended December 31, 2020. Certain amounts have been reclassified from the prior year presentation to reflect the realignment of Clearwater Paper’s baled pulp sales to record inter-segment sales at market price and the realignment of outside pulp sales to the producing segment. Quarter Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Segment net sales: Pulp and Paperboard $ 237.5 $ 217.2 $ 684.6 $ 656.8 Consumer Products 214.2 245.9 603.2 779.7 Eliminations (1.2) (5.6) (5.0) (20.6) Total segment net sales $ 450.5 $ 457.4 $ 1,282.8 $ 1,415.9 Operating income (loss): Pulp and Paperboard $ 34.6 $ 32.6 $ 72.6 $ 90.8 Consumer Products 3.7 31.5 11.5 82.9 Corporate and eliminations (14.3) (14.6) (44.8) (45.6) Other operating charges, net (10.2) (0.3) (55.1) (11.9) Income (loss) from operations $ 13.8 $ 49.2 $ (15.6) $ 116.2 Net sales, classified by major products were as follows: Quarter Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Major products: Paperboard $ 224.1 $ 207.4 $ 648.8 $ 621.7 Retail tissue 208.3 238.6 572.9 747.0 Non-retail tissue 5.7 6.9 30.1 31.0 Pulp 8.4 8.1 23.9 30.1 Other 5.1 2.1 12.2 6.7 Eliminations (1.2) (5.6) (5.0) (20.6) Total net sales $ 450.5 $ 457.4 $ 1,282.8 $ 1,415.9

Receivables, net (Tables)

Receivables, net (Tables)	9 Months Ended
	Sep. 30, 2021
Receivables, Net, Current [Abstract]
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]	September 30, 2021 December 31, 2020 Trade accounts receivable $ 148.8 $ 139.0 Allowance for current expected credit losses (1.5) (1.6) Unbilled receivables 7.7 5.1 Taxes receivable 2.9 16.0 Other 1.6 2.1 $ 159.4 $ 160.6

Inventories - (Tables)

Inventories - (Tables)	9 Months Ended
	Sep. 30, 2021
Inventory Disclosure [Abstract]
Inventories	Inventories consist of: September 30, 2021 December 31, 2020 Logs, chips and sawdust $ 13.9 $ 17.2 Pulp 11.7 11.5 Paperboard and tissue products 162.7 137.0 Materials and supplies 98.1 97.7 $ 286.4 $ 263.3

Other Operating Charges, net (T

Other Operating Charges, net (Tables)	9 Months Ended
	Sep. 30, 2021
Other Income and Expenses [Abstract]
Schedule of Other Operating Cost and Expense, by Component [Table Text Block]	Quarter Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Costs associated with mill closure $ 5.4 $ — $ 47.1 $ — Reorganization and other expenses 3.4 — 7.3 3.4 Union settlement — — — 6.6 Gain on divested assets — — — (1.4) Directors' equity-based compensation 1.4 0.3 0.6 2.5 Other — — — 0.8 $ 10.2 $ 0.3 $ 55.1 $ 11.9

Non-operating Income (Expense_2

Non-operating Income (Expense) (Tables)	9 Months Ended
	Sep. 30, 2021
Nonoperating Income (Expense) [Abstract]
Schedule of Other Nonoperating Income (Expense) [Table Text Block]	Quarter Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Interest expense $ (8.5) $ (11.7) $ (26.9) $ (35.4) Capitalized interest 0.1 — 0.2 — Amortization of debt issuance costs (0.5) (0.5) (1.4) (1.7) Interest income — — 0.6 — Interest expense, net (8.9) (12.2) (27.5) (37.0) Debt retirement costs (0.5) (3.9) (0.5) (4.8) Non-operating pension and other postretirement employee benefits expense (2.8) (1.9) (7.8) (5.7) Total non-operating expense $ (12.2) $ (17.9) $ (35.7) $ (47.5)

Pension and Other Postretirem_2

Pension and Other Postretirement Employee Benefit Plans - (Tables)	9 Months Ended
	Sep. 30, 2021
Retirement Benefits [Abstract]
Components of Net Periodic Cost of Pension and Other Postretirement Employee Benefit Plans	The following table details the components of net periodic cost of our company-sponsored pension and other postretirement employee benefit plans for the periods presented: Quarter Ended September 30, Nine Months Ended September 30, Pension Benefit Plans 2021 2020 2021 2020 Service cost $ 0.4 $ 0.5 $ 1.4 $ 1.7 Interest cost 2.1 2.6 6.3 7.8 Expected return on plan assets (2.6) (3.8) (7.9) (11.3) Amortization of actuarial loss 2.5 2.4 7.7 7.4 Net periodic cost $ 2.4 $ 1.7 $ 7.4 $ 5.6 Quarter Ended September 30, Nine Months Ended September 30, Other Postretirement Employee Benefit Plans 2021 2020 2021 2020 Service cost $ 0.2 $ — $ 0.3 $ 0.1 Interest cost 0.6 0.6 1.5 1.8 Amortization of actuarial loss 0.2 — 0.2 — Net periodic cost $ 1.0 $ 0.7 $ 2.0 $ 1.8
Defined Contribution Plan Disclosures	We record the service component of net periodic cost (benefit) as part of "Cost of sales" and "Selling, general, and administrative expenses," while the non-service components of net periodic cost (benefit) are recorded to "Other non-operating expense" on our Consolidated Statements of Operations. For the quarter and nine months ended September 30, 2021, we recorded $0.6 million and $1.5 million to "Cost of sales" and less than $0.1 million and $0.2 million to "Selling, general, and administrative expenses." For the quarter and nine months ended September 30, 2020, we recorded $0.3 million and $1.1 million to "Cost of sales" and $0.2 million and $0.7 million to "Selling, general, and administrative expenses."

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss (Tables)	9 Months Ended
	Sep. 30, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]	Accumulated other comprehensive loss, net of tax, is comprised of the following: Pension Plan Adjustments Other Post Retirement Employee Benefit Plan Adjustments Total Balance at December 31, 2019 $ (67.8) $ 8.3 $ (59.5) Amounts reclassified from accumulated other comprehensive loss 5.5 — 5.5 Balance at September 30, 2020 $ (62.4) $ 8.3 $ (54.0) Balance at December 31, 2020 $ (54.5) $ 0.2 $ (54.3) Other comprehensive loss before reclassifications — (2.8) (2.8) Amounts reclassified from accumulated other comprehensive loss 5.7 0.2 5.8 Balance at September 30, 2021 $ (48.9) $ (2.4) $ (51.3)

Stockholders' Equity - (Tables)

Stockholders' Equity - (Tables)	9 Months Ended
	Sep. 30, 2021
Share-based Payment Arrangement [Abstract]
Employee Equity-Based Compensation Expense	Quarter Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Total stock-based compensation expense (selling, general and administrative and other operating charges, net) $ 3.8 $ 2.5 $ 6.9 $ 7.3 Income tax benefit related to stock-based compensation $ 1.0 $ 0.6 $ 1.8 $ 1.9 Impact on cash flow due to taxes paid related to net share settlement of equity awards and proceeds from sale of stock under employee awards $ — $ — $ 1.2 $ 0.7

Earnings per Common Share - (Ta

Earnings per Common Share - (Tables)	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Reconciliation of Number of Common Shares Used in Calculating Basic and Diluted Net Earnings per Share	Quarter Ended September 30, Nine Months Ended September 30, (In thousands) 2021 2020 2021 2020 Basic weighted-average common shares outstanding 16,687 16,595 16,689 16,581 Incremental shares due to: Stock-based awards 186 188 — 107 Performance shares 98 — — — Diluted weighted-average common shares outstanding 16,971 16,783 16,689 16,689 .

Segment Information - (Tables)

Segment Information - (Tables)	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021
Segment Reporting [Abstract]
Reportable Segments Information		Quarter Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Segment net sales: Pulp and Paperboard $ 237.5 $ 217.2 $ 684.6 $ 656.8 Consumer Products 214.2 245.9 603.2 779.7 Eliminations (1.2) (5.6) (5.0) (20.6) Total segment net sales $ 450.5 $ 457.4 $ 1,282.8 $ 1,415.9 Operating income (loss): Pulp and Paperboard $ 34.6 $ 32.6 $ 72.6 $ 90.8 Consumer Products 3.7 31.5 11.5 82.9 Corporate and eliminations (14.3) (14.6) (44.8) (45.6) Other operating charges, net (10.2) (0.3) (55.1) (11.9) Income (loss) from operations $ 13.8 $ 49.2 $ (15.6) $ 116.2
Disaggregation of Revenue [Table Text Block]	Quarter Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Major products: Paperboard $ 224.1 $ 207.4 $ 648.8 $ 621.7 Retail tissue 208.3 238.6 572.9 747.0 Non-retail tissue 5.7 6.9 30.1 31.0 Pulp 8.4 8.1 23.9 30.1 Other 5.1 2.1 12.2 6.7 Eliminations (1.2) (5.6) (5.0) (20.6) Total net sales $ 450.5 $ 457.4 $ 1,282.8 $ 1,415.9

Fair Value Measurements (Detail

Fair Value Measurements (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Asset Impairment Charges	$ 36.9
Term Loan [Member] | Estimate of Fair Value Measurement
Long-term Debt, Fair Value	88.9	$ 129.6
Term Loan [Member]
Debt Instrument, Increase (Decrease), Other, Net	(40)
Senior Note Due 2025 [Member] | Estimate of Fair Value Measurement
Long-term Debt, Fair Value	324	325.1
Senior Note Due 2028 [Member] | Estimate of Fair Value Measurement
Long-term Debt, Fair Value	$ 282.6	$ 285.3

Receivables, net (Details)

Receivables, net (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Receivables, Net, Current [Abstract]
Accounts Receivable, before Allowance for Credit Loss, Current	$ 148.8	$ 139
Accounts Receivable, Allowance for Credit Loss, Current	(1.5)	(1.6)
Unbilled Receivables, Current	7.7	5.1
Income Taxes Receivable, Current	2.9	16
Other Receivables, Net, Current	1.6	2.1
Receivables, Net	$ 159.4	$ 160.6

Inventories - Inventories (Deta

Inventories - Inventories (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Inventory [Line Items]
Logs, chips and sawdust	$ 13.9	$ 17.2
Pulp	11.7	11.5
Paperboard and tissue products	162.7	137
Materials and supplies	98.1	97.7
Inventories	$ 286.4	$ 263.3

Payables and Accruals (Details)

Payables and Accruals (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Payables and Accruals [Abstract]
Trade payables	$ 171.4		$ 143.4
Accrued compensation	31.9		41.7
Operating Lease, Liability, Current	16.1		15.3
Interest Payable, Current	4.8		12.6
Accrual for Taxes Other than Income Taxes, Current	12.9		10.5
Other Accrued Liabilities, Current	18.2		19.6
Accounts Payable and Accrued Liabilities	255.2		$ 243.1
Capital Expenditures Incurred but Not yet Paid	$ 8.9	$ 12.1

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Income Tax Expense (Benefit)	$ (0.3)	$ 9.9	$ (13.8)	$ 14.1
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			21.00%	21.00%
CARES Act Tax Benefit		$ 7		$ 7
Effective Income Tax Rate Reconciliation, Percent			26.80%

Other Operating Charges, net (D

Other Operating Charges, net (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Gain (Loss) on Disposition of Assets	$ 0			$ 0		$ (1.4)	$ 0	$ (1.4)
Other operating charges, net	10.2	$ 44.5	$ 0.4	0.3	$ 3	8.6	55.1	11.9
Asset Impairment Charges							36.9
Director [Member]
Share based compensation expense	1.4			0.3			0.6	2.5
Reorganization Expenses [Member]
Other Cost and Expense, Operating	3.4			0	0.6	2.8	7.3	3.4
Union settlement [Member]
Other Cost and Expense, Operating	0			0		6.6	0	6.6
Union settlement [Member] | Consumer Products
Other Cost and Expense, Operating						2.6
Union settlement [Member] | Pulp And Paperboard [Member]
Other Cost and Expense, Operating						4
Other Expense [Member]
Other Cost and Expense, Operating	0			0			0	0.8
Other Operating Income (Expense)
Asset Impairment Charges		36.9
Severance Costs		4.9
Reorganization Items	3.4	4
Other Operating Income (Expense) | Director [Member]
Share based compensation expense	1.4	(1.1)	$ 0.4	0.3	$ 1.9	$ 0.2
Closure and impairment costs - Neenah
Other Cost and Expense, Operating	$ 5.4	$ 41.7		$ 0			$ 47.1	$ 0

Non-operating Income (Expense_3

Non-operating Income (Expense) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Nonoperating Income (Expense) [Abstract]
Interest Expense	$ (8.5)	$ (11.7)	$ (26.9)	$ (35.4)
Amortization of Debt Issuance Costs	(0.5)	(0.5)	(1.4)	(1.7)
Interest Income, Other	0	0	0.6	0
Interest Expense, Net	(8.9)	(12.2)	(27.5)	(37)
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component	(2.8)	(1.9)	(7.8)	(5.7)
Nonoperating Income (Expense)	(12.2)	(17.9)	(35.7)	(47.5)
Write off of Deferred Debt Issuance Cost	(0.5)	(3.9)	(0.5)	(4.8)
Amortization of Debt Issuance Costs	0.5	0.5	1.4	1.7
Interest Costs Capitalized Adjustment	$ 0.1	0	$ 0.2	0
Senior Note Due 2023 [Member]
Debt Extinguishment costs, Premium on Bonds [Abstract]				2.1
Term Loan [Member]
Write off of Deferred Debt Issuance Cost		(0.6)		$ (1.6)
Senior Note Due 2023 [Member]
Write off of Deferred Debt Issuance Cost		$ (1.2)
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate		4.50%		4.50%
Debt Instrument, Face Amount		$ 275		$ 275

Pension and Other Postretirem_3

Pension and Other Postretirement Employee Benefit Plans - Narrative (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	$ 0.4	$ 0.5	$ 1.4	$ 1.7
Interest cost	2.1	2.6	6.3	7.8
Expected return on plan assets	(2.6)	(3.8)	(7.9)	(11.3)
Defined Benefit Plan, Amortization of Gain (Loss)	2.5	2.4	7.7	7.4
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	2.4	1.7	7.4	5.6
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	0.2	0	0.3	0.1
Interest cost	0.6	0.6	1.5	1.8
Defined Benefit Plan, Amortization of Gain (Loss)	0.2	0	0.2	0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	1	0.7	2	1.8
Cost of Sales [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	0.6		1.5
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax		0.3		1.1
Selling, General and Administrative Expenses [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	$ 0.1		$ 0.2
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax		$ 0.2		$ 0.7

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (51.3)	$ (54)	$ (54.3)	$ (59.5)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(2.8)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	5.8	5.5
Pension Plan [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(48.9)	(62.4)	(54.5)	(67.8)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0
Pension Plan [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	5.7	5.5
Other Postretirement Benefits Plan [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(2.4)	8.3	$ 0.2	$ 8.3
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(2.8)
Other Postretirement Benefits Plan [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	$ 0.2	$ 0

Stockholders' Equity - (Detail)

Stockholders' Equity - (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	1,100,000		1,100,000
Stock-based compensation expense	$ 3.8	$ 2.5	$ 6.9	$ 7.3
Share-based Payment Arrangement, Expense, Tax Benefit	1	0.6	1.8	1.9
Proceeds, Issuance of Shares, Share-based Payment Arrangement, Including Option Exercised			1.2	0.7
Payment, Tax Withholding, Share-based Payment Arrangement	$ 0	$ 0	$ 1.7	$ 0.7
Weighted Average Number of Shares Outstanding, Diluted	16,971,000	16,783,000	16,689,000	16,689,000
Equity Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 14.1		$ 14.1
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of share-based awards granted			179,528
Grant-date fair value of awards per share			$ 35.68
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	186,000	188,000	0	107,000
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of share-based awards granted			68,070
Grant-date fair value of awards per share			$ 39.79
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	98,000	0	0	0

Earnings per Common Share - Rec

Earnings per Common Share - Reconciliation of Number of Common Shares Used in Calculating Basic and Diluted Net Earnings Per Share (Detail) - $ / shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Weighted Average Number of Shares Outstanding, Basic	16,687	16,595	16,689	16,581
Weighted Average Number of Shares Outstanding, Diluted	16,971	16,783	16,689	16,689
Basic net earnings per common share (in dollars per share)	$ 0.12	$ 1.29	$ (2.25)	$ 3.29
Diluted net earnings per common share (in dollars per share)	$ 0.11	$ 1.28	$ (2.25)	$ 3.27
Anti-dilutive shares excluded from calculation	300	400	600	600
Performance Shares [Member]
Earnings Per Share [Abstract]
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	98	0	0	0
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	98	0	0	0

Segment Information (Detail)

Segment Information (Detail) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Net Sales	$ 450.5			$ 457.4			$ 1,282.8	$ 1,415.9
Income from operations	13.8			49.2			(15.6)	116.2
Other operating charges, net	(10.2)	$ (44.5)	$ (0.4)	(0.3)	$ (3)	$ (8.6)	(55.1)	(11.9)
Intersegment Eliminations
Segment Reporting Information [Line Items]
Net Sales	(1.2)			(5.6)			(5)	(20.6)
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Income from operations	(14.3)			(14.6)			(44.8)	(45.6)
Consumer Products
Segment Reporting Information [Line Items]
Net Sales	214.2			245.9			603.2	779.7
Income from operations	3.7			31.5			11.5	82.9
Pulp And Paperboard [Member]
Segment Reporting Information [Line Items]
Net Sales	237.5			217.2			684.6	656.8
Income from operations	34.6			32.6			72.6	90.8
Retail tissue [Domain]
Segment Reporting Information [Line Items]
Net Sales	208.3			238.6			572.9	747
Paperboard [Domain]
Segment Reporting Information [Line Items]
Net Sales	224.1			207.4			648.8	621.7
Non-retail tissue [Domain]
Segment Reporting Information [Line Items]
Net Sales	5.7			6.9			30.1	31
Pulp [Domain]
Segment Reporting Information [Line Items]
Net Sales	8.4			8.1			23.9	30.1
Other [Domain]
Segment Reporting Information [Line Items]
Net Sales	$ 5.1			$ 2.1			$ 12.2	$ 6.7