Clearwater Paper (CLW) 10-K 24 Feb 25 2024 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Feb. 20, 2025	Jun. 30, 2024
Document and Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2024
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	FY
Entity Registrant Name	CLEARWATER PAPER CORPORATION
Entity Central Index Key	0001441236
Entity File Number	001-34146
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Document Annual Report	true
Document Transition Report	false
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	20-3594554
Entity Address, Postal Zip Code	99201
Entity Address, Address Line Two	Suite 1100
Entity Address, Address Line One	601 West Riverside,
Entity Address, State or Province	WA
Entity Address, City or Town	Spokane,
City Area Code	509
Local Phone Number	344-5900
Title of 12(b) Security	Common Stock ($0.0001 par value per share)
Trading Symbol	CLW
Security Exchange Name	NYSE
Entity Interactive Data Current	Yes
Entity Common Stock, Shares Outstanding		16,175,161
Entity Public Float			$ 788.5
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Document Financial Statement Error Correction [Flag]	false
Auditor Name	KPMG LLP
Auditor Location	Seattle, Washington

Audit Information

Audit Information	12 Months Ended
	Dec. 31, 2024
Document and Entity Information [Abstract]
Auditor Name	KPMG LLP
Auditor Firm ID	185
Auditor Location	Seattle, Washington

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 79.6	$ 42
Receivables, net of allowance for current expected credit losses of $1.6 and $1.2 at December 31, 2024 and 2023	188.7	96.1
Inventories, net	258	161.2
Other current assets	19.1	17.4
Disposal Group, Including Discontinued Operation, Assets, Current	0	247.5
Total current assets	545.4	564.1
Property, plant and equipment, net	1,023.1	360.7
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	1,305.4	1,247.9
Property, plant and equipment	1,023.1	360.7
Intangible Assets, Net (Including Goodwill)	52.9	41.5
Other assets, net	57.9	47.6
Disposal Group, Including Discontinued Operation, Assets, Noncurrent	0	657.9
Total assets	1,679.2	1,671.8
Current liabilities:
Current portion of long-term debt	0.6	0
Accounts payable and accrued liabilities	319.7	195.5
Disposal Group, Including Discontinued Operation, Liabilities, Current	0	90.5
Total current liabilities	320.4	286
Long-term debt	281.6	439.9
Liability for pension and other postretirement employee benefits	52.5	54.5
Deferred tax liabilities and other long-term obligations	170.2	84.6
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent	0	138.1
Total liabilities	824.7	1,003
Stockholders' equity:
Preferred stock, par value $0.0001 per share, 5,000,000 shares authorized, no shares issued	0	0
Common stock, par value $0.0001 per share, 100,000,000 shares authorized, 16,567,722 and 16,484,550 shares issued	0	0
Additional paid-in capital	11.5	14.9
Treasury Stock, Value	3.3	0
Retained earnings	880.8	684.5
Accumulated other comprehensive loss, net of tax	(34.5)	(30.7)
Stockholders' Equity Attributable to Parent, Total	854.6	668.8
Total liabilities and stockholders' equity	$ 1,679.2	$ 1,671.8

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Accounts Receivable, Allowance for Credit Loss, Current	$ (1.6)	$ (1.2)
Preferred Stock, Par or Stated Value Per Share	$ 0.0001
Preferred Stock, Shares Authorized	5,000,000
Preferred Stock, Shares Issued	0
Common Stock, Par or Stated Value Per Share	$ 0.0001
Common stock, authorized (in shares)	100,000,000
Common stock, shares issued (in shares)	16,567,722	16,484,550
Treasury Stock, Common, Shares	122,821	0

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Statement [Abstract]
Net sales	$ 1,383.6	$ 1,136	$ 1,195
Costs and expenses:
Cost of sales	(1,307.5)	(935.3)	(982.5)
Selling, general and administrative expenses	(116.7)	(119.4)	(110)
Other operating charges, net	24	3.2	3.2
Total operating costs and expenses	1,448.1	1,057.9	1,095.7
Income (loss) from continuing operations	(64.5)	78.1	99.3
Interest expense, net	(29.2)	(9.5)	(11.2)
Debt retirement costs	(9.1)	(3.1)	(0.5)
Other Nonoperating Income (Expense)	1.8	0.1	(5.7)
Nonoperating Income (Expense)	36.6	12.5	17.4
Income (loss) from continuing operations before income taxes	(101.1)	65.6	81.9
Income tax provision	(27.1)	16.9	29.2
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	74	(48.7)	(52.7)
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax	73.3	78.6	(8.8)
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax	307.2	0	0
Discontinued Operation, Tax Effect of Gain (Loss) from Disposal of Discontinued Operation	110.2	19.6	(2.1)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	(270.3)	(59)	6.7
Net income	$ 196.3	$ 107.7	$ 46
Income (Loss) from Continuing Operations, Per Basic Share	$ (4.41)	$ 2.89	$ 3.10
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share	16.11	3.50	(0.39)
Earnings per share, basic	11.70	6.39	2.71
Income (Loss) from Continuing Operations, Per Diluted Share	(4.41)	2.85	3.07
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	16.11	3.45	(0.39)
Earnings per share, diluted	$ 11.70	$ 6.30	$ 2.68
Weighted average number of shares outstanding, basic	16,781,000	16,863,000	16,985,000
Weighted average number of shares outstanding, diluted	16,781,000	17,091,000	17,181,000

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Net earnings	$ 196.3	$ 107.7	$ 46
Defined benefit pension and other postretirement employee benefits:
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax	(3.6)	2.8	4.7
Amortization of actuarial (gain) loss included in net periodic cost, net of tax of $(0.1), $(0.1) and $1.6	(0.3)	(0.2)	4.7
Other comprehensive (loss) income, net of tax	(3.8)	2.6	9.3
Comprehensive income	$ 192.5	$ 110.3	$ 55.3

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Net (loss) gain arising during the period, tax benefit (provision)	$ 1.2	$ (0.9)	$ (1.5)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax	0.1	0.1	(1.6)
Net earnings	$ 196.3	$ 107.7	$ 46

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES
Net earnings	$ 196.3	$ 107.7	$ 46
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	99.8	98.6	103.3
Equity-based compensation expense	5.6	9.9	12.7
Deferred Income Taxes and Tax Credits	39	(14.9)	(7.9)
Defined benefit pension and other postretirement employee benefits	(4.2)	(2)	3
Proceeds from Divestiture of Businesses	(307.2)	0	0
Amortization of deferred debt costs and debt retirement	11.8	4.4	2
Loss on sale or impairment associated with assets	1.9	2.1	6.1
(Increase) decrease in accounts receivable	(87.2)	(1.3)	(16.9)
(Increase) decrease in inventories	12.4	4	(46.3)
(Increase) decrease in other current assets	(2.5)	0.8	(2.4)
Increase (Decrease) in Accounts Payable and Accrued Liabilities	98.9	(21.3)	49.2
Other, net	(3)	2.6	1.5
Net cash flows provided by operating activities	61.4	190.7	150.2
CASH FLOWS FROM INVESTING ACTIVITIES
Payments to Acquire Property, Plant, and Equipment	(116.6)	(73.7)	(33.5)
Payments to Acquire Businesses, Gross	(708.2)	0	0
Proceeds from business divestiture	992.5	0	0
Net cash flows provided by (used in) investing activities	167.7	(73.7)	(33.5)
CASH FLOWS FROM FINANCING ACTIVITIES
Borrowings on long-term debt	753.4	222	0
Repayments of long-term debt	(931.1)	(325.6)	(80.9)
Payment, Tax Withholding, Share-based Payment Arrangement	(4.1)	(4.7)	(2.5)
Payments for Repurchase of Common Stock	(10)	(17.9)	(5)
Payments for debt issuance costs	(5.6)	(3.1)	(0.9)
Other, net	5.9	0	0.8
Net cash flows used in financing activities	(191.4)	(129.4)	(88.6)
Increase (decrease) in cash and cash equivalents	37.7	(12.4)	28.2
Cash and cash equivalents at beginning of period	79.6	42	54.4	$ 26.2
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid for interest, net of amounts capitalized	52.4	37.8	33
Cash paid for income taxes, net of refunds received	19	16.6	43
Capital Expenditures Incurred but Not yet Paid	$ 25.8	$ 13	$ 15.7

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock, Common
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity Attributable to Parent, Total	$ 511.7		$ 23.6	$ 530.7	$ (42.6)
Shares, Outstanding, Beginning Balance at Dec. 31, 2021		16,692,000
Stockholders' Equity Attributable to Parent, Beginning Balance at Dec. 31, 2021	511.7		23.6	530.7	(42.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	46			46
APIC, Share-based Payment Arrangement, Increase for Cost Recognition			11.7
Performance share and restricted stock unit awards (in shares)		220,000
Performance share and restricted stock unit awards	(1.8)		(1.8)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	9.3				(9.3)
Stock Repurchased and Retired During Period, Value	$ (5)		(5)
Number of shares repurchased (in shares)	(150,000)
Shares, Outstanding, Ending Balance at Dec. 31, 2022		16,762,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity Attributable to Parent, Total	$ 572.1		28.5	576.8	(33.3)
Stockholders' Equity Attributable to Parent, Beginning Balance at Dec. 31, 2022	572.1		28.5	576.8	(33.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	107.7			107.7
APIC, Share-based Payment Arrangement, Increase for Cost Recognition			9
Performance share and restricted stock unit awards (in shares)		266,000
Performance share and restricted stock unit awards	(4.7)		(4.7)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	2.6				(2.6)
Stock Repurchased and Retired During Period, Value	$ (17.9)		(17.9)
Number of shares repurchased (in shares)	(543,000)
Shares, Outstanding, Ending Balance at Dec. 31, 2023		16,485,000
Common Stock, Value, Issued, Ending Balance at Dec. 31, 2023	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury Stock, Common, Shares	0
Treasury Stock, Value	$ 0
Stockholders' Equity Attributable to Parent, Total	668.8		14.9	684.5	(30.7)
Stockholders' Equity Attributable to Parent, Beginning Balance at Dec. 31, 2023	668.8		14.9	684.5	(30.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	196.3			196.3
APIC, Share-based Payment Arrangement, Increase for Cost Recognition			6
Performance share and restricted stock unit awards (in shares)		247,000
Performance share and restricted stock unit awards	(2.7)		(2.7)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	(3.8)				3.8
Treasury Stock, Shares, Acquired						(123,000)
Treasury Stock, Value, Acquired, Cost Method						$ (3.3)
Stock Repurchased and Retired During Period, Value	$ (10)		(6.7)
Number of shares repurchased (in shares)	(164,000)
Shares, Outstanding, Ending Balance at Dec. 31, 2024		16,568,000
Common Stock, Value, Issued, Ending Balance at Dec. 31, 2024	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury Stock, Common, Shares	(122,821)
Treasury Stock, Value	$ (3.3)
Stockholders' Equity Attributable to Parent, Total	$ 854.6		$ 11.5	$ 880.8	$ (34.5)

Consolidated Statements of St_2

Consolidated Statements of Stockholders' Equity Consolidated Statements of Stockholders' Equity (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pension and OPEB, Tax	$ (1.3)	$ 0.9	$ 3.1

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2024
Accounting Policies [Abstract]
Significant Accounting Policies	Summary of Significant Accounting Policies NATURE OF OPERATIONS AND BASIS OF PRESENTATION We are a premier manufacturer and supplier of bleached paperboard focused on servicing independent converters in North America. We also offer services that include customer sheeting, slitting, and cutting. Prior to the completion of the sale of our tissue business, we manufactured and sold consumer and parent roll tissues to major retailers, including grocery, club and discount stores. On May 1, 2024, we completed the acquisition of a paperboard manufacturing facility and associated business in Augusta, Georgia. See Note 3, "Business Acquisition," for more information about the acquisition. On November 1, 2024, we completed the sale of our tissue business. This represents a strategic shift in our operations and financial results requiring discontinued operations accounting treatment associated with this division. For all periods presented, the operating results associated with our tissue business have been reclassified to discontinued operations and have been shown as income (loss) from discontinued operations on our Consolidated Statements of Operations. The assets and liabilities associated with this business have been reflected as current and long-term assets and liabilities of discontinued operations in the Consolidated Balance Sheets. Additionally, certain reclassifications have been made to our continuing business to reflect certain intercompany transactions between our tissue business and our remaining entity such as treatment of intercompany sales and cost inputs. For the years ended December 31, 2023 and 2022, the impact of this reclassification was an increase to net sales of $76.7 million and $65.1 million and an increase to cost of sales of $77.5 million and $65.7 million. See Note 4, "Discontinued Operations," for more information on the divestiture. Unless the context otherwise requires or unless otherwise indicated, references in this report to “Clearwater Paper Corporation,” “we,” “our,” “the Company” and “us” refer to Clearwater Paper Corporation and its subsidiaries. All dollar amounts are shown in millions, except share and per share amounts. USE OF ESTIMATES The preparation of financial statements in conformity with accounting principles generally accepted in the U.S. requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of net sales and expenses during the reporting period. Actual results may differ from those estimates. PRINCIPLES OF CONSOLIDATION These consolidated financial statements include the financial condition and results of operations of Clearwater Paper Corporation and its wholly-owned subsidiaries. All intercompany transactions and balances between operations within the Company have been eliminated. Certain amounts have been reclassified from prior year presentation for consistency. BUSINESS COMBINATIONS We apply the principles provided in the Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) 805, Business Combinations , to determine whether an acquisition involves an asset or a business. In determining whether an acquisition should be accounted for as a business combination or asset acquisition, we first determine whether substantially all of the fair value of the gross assets acquired is concentrated in a single identifiable asset or a group of similar identifiable assets. If this is the case, the single identifiable asset or the group of similar assets is accounted for as an asset acquisition. If this is not the case, we then further evaluate whether the single identifiable asset or group of similar identifiable assets and activities includes, at a minimum, an input and a substantive process that together significantly contribute to the ability to create outputs. If so, the transaction is accounted for as a business combination. We account for business combinations using the acquisition method of accounting which requires that (i) identifiable assets acquired (including identifiable intangible assets) and liabilities assumed generally be measured and recognized at fair value as of the acquisition date and (ii) the excess of the purchase price over the estimated net fair value of identifiable assets acquired and liabilities assumed be recognized as goodwill, which is not amortized for accounting purposes but is subject to testing for impairment at least annually. We measure and recognize asset acquisitions that are not deemed to be business combinations based on the cost to acquire the assets. Goodwill is not recognized in an asset acquisition with any consideration in excess of net assets acquired allocated to acquired assets on a relative estimated fair value basis. Transaction costs are expensed in a business combination and transaction costs directly attributable to the acquisition are considered a component of the cost of the acquisition in an asset acquisition. See Note 3, "Business Acquisition," for additional information. DISCONTINUED OPERATIONS We present discontinued operations when there is a plan to dispose of a component of an entity or a group of components of an entity if the disposal represents a strategic shift that has (or will have) a major effect on an entity’s operations and financial results. In the period in which the component meets held-for-sale or discontinued operations criteria, the major assets and liabilities are reported as components of total assets and liabilities separate from those balances of the continuing operations. At the same time, the results of all discontinuing operations, less applicable income taxes, are reported as components of net income (loss) separate from the net income (loss) from continuing operations. Additionally, we have elected to allocate interest expense to discontinued operations related to debt that was not directly attributed to the division being disposed of. Interest expense was allocated based on a ratio of net assets of discontinued operations to the consolidated net assets plus consolidated debt. See Note 4, "Discontinued Operations," for further information. CASH AND CASH EQUIVALENTS We consider all highly liquid instruments with maturities of three months or less to be cash equivalents. ACCOUNTS RECEIVABLE Receivables consist of: December 31, 2024 2023 Trade accounts receivable $ 167.5 $ 85.2 Allowance for current expected credit losses (1.6) (1.2) Unbilled receivables 5.3 4.1 Taxes receivable 2.6 4.8 Other 15.0 3.1 $ 188.7 $ 96.1 INVENTORIES Our inventories are stated at the lower of net realizable value or current cost using the average cost method. December 31, 2024 2023 Logs, chips and sawdust $ 25.1 $ 22.1 Pulp 6.9 4.7 Paperboard products 123.4 77.4 Materials and supplies 102.5 57.0 $ 258.0 $ 161.2 PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment are stated at cost, including assets acquired under finance lease obligations, and any interest costs capitalized, less accumulated depreciation. Depreciation of buildings, equipment and other depreciable assets is determined using the straight-line method. Estimated useful lives generally range from 10 to 40 years for land improvements, 10 to 40 years for buildings and improvements and 2 to 25 years for machinery and equipment (includes office and other equipment). December 31, 2024 2023 Land and land improvements $ 65.8 $ 45.1 Buildings and improvements 232.4 179.4 Machinery and equipment 1,942.6 1,341.1 Construction in progress 87.6 43.0 Property, plant and equipment 2,328.4 1,608.6 Less accumulated depreciation and amortization (1,305.4) (1,247.9) Property, plant and equipment, net $ 1,023.1 $ 360.7 At December 31, 2024 and 2023, included within property, plant and equipment, net were finance leases of $8.6 million and $0.0 million and associated accumulated depreciation amounts of $0.3 million and $0.0 million. Depreciation expense is included in our financials as follows: For The Years Ended December 31, 2024 2023 2022 Continuing operations $ 67.7 $ 38.6 $ 38.5 Discontinued operations 30.0 57.9 62.6 Amortization of intangibles 2.1 2.1 2.1 $ 99.8 $ 98.6 $ 103.3 PLANNED MAINTENANCE We recognize the cost of repair and maintenance activities in the period in which the activity is performed or goods are consumed under the direct expense method. We perform planned maintenance activities at our facilities periodically and associated expenses are included in cost of sales. LEASES Operating lease right-of-use (ROU) assets and liabilities are recognized at the commencement date of a lease based on the present value of lease payments over the lease term. Our leases may include options to extend or terminate the lease. These options to extend are included in the lease term when it is reasonably certain that we will exercise that option. Some leases have variable payments: however, because they are not based on an index or rate, they are not included in the ROU assets and lease liabilities. Variable payments for real estate leases primarily relate to common area maintenance, insurance, taxes and utilities. Variable payments for equipment, vehicles, and leases within supply agreements primarily relate to usage, repairs and maintenance. As the implicit rate is not readily determinable for most of our leases, we apply a portfolio approach using an estimated incremental borrowing rate to determine the initial present value of lease payments over the lease terms on a collateralized basis over a similar term, which is based on market and company specific information. We use our unsecured borrowing rate and risk-adjust that rate to approximate a collateralized rate. Leases having a lease term of twelve months or less are not recorded on the balance sheet and the related lease expense is recognized on a straight-line basis over the term of the lease. In addition, we have applied the practical expedient to account for the lease and non-lease components as a single lease component for all of our leases. See Note 6, "Leases" for further information. ACCOUNTS PAYABLE AND ACCRUED LIABILITIES December 31, 2024 2023 Trade payables $ 164.6 $ 89.1 Accrued compensation 38.2 32.8 Operating lease liabilities 11.1 8.5 Taxes payable 50.8 1.2 Other 55.0 63.8 $ 319.7 $ 195.5 Included in accounts payable and other accrued liabilities is $25.8 million and $13.0 million related to capital expenditures that had not yet been paid as of December 31, 2024 and 2023. We maintain a program with a financial institution to provide our vendors with an option to receive payments earlier than our standard payment terms. Vendors receive payments directly from the financial institution . We are obligated to repay the financial institution in the next billing cycle which is generally 35 to 60 days later than payment to the supplier. Amounts under this program were included in "Other" in the table above and payments made under this program are reflected as cash outflows for operating activities in the Consolidated Statements of Cash Flows. The roll forward of our outstanding obligations confirmed as valid under the program were as follows: December 31, 2024 2023 Supplier finance program obligations balance, beginning of the year $ 14.7 $ 14.5 Invoice amounts added during the year 84.1 74.7 Invoice amounts paid during the year (86.1) (74.6) Supplier finance program obligations balance, end of year $ 12.7 $ 14.7 RETIREMENT PLANS AND POSTRETIREMENT BENEFITS We are required to use actuarial methods and assumptions in the valuation of defined benefit obligations and other postretirement obligations and the determination of expense. Differences between actual and expected results or changes in the values of the obligations and plan assets are not recognized in earnings as they occur but, rather, systematically and gradually over subsequent periods. See Note 12, "Retirement Plans and Postretirement Benefits," for further information. INCOME TAXES Income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the consolidated financial statement carrying amounts of existing assets and liabilities and their respective tax basis and operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. The determination of our provision for income taxes requires significant judgment, the use of estimates, and the interpretation and application of complex tax laws. Significant judgment is required in assessing the timing and amounts of deductible and taxable items and the probability of sustaining uncertain tax positions. The benefits of uncertain tax positions are recorded in our consolidated financial statements only after determining a more-likely-than-not probability that the uncertain tax positions will withstand challenge, if any, from tax authorities. When facts and circumstances change, we reassess these probabilities and record any changes in the consolidated financial statements as appropriate. See Note 8, "Income Taxes," for further information. REVENUE RECOGNITION We enter into contracts that can include various combinations of paperboard products, which are generally distinct and accounted for as separate performance obligations. Generally, revenue is recognized at a point in time upon transfer of control of promised products or services to customers in an amount that reflects the consideration we expect to receive in exchange for those products or services. Transfer of control typically occurs when the title and risk of loss passes to the customer. Shipping terms generally indicate when title and the risk of loss have passed, usually this is upon receipt at our customer's destination. We have elected to treat shipping and handling costs as a fulfillment cost. We expense incremental direct costs of obtaining a contract (sales commissions) when incurred because the amortization period is generally 12 months or less. We maintain consignment inventory at a limited number of customer locations. For consigned inventory, we recognize revenue upon transfer of control, which is often in advance of invoicing the customer. These amounts are classified as unbilled receivables in the above detail of accounts receivable. We provide for trade promotions, customer cash discounts and other deductions, which are considered variable consideration and recorded as a reduction to net sales. Returns and credits are estimated at contract inception and updated at the end of each reporting period as additional information becomes available. Revenue, net of returns and credits, is only recognized to the extent that it is probable that a significant reversal of any incremental revenue will not occur. Judgment associated with forecasted volumes is required to determine the most probable amount of variable consideration to apply as a reduction to net sales. Revenue is recognized net of any taxes collected from customers. For more information on the disaggregation of revenue by primary geographical market and major product line, see Note 18, "Segment Disclosure." OTHER OPERATING CHARGES, NET We classify significant amounts unrelated to ongoing core operating activities as “Other operating charges, net” in the Consolidated Statements of Operations. Such items include, but are not limited to, amounts related to facility closures and related gain (loss) on sale and impairment, restructuring charges (including severance charges), charges to establish and maintain litigation or environmental reserves, gains or losses from settlements with governmental or other organizations, acquisition, integration and divestiture related costs and cash settled equity-based compensation to our directors. Due to the nature of these items, amounts in the statement of operations can fluctuate from year to year. The determination of which items are considered significant and unrelated to core operations is based upon management’s judgment. See Note 10, "Other Operating Charges, net" for a discussion of specific amounts in 2024, 2023 and 2022. ACCOUNTS RECEIVABLE ARRANGEMENT Prior to the sale of our tissue business, we maintained an uncommitted supply-chain financing program with a global financial institution. Under this program, a specific customer's trade accounts receivable may be acquired, without recourse, by the institution at a discounted rate. For the years ended December 31, 2024 and 2023, we sold $261.6 million and $257.5 million of receivables. The proceeds from these sales of receivables are included within operating activities in our Consolidated Statements of Cash Flows. For the years ended December 31, 2024, 2023, and 2022 factoring expense on the sale of receivables was $3.4 million, $3.7 million, and $1.8 million and was included Selling, general and administrative expense within our Income (loss) from discontinued operations in our Consolidated Statements of Operations. ENVIRONMENTAL AND ASSET RETIREMENT OBLIGATIONS We estimate our environmental and asset retirement obligations based on various assumptions and judgments, the specific nature of which varies in light of the particular facts and circumstances surrounding each liability. These estimates typically reflect assumptions and judgments as to the probable nature, magnitude and timing of required investigation, remediation and monitoring activities and the probable cost of these activities. We have accrued only for specific costs related to environmental matters that we have determined are probable and for which an amount can be reasonably estimated. For asset retirement obligations, the liability is accreted to its settlement value and, where appropriate, the capitalized cost is depreciated over the useful life of the related asset. Upon settlement of the liability, we recognize a gain or loss for any difference between the settlement amount and the liability recorded. Our asset retirement obligation is included in "Deferred tax liabilities and other long-term obligations" in the Consolidated Balance Sheets. Our asset retirement obligation reflects the estimated present value of our obligations for capping, closure and post closure cost with respect to landfills, asbestos remediation and other ongoing environmental monitoring. The following table represents the activity associated with our asset retirement obligations. December 31, 2024 2023 Beginning balance $ 2.0 $ 1.9 Liabilities acquired 2.9 — Accretion expense 0.2 0.1 Payments (0.1) (0.1) Ending balance $ 5.0 $ 2.0 TREASURY STOCK Under our 2024 stock repurchase authorization, we repurchase shares of common stock and such shares are recorded at cost as treasury stock and result in a reduction of shareholders' equity in the Consolidated Balance Sheets. We use the weighted-average cost method for determining the cost of shares reissued. The difference between the cost of the treasury shares and the reissuance value is added to or deducted from additional paid-in capital. If additional paid in capital is exhausted, amounts will be deducted directly from retained earnings upon reissuance.

Recently Adopted and New Accoun

Recently Adopted and New Accounting Standards	12 Months Ended
	Dec. 31, 2024
Accounting Standards Update and Change in Accounting Principle [Abstract]
New Accounting Pronouncements, Policy	Recently Adopted and New Accounting Standards RECENTLY ADOPTED In November 2023, the FASB issued ASU No. 2023-07, Segment Reporting—Improvements to Reportable Segment Disclosures (Topic 280) . This standard requires enhanced disclosures of segment expenses as well as additional information provided to the Chief Operating Decision Maker. This ASU is effective for annual periods beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. The amendments in this ASU should be applied retrospectively to all prior periods presented in the financial statements. Early adoption is permitted. We adopted this new standard on January 1, 2024. See Note 18, "Segment Disclosure," for additional information. The adoption of this standard did not have a material impact on our financial statements. NEW ACCOUNTING STANDARDS In November 2024, the FASB issued ASU 2024-03, Disaggregation of Income Statement Expenses (Subtopic 220-40) , which requires disaggregated disclosure of certain types of expenses, such as inventory purchases, employee compensation, depreciation, and amortization in commonly presented expense captions such as cost of revenue and selling, general and administrative expenses. This ASU is effective for fiscal years beginning after December 15, 2026, and interim periods within fiscal years beginning after December 15, 2027. Early adoption is permitted. We are currently evaluating the impact this new standard will have on our consolidated financial statement disclosures. In December 2023, the FASB issued ASU No. 2023-09, Income Taxes—Improvements to Income Tax Disclosures (Topic 740) , which requires enhanced disclosures primarily related to the rate reconciliation and disaggregation of income taxes paid. This ASU is effective for annual periods beginning after December 15, 2024, with early adoption permitted. Adoption of this ASU will result in additional disclosure, but it will not impact our consolidated financial position, results of operations or cash flows.

Business Combinations, Asset Ac

Business Combinations, Asset Acquisitions, and Joint Venture Formation	12 Months Ended
	Dec. 31, 2024
Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]
Business Combination Disclosure	Business Acquisition On May 1, 2024, we completed the acquisition of a paperboard manufacturing facility and associated business, located in Augusta, Georgia (Augusta) from Graphic Packaging International, LLC (Augusta Acquisition). The acquisition is being accounted for under Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) 805, Business Combinations as a business combination as opposed to an asset acquisition. We used borrowings under our credit facilities to fund the acquisition. This acquisition strengthened our position as a premier, independent supplier of paperboard products to converters through improved scale and cost structure. The purchase price of the Augusta Acquisition was allocated to assets acquired and liabilities assumed based on the estimated fair values as of the date of acquisition. The excess of the purchase price over the fair value of the net assets acquired was allocated to goodwill, which is expected to be deductible for tax purposes. The allocation of the purchase price shown below remains preliminary and is subject to further adjustment, pending additional refinement and final completion of valuations, including but not limited to valuations of property, plant and equipment. Goodwill is primarily attributed to synergies from future expected economic benefits, including enhanced revenue growth as well as cost savings from reduction of duplicative overhead, streamlined operations and enhanced operational efficiency. The purchase price allocation as of December 31, 2024 is as follows: Original Purchase Price Allocation Measurement Period Adjustments Updated Purchase Price Allocation Purchase price $ 708.2 $ — $ 708.2 Inventories, net 102.8 — 102.8 Other current assets 0.4 (0.1) 0.4 Property, plant and equipment 609.3 1.0 610.3 Other assets, net 11.8 — 11.8 Total assets acquired 724.3 0.9 725.2 Current portion of long-term debt (0.6) — (0.6) Accounts payable and accrued liabilities (7.7) (0.8) (8.5) Long-term debt (8.9) — (8.9) Other long-term obligations (12.6) — (12.6) Total liabilities assumed (29.7) (0.8) (30.5) Net assets acquired 694.5 0.1 694.7 Goodwill 13.7 (0.1) 13.6 Total estimated fair value of net assets acquired $ 708.2 $ — $ 708.2 As reflected in the above table, we updated the purchase price allocation related to Augusta Acquisition based on third-party valuation reports we received. As a result, we updated the fair value of property, plant and equipment acquired and made other insignificant updates, with a corresponding change to goodwill. The Consolidated Statement of Operations includes $341.3 million of Net Sales and $27.0 million of Net Loss for the twelve months ended December 31, 2024 associated with this acquisition. The following unaudited pro forma consolidated financial information for the twelve ended December 31, 2024 combines our results and the unaudited results of the Augusta operations for the corresponding periods. The unaudited pro forma consolidated financial information assumes that the Augusta Acquisition, which closed on May 1, 2024, was completed on January 1, 2023. The pro forma consolidated financial information has been calculated after applying our accounting policies and includes adjustments to reduce previously recorded amortization expense, fair value adjustments for acquired inventory, property, plant and equipment and operating leases. The impact to depreciation expense was de minimis due to the valuation step up being offset by increased useful lives. These pro forma results have been prepared for comparative purposes only and do not purport to be indicative of our operating results that would have been achieved had the Augusta Acquisition actually taken place on January 1, 2023. In addition, these results are not intended to be a projection of future results and do not reflect events that may occur after the Augusta Acquisition, including but not limited to revenue enhancements, cost savings or operating synergies that we may achieve as a result of the Augusta Acquisition. For The Years Ended December 31, (Unaudited) 2024 2023 Net sales $ 1,572.4 $ 1,750.8 Net income 183.0 124.1

Discontinued Operations and Dis

Discontinued Operations and Disposal Groups	12 Months Ended
	Dec. 31, 2024
Discontinued Operations and Disposal Groups [Abstract]
Disposal Groups, Including Discontinued Operations, Disclosure	Discontinued Operations On November 1, 2024, we completed the sale of our tissue business to Sofidel America Corp. The purchase price was $1.06 billion in cash, subject to adjustments for working capital, indebtedness and transaction expenses. We recorded a gain on sale of $307.2 million. The gain and cash proceeds are subject to customary working capital adjustments during a specified period following the close of the sale. We have estimated the preliminary non-cash working capital adjustment of $13.1 million, which is excluded from "Proceeds from business divestiture" within Investing Activities on the Consolidated Statement of Cash Flows for the year ended December 31, 2024. Below is a reconciliation of line items constituting pre-tax income from discontinued operations to the after-tax income from discontinued operations as reported on our Consolidated Statement of Operations: For The Years Ended December 31, 2024 2023 2022 Net sales $ 870.3 $ 1,023.4 $ 950.2 Cost of sales 733.0 892.6 906.0 Selling, general and administrative expenses 26.2 29.4 23.0 Other operating charges, net 14.4 2.4 6.6 Income from discontinued operations 96.7 99.1 14.6 Non-operating expense (23.4) (20.5) (23.4) Income (loss) from discontinued operations before income taxes 73.3 78.6 (8.8) The major components of “Other operating charges, net” included in discontinued operations for the years ended December 31, 2024, 2023 and 2022 are reflected in the table below. These items are considered outside of our core discontinued operations. For The Years Ended December 31, 2024 2023 2022 Divestiture related costs $ 12.7 $ — $ — Costs associated with mill closure — — 0.3 Loss on sale or impairment associated with assets 0.4 2.4 4.7 Business improvement and other expenses 1.3 — 1.6 $ 14.4 $ 2.4 $ 6.6 The carrying amounts of major components of assets and liabilities included as part of discontinued operations are as follows: December 31, 2023 Assets of discontinued operations: Receivables, net of allowance for current expected credit losses $ 88.4 Inventories, net 158.6 Other current assets 0.5 Property, plant and equipment, net 629.4 Other assets, net 28.5 Total assets of discontinued operations 905.4 Liabilities of discontinued operations: Current portion of long-term debt 0.8 Accounts payable and accrued liabilities 89.6 Long-term debt 22.4 Liability for pension and other postretirement employee benefits 1.2 Deferred tax liabilities and other long-term obligations 114.5 Total liabilities of discontinued operations 228.6 Net assets of discontinued operations $ 676.8 Operating and investing cash flows of the discontinued operation are presented in the following table: Twelve Months Ended December 31, 2024 2023 2022 Net cash provided by operating activities of discontinued operations $ 143.7 $ 121.3 $ 68.9 Net cash used in investing activities of discontinued operations (11.4) (18.8) (8.0) In connection with the divestiture, we entered into a Lease Agreement to lease the portion of the land and building on which our tissue business operated at the Lewiston, Idaho facility. The lease term shall be five years with certain renewal rights for a maximum of ten years. The lease was determined to be at below market rates and correspondingly a portion of the gain was deferred and will be amortized over the expected lease period (see Note 6). Additionally, we entered into a Services and Use Agreement which we will provide certain services in connection with the ongoing operations at the buyer's manufacturing facilities located in Lewiston, Idaho. We are operating under a Transition Services Agreement with the buyer to provide certain back office services (accounting and IT support) until October 31, 2025. Included in the Consolidated Balance Sheet at December 31, 2024 are $2.7 million in accounts receivable.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2024
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements Fair value measurements and disclosure requirements establish a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three levels. Level 1 inputs, the highest priority, are quoted prices in active markets for identical assets or liabilities. Level 2 inputs reflect other than quoted prices included in level 1 that are either observable directly or through corroboration with observable market data. Level 3 inputs are unobservable inputs due to little or no market activity for the asset or liability, such as internally-developed valuation models. Carrying amounts reported on the consolidated balance sheets for cash and cash equivalents, receivables and accounts payable approximate fair value due to the short-term maturity of these instruments. See discussion on fair market values for long-term debt included within Note 9, "Debt." We review the carrying amounts of goodwill and long-lived assets to be held and used for impairment wherever events or changes in circumstances indicate possible impairment. An impairment loss is recognized when a long-lived asset's carrying amount is not recoverable and exceeds estimated fair value. See Note 7, "Goodwill and Intangible Assets" for discussion of fair market values for goodwill.

Leases

Leases	12 Months Ended
	Dec. 31, 2024
Leases [Abstract]
Lessee, Operating Leases	Leases We have operating leases for manufacturing, office, equipment and vehicles. Our leases have remaining lease terms from less than one COMPONENTS OF LEASE EXPENSE For The Years Ended December 31, 2024 2023 2022 Operating lease costs $ 12.9 $ 9.4 $ 8.3 Finance lease costs: Amortization of ROU assets 0.3 — — Interest on lease liabilities 0.5 — — Total finance lease costs 0.8 0.0 0.0 Variable lease costs 0.5 0.3 0.3 Total lease costs $ 14.2 $ 9.7 $ 8.6 SUPPLEMENTAL BALANCE SHEET INFORMATION December 31, Balance Sheet Caption 2024 2023 Lease ROU assets Operating lease assets Other assets, net $ 39.1 $ 31.7 Finance lease assets, net Property, plant and equipment, net $ 8.3 $ — Lease Liabilities Current operating lease liabilities Accounts payable and accrued liabilities $ 11.1 $ 8.5 Current finance lease liabilities Current portion of long-term debt $ 0.6 $ — Non-current operating lease liabilities Deferred tax liabilities and other long-term obligations $ 28.3 $ 24.2 Non-current finance lease liabilities Long-term debt $ 8.4 $ — Total operating lease liabilities $ 39.4 $ 32.7 Total finance lease liabilities $ 9.1 $ — LEASE TERM AND DISCOUNT RATE December 31, 2024 2023 Weighted average remaining lease term (years) Operating leases 4.3 4.1 Finance leases 12.3 0.0 Weighted average discount rate Operating leases 6.5 % 6.1 % Finance leases 7.4 % — % SUPPLEMENTAL CASH FLOW INFORMATION The table below includes lease information for both continuing and discontinued operations. For The Years Ended December 31, 2024 2023 2022 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 20.7 $ 19.6 $ 19.7 Operating cash flows from finance leases 1.6 2.0 2.1 Financing cash flows from finance leases 1.1 0.9 1.1 Non-cash amounts for lease liabilities arising from obtaining ROU assets: Operating leases $ 3.5 $ 32.7 $ 6.4 Finance leases — — 4.2 Operating leases assumed on business acquisition 14.5 — — Finance leases assumed on business acquisition 8.6 — — MATURITY OF LEASE LIABILITIES As of December 31, 2024, our future maturities of lease liabilities were as follows: Operating Finance 2025 $ 13.2 $ 1.3 2026 11.6 1.3 2027 9.1 1.3 2028 4.5 1.2 2029 2.5 1.2 Thereafter 4.5 7.7 Total lease payments 45.4 13.9 Less imputed interest (6.0) (4.8) Present value of lease liabilities $ 39.4 $ 9.1 As discussed in Note 4, "Discontinued Operations," we entered into a Lease Agreement associated with the sale of our tissue operations. This lease is included in "Accounts payable and accrued liabilities" and "Deferred tax liabilities and other long-term obligations" on our Consolidated Balance Sheets. The maturity analysis of lease income associated with the agreement as of December 31, 2024 is as follows: Total 2025 $ 4.8 2026 4.4 2027 4.0 2028 3.6 2029 3.3 Thereafter 12.1 Total $ 32.1

Goodwill and Intangible Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Intangible Assets Changes in the carrying amounts of goodwill and intangible assets were as follows: Goodwill Intangibles - Customer Relationship Total Balance as of December 31, 2022 $ 35.1 $ 8.6 $ 43.6 Amortization — (2.1) (2.1) Balance as of December 31, 2023 35.1 6.4 41.5 Recognized goodwill 1 13.6 — 13.6 Amortization — (2.1) (2.1) Balance as of December 31, 2024 $ 48.6 $ 4.3 $ 52.9 1 Goodwill recognized from the Augusta acquisition. See Note 3, "Business Acquisition," for additional information. The intangible assets associated with customer relationships are amortized over their useful lives of 10 years. We annually evaluate goodwill for possible impairment as of November 1 with additional interim evaluation performed when management believes that it is more likely than not that events or circumstances have occurred that would result in the impairment of a reporting unit’s goodwill. We evaluate our intangible assets for impairment when events or changes in circumstances indicate that the carrying value may not be recoverable. The gross book value and accumulated amortization of definite lived intangible assets at December 31, 2024 was $34.9 million and $30.6 million. The gross book value and accumulated amortization of definite lived intangible assets at December 31, 2023 was $34.9 million and $28.4 million. As of December 31, 2024, estimated future amortization expense related to intangible assets is as follows: Amount 2025 $ 2.1 2026 2.1 2027 — 2028 — 2029 — Total $ 4.3

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2024
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes INCOME TAX PROVISION (BENEFIT) The components of income tax provision (benefit) from continuing operations is comprised of the following: For The Years Ended December 31, 2024 2023 2022 Current Federal $ (73.9) $ 17.4 $ 19.8 State (1.1) 3.0 1.9 Total current (75.0) 20.5 21.7 Deferred Federal 50.9 (3.7) 3.2 State (3.0) 0.1 4.3 Total deferred 47.9 (3.6) 7.5 Income tax provision (benefit) $ (27.1) $ 16.9 $ 29.2 The income tax provision (benefit) from continuing operations differs from the amount computed by applying the statutory federal income tax rate to income (loss) before income taxes due to the following: For The Years Ended December 31, 2024 % 2023 % 2022 % Tax at the statutory rate $ (21.2) 21.0 % $ 13.8 21.0 % $ 17.2 21.0 % State and local taxes, net of federal income tax impact (4.5) 4.5 % 2.6 4.0 % 3.2 3.9 % Adjustment for state deferred tax rate 1 (0.1) 0.1 % (0.2) (0.2) % (4.7) (5.7) % Federal credits 2 (3.0) 3.0 % (1.0) (1.6) % 7.5 9.2 % Uncertain tax positions 0.1 (0.1) % 2.2 3.3 % (0.6) (0.7) % Non-deductible expenses 0.7 (0.7) % 1.3 1.9 % 1.6 1.9 % Change in valuation allowances 1 0.4 (0.4) % (0.7) (1.1) % 4.2 5.1 % Other, net 0.6 (0.6) % (1.0) (1.5) % 0.6 0.8 % Income tax provision (benefit) $ (27.1) 26.8 % $ 16.9 25.8 % $ 29.2 35.5 % 1 In 2022, Idaho revised their state income tax rate. Given our expected utilization, we recorded an offset to our valuation allowances for the amount of this reduction. 2 In 2022, we adjusted our tax positions under audit related to the disallowance of a previously taken federal tax credits based upon interpretation of the law. DEFERRED TAXES The tax effects of significant temporary differences creating deferred tax assets and liabilities at December 31 were: 2024 2023 Deferred tax assets: Employee benefits $ 2.2 $ 2.1 Postretirement employee benefits 11.4 13.0 Incentive compensation 2.6 3.7 Inventories 5.2 0.9 Pensions 0.9 — Federal and state credit carryforwards 9.6 8.6 Federal and state net operating losses 1.0 1.4 Operating leases 6.9 8.1 Capitalized research credits 10.7 4.4 Other 1.7 — Total deferred tax assets 52.1 42.2 Valuation allowance (8.0) (7.6) Deferred tax assets, net of valuation allowance 44.2 34.6 Deferred tax liabilities: Property, plant and equipment, net (124.6) (59.0) Operating leases (6.8) (7.9) Pensions — (0.5) Intangible assets, net — (1.3) Other (0.7) (1.2) Total deferred tax liabilities (132.1) (69.8) Net deferred tax liabilities $ (88.0) $ (35.2) Net deferred tax assets (liabilities) consist of: December 31, 2024 2023 Non-current deferred tax assets 1 $ 1.7 $ 0.8 Non-current deferred tax liabilities (89.7) (36.0) Net deferred tax liabilities $ (88.0) $ (35.2) 1 Included in "Other assets, net" on our accompanying December 31, 2024 and 2023 Consolidated Balance Sheets. We have tax benefits associated with state jurisdictions totaling $2.6 million which expire between 2025 and 2038. UNCERTAIN TAX POSITIONS The following table provides a roll forward of our unrecognized tax benefits. For The Years Ended December 31, 2024 2023 2022 Beginning balance $ 80.9 $ 70.4 $ 5.9 Increases: Tax position taken in current year 0.9 0.4 68.6 Tax position taken in prior years — 10.4 (0.1) Decreases: Settlements during the year — (0.3) (3.1) Tax position taken in prior years (78.4) — — Lapse of statutes in current year (1.0) — (0.9) Ending balance $ 2.4 $ 80.9 $ 70.4 During 2022, we ceased operations in our wholly owned subsidiary, Cellu Tissue Holdings, Inc. and recorded a $68.4 million reserve for an estimated uncertain tax position relating to a worthless stock deduction for our investment which represented a full reserve of the tax effects of that position. During 2023, an additional $10.4 million was recorded as a reserve for uncertain tax positions relating to state income tax effects of the worthless stock deduction. During the year ended December 31, 2023, we filed our U.S. 2022 tax return reflecting this position and requested a tax refund which was generated primarily due to the worthless stock deduction. Prior to December 31, 2023, we received this refund. In 2023, we requested a ruling from the IRS in connection with the worthless stock deduction and expect a determination in 2025. Due to the sale of our tissue operations during 2024, we have determined that it is more likely than not that we will sustain the value of the worthless stock deduction either as recorded or as a capital gain. We continue discussions with the IRS on this deduction. Based upon this conclusion, we have removed the uncertain tax position and reversed any associated interest with this position. We have operations in many states within the U.S. and are subject, at times, to tax audits in these jurisdictions. During 2023, we effectively settled federal tax years 2015 through 2019, however such years remain subject to exam until the U.S. federal exam is formally closed. With a few exceptions, we are no longer subject to state and local tax examination for years prior to 2018.

Debt

Debt	12 Months Ended
	Dec. 31, 2024
Debt Disclosure [Abstract]
Debt	Debt Long-term debt at the balance sheet dates consisted of: December 31, 2024 December 31, 2023 Interest Rate at Principal Unamortized Debt Costs Total Principal Unamortized Debt Costs Total PCA Credit Agreement (term revolver) maturing 2029, fixed interest rate —% $ — $ — $ — $ 150.0 $ (2.8) $ 147.2 2020 Notes, maturing 2028, fixed interest rate 4.75% 275.0 (1.8) 273.2 275.0 (2.4) 272.6 ABL Credit Agreement (revolving loan), maturing 2027, variable interest rate —% — — — 20.0 — 20.0 Finance leases 9.1 — 9.1 — — — Total debt 284.1 (1.8) 282.2 445.0 (5.1) 439.9 Less: current portion (0.6) — (0.6) — — — Net long-term portion $ 283.4 $ (1.8) $ 281.6 $ 445.0 $ (5.1) $ 439.9 Deferred debt costs are amortized over the life of the related debt using a straight-line basis which approximates the effective interest method. Deferred debt costs associated with our Credit Agreements are recorded within "Other assets, net" on our Consolidated Balance Sheets. The fair value of our debt as of December 31 is included in the following table: 2024 2023 2020 Notes, maturing 2028, fixed interest rate $ 258.9 $ 255.1 PCA Credit Agreement, maturing 2029, fixed interest rate — 150.6 Revolving credit facility, maturing 2027, variable interest rate — 20.0 $ 258.9 $ 425.7 PCA CREDIT AGREEMENT On May 1, 2024, we entered into the PCA Credit Agreement with the lenders party thereto and AgWest Farm Credit, PCA, as administrative agent. The PCA Credit Agreement amended and restated our prior credit agreement dated as of October 27, 2023 with the lenders party thereto and AgWest Farm Credit, PCA as administrative agent. The PCA Credit Agreement consists of a term revolver commitment of $270 million and initially, also included two term loans in the original outstanding aggregate principal amount of $490 million. During 2024, drawn balances on these two term loans were fully repaid. We may increase term revolver commitments under the PCA Credit Agreement in an aggregate amount of up to $60 million, subject to obtaining commitments from any participating lenders and certain other conditions. The term revolver commitment under the PCA Credit Agreement is subject to an annual reduction of 2% of the commitments then in effect. The PCA Credit Agreement matures on May 1, 2029, subject to a springing maturity beginning on the date that is 91 days prior to the maturity of the Company’s 2020 Notes if the outstanding principal amount of the 2020 Notes plus $50 million is at any time during such 91 day period greater than the sum of our available borrowing liquidity and unrestricted cash. We may prepay and reborrow any borrowings under the PCA Credit Agreement, in whole or in part, at any time and from time to time without premium or penalty (except in certain circumstances). In addition, we must make mandatory prepayments of principal under the PCA Credit Agreement upon the occurrence of certain asset sales. Under the PCA Credit Agreement, loans generally may bear interest based on SOFR or the administrative agent’s fixed rate, as applicable, plus, in each case, an applicable margin of 3.65% per annum. We may receive patronage dividends under the PCA Credit Agreement. Patronage dividends are distributions of profits from banks in the farm credit system. Patronage dividends, which are generally made in cash, are accrued as earned and recorded as a reduction to interest expense. The PCA Credit Agreement contains certain customary representations, warranties, and affirmative and negative covenants of us and our subsidiaries that restrict us and our subsidiaries’ ability to take certain actions, including, incurrence of indebtedness, creation of liens, mergers or consolidations, dispositions of assets, repurchase or redemption of capital stock and certain types of indebtedness, making certain investments, entering into certain transactions with affiliates or changing the nature of our business. At December 31, 2024, we were in compliance with the PCA Credit Agreement. Our ability to utilize our PCA Credit Agreement could be limited in the future by the bond indenture governing our 2020 Notes, which has limitations on the incurrence of liens. ABL CREDIT AGREEMENT Our ABL Credit Agreement matures on November 7, 2027. After giving effect to an amendment on May 1, 2024 with JPMorgan Chase Bank, N.A., as administrative agent and several lenders, the revolving loan commitment under the ABL Credit Agreement was increased from $275 million to $375 million, subject to borrowing base limitations based on a percentage of applicable eligible receivables and eligible inventory. We may also increase commitments under the ABL Credit Agreement in an aggregate principal amount of up to $100 million, subject to obtaining commitments from any participating lenders and certain other conditions. Based upon our Consolidated Balance Sheets as of December 31, 2024, our eligible receivables and inventory supported up to $221.3 million availability under the line, of which $3.7 million was utilized to issue letters of credit. We may, at our option, prepay any borrowings under the ABL Credit Agreement, in whole or in part, at any time and from time to time without premium or penalty (except in certain circumstances). Borrowings under the ABL Credit Agreement are also subject to mandatory prepayment in certain circumstances, including in the event that borrowings exceed applicable borrowing base limits. Under the ABL Credit Agreement, loans may bear interest based on SOFR (secured overnight financing rate) or an annual base rate, as applicable, plus, in each case, an applicable margin that is based on availability, as calculated under the ABL Credit Agreement that may vary from 1.25% per annum to 1.75% per annum in the case of SOFR loans and 0.25% per annum to 0.75% per annum in the case of annual base rate loans. In addition, a commitment fee based on unused availability is also payable which may vary from 0.25% per annum to 0.375% per annum. The ABL Credit Agreement contains certain customary representations, warranties, and affirmative and negative covenants of us and our subsidiaries that restrict us and our subsidiaries' ability to take certain actions, including, incurrence of indebtedness, creation of liens, mergers or consolidations, dispositions of assets, repurchase or redemption of capital stock and certain types of indebtedness, making certain investments, entering into certain transactions with affiliates or changing the nature of our business. The agreement also contains a financial covenant, which requires us to maintain a consolidated fixed charge coverage ratio of not less than 1.10x to 1.00x, provided that the financial covenant under the ABL Credit Agreement is only applicable during an event of default or if availability, as calculated under the ABL Credit Agreement, is at any time less than or equal to the greater of (i) 10% of the Line Cap and (ii) $25 million. As of December 31, 2024, our fixed charge coverage ratio was approximately 2.0x. Our ability to utilize our ABL Credit Agreement could be limited in the future by our bond indenture governing our 2020 Notes which has limitations on the incurrence of liens. 2020 NOTES In 2020, we issued $275 million aggregate principal amount of senior notes (2020 Notes) due August 15, 2028 with an interest rate of 4.75%. The 2020 Notes are unsecured and effectively subordinated to all of the Company’s existing and future secured debt, including borrowings under its existing credit facilities. The 2020 Notes are guaranteed on an unsecured basis by each of the Company’s existing direct and indirect domestic subsidiaries, and will be guaranteed by each of the Company’s future direct and indirect domestic subsidiaries, subject to certain exceptions. If the Company is unable to make payments on the 2020 Notes when they are due, each Guarantor is obligated to make such payments. The 2020 Notes indenture contains covenants that, among other things, limit our ability and the ability of any of our subsidiaries to (i) enter into sale leaseback transactions, (ii) incur liens and (iii) consolidate, merge or sell all or substantially all of our assets. In addition, the 2020 Notes indenture requires, among other things, we provide certain reports to holders of the 2020 Notes. These covenants are subject to a number of exceptions, limitations and qualifications as set forth in the 2020 Notes indenture.. We may redeem all or a portion of the 2020 Notes at specified redemption prices plus accrued and unpaid interest. In addition, we may be required to make an offer to purchase the 2020 Notes upon the sale of certain assets and upon a change in control. SCHEDULED PAYMENTS As of December 31, 2024, our future maturities of long term debt over the next five years are $275 million due 2028.

Other Operating Charges, net

Other Operating Charges, net	12 Months Ended
	Dec. 31, 2024
Other Income and Expenses [Abstract]
Other Operating Charges, net	Other Operating Charges, net The major components of “Other operating charges, net” in the Consolidated Statements of Operations are: Years Ended December 31, 2024 2023 2022 Acquisition related costs $ 14.1 $ 1.9 $ — Integration costs 8.0 — — Loss on sale or impairment associated with assets 1.5 0.1 1.5 Directors' equity-based compensation expense (0.4) 0.9 0.9 Other 0.8 0.3 0.7 $ 24.0 $ 3.2 $ 3.2 2024 During 2024, we recorded $24.0 million of expense in "Other operating charges, net." The main components of the expense include: • expense of $14.1 million associated with acquisition activities (primarily legal and professional services); • expense of $8.0 million associated with integration activities (primarily professional services); • loss of $1.5 million associated with the impairment of equipment and related spare parts no longer being used; and • reversal of expense of $0.4 million relating to directors' equity-based compensation which is remeasured each period based upon changes in our stock price. 2023 During 2023, we recorded $3.2 million expense in "Other operating charges, net." The components of the expense include: • expense of $1.9 million related to acquisition activities and other expenses including consulting and legal fees associated with our efforts to achieve long-term performance improvements; • loss of $0.1 million associated with the impairment of fixed assets; and • expense of $0.9 million relating to directors' equity-based compensation which is remeasured each period based upon changes in our stock price. 2022 During 2022, we recorded $3.2 million of expense in "Other operating charges, net." The components of the expense include: • loss of $1.5 million associated with the impairment of fixed assets; and • expense of $0.9 million relating to directors' equity-based compensation which is remeasured each period based upon changes in our stock price.

Non Operating Income and Expens

Non Operating Income and Expenses	12 Months Ended
	Dec. 31, 2024
Other Income and Expenses [Abstract]
Other Nonoperating Income and Expense	The major components of “Non-operating expense” in the Consolidated Statements of Operations are: Years Ended December 31, 2024 2023 2022 Interest expense $ (32.0) $ (11.8) $ (11.7) Capitalized interest 1.6 0.3 0.1 Amortization of debt issuance costs and accretion of debt discount (1.7) (0.5) (0.6) Interest income 2.9 2.4 1.0 Interest expense, net (29.2) (9.5) (11.2) Debt retirement costs (9.1) (3.1) (0.5) Non-operating pension and other postretirement employee benefits income (expense) 1.8 0.1 (5.7) Total non-operating expense $ (36.6) $ (12.5) $ (17.4)

Savings, Pension and Other Post

Savings, Pension and Other Postretirement Employee Benefit Plans	12 Months Ended
	Dec. 31, 2024
Retirement Benefits [Abstract]
Savings, Pension and Other Postretirement Employee Benefit Plans	Retirement Plans and Postretirement Benefits Certain of our employees are eligible to participate in defined contribution savings and defined benefit postretirement plans. These include 401(k) savings plans, defined benefit pension plans including company-sponsored and multiemployer plans, and other postretirement employee benefit (OPEB) plans. 401(k) Savings Plans Substantially all of our employees are eligible to participate in 401(k) savings plans, which include a company match component. As of December 31, 2024 our contributions may be up to 7.7% for U.S. salaried and non-union hourly employees, consisting of a match of up to 4.2% of allowable contributions and an automatic employer contribution of 3.5%. Contributions associated with our union employees are based upon negotiated agreements. In 2024, 2023 and 2022, we recorded expense of $18.9 million, $16.7 million, and $15.7 million related to employer contributions to the 401(k) plans, included in these amounts are $7.6 million, $8.2 million and $7.9 million related to discontinued operations. Company-Sponsored Defined Benefit Pension and OPEB Plans A portion of our salaried and hourly employees are covered by company-sponsored noncontributory defined benefit pension plans. We provide retiree health care and life insurance plans, which cover certain salaried and hourly employees. Retiree health care benefits for Medicare eligible participants over the age of 65 are provided through Health Reimbursement Accounts, or HRA's. Benefits for retirees under the age of 65 are provided under our company-sponsored health care plans, which require retiree contributions and contain other cost-sharing features. The retiree life insurance plans are primarily noncontributory. We also maintain a Salaried Supplemental Benefit Plan, an unfunded, non-qualified defined benefit plan intended to provide supplemental retirement benefits to certain executives. Benefits in the Salaried Supplemental Benefit Plan are generally provided to restore benefits or company contributions that are reduced under the company sponsored qualified plans due to the limits of Section 401(a)(17) or 415 of the Code. The plan is composed of a defined benefit portion and a defined contribution portion. The defined benefit portion of the plan was frozen on December 31, 2011 (the date on which all benefit accruals under the Salaried Retirement Plan were frozen) and as of December 31, 2024, we had one active employee under this portion. We paid benefits of $0.5 million associated with the defined benefit portion of the plan in 2024. The defined contribution portion of this liability totaled $2.6 million and $2.3 million at December 31, 2024 and 2023. The current and long-term portions of the liability are included in “Accounts payable and accrued liabilities” and “Deferred tax liabilities and other long-term obligations” on our Consolidated Balance Sheets. The defined benefit portion is included in the pension benefit plans tables below. Pension and Other Postretirement Employee Benefit Plans The following table shows the changes in the benefit obligation, plan assets and funded status for 2024 and 2023 for both the pension benefit plans and the other postretirement employee benefit plans. Pension Benefit Plans Other Postretirement 2024 2023 2024 2023 Change in projected benefit obligation: Benefit obligation at beginning of year $ 228.3 $ 234.7 $ 51.3 $ 50.9 Service cost 2.5 3.5 0.2 0.2 Interest cost 11.9 12.5 2.5 2.8 Plan changes — — 0.2 — Actuarial (gains) losses (4.2) 0.1 (4.1) 2.2 Benefits paid (21.3) (22.4) (4.1) (4.9) Benefit obligation at end of year 217.2 228.3 45.9 51.3 Changes in plan assets: Fair value of plan assets at beginning of year 231.1 231.7 — — Actual return on plan assets 3.5 21.2 — — Employer contributions 1.1 0.5 4.1 4.9 Benefits paid (21.3) (22.4) (4.1) (4.9) Fair value of plan assets at end of year 214.4 231.1 — — Funded status at end of year $ (2.8) $ 2.8 $ (45.9) $ (51.2) Amounts recognized in Consolidated Balance Sheets: Non-current assets $ 8.7 $ 11.1 $ — $ — Current liabilities (0.5) (0.5) (4.4) (4.6) Non-current liabilities (11.0) (7.9) (41.5) (46.6) Net amount recognized $ (2.8) $ 2.8 $ (45.9) $ (51.2) Amounts recognized in accumulated other comprehensive loss (pre-tax): Net actuarial loss (gain) $ 64.2 $ 56.4 $ (11.6) $ (8.9) The benefit obligation for our pension benefits is the projected benefit obligation based upon credited service as of the measurement date. The pension funded status at December 31, 2024 was unfavorably affected by an increase of plan liabilities, partially offset by an increase in the discount rate and plan asset returns. The OPEB benefit obligation decreased as of December 31, 2024 due to an increase in the discount rate, increase in claim costs assumptions, and the continued payment of benefits, partially offset by demographic changes. Information as of December 31 for certain pension plans included above with accumulated benefit obligations in excess of plan assets were as follows: 2024 2023 Projected benefit obligation $ 123.1 $ 129.1 Accumulated benefit obligation 123.1 129.1 Fair value of plan assets 111.6 120.7 Net Periodic Cost Service cost is the actuarial present value of benefits attributed by the plans’ benefit formula to services rendered by employees during the year. Interest cost represents the increase in the projected benefit obligation, which is a discounted amount, due to the passage of time. The expected return on plan assets reflects the computed amount of current-year earnings from the investment of plan assets using an estimated long-term rate of return. Pension Benefit Plans Other Postretirement 2024 2023 2022 2024 2023 2022 Service cost $ 2.5 $ 3.5 $ 2.2 $ 0.2 $ 0.2 $ 0.3 Interest cost 11.9 12.5 8.9 2.5 2.8 2.1 Expected return on plan assets (15.7) (15.2) (11.3) — — — Amortization of actuarial loss (gain) 0.1 0.1 6.2 (0.5) (0.4) — Net periodic cost (income) before curtailments (1.2) 0.8 5.9 2.2 2.6 2.4 Curtailments — — — (1.9) — — Net periodic cost (income) $ (1.2) $ 0.8 $ 5.9 $ 0.3 $ 2.6 $ 2.4 The components of net periodic pension expense other than the Service cost component are included in "Other non-operating expense" in the Consolidated Statements of Operations. During 2024, 2023, and 2022, $2.2 million, $3.1 million and $2.2 million of net periodic pension and OPEB costs were charged to "Cost of sales" and $0.6 million, $0.6 million and $0.4 million were charged to "Selling, general and administrative expenses," in the accompanying Consolidated Statements of Operations. Assumptions: Pension Benefit Plans Other Postretirement 2024 2023 2022 2024 2023 2022 Actuarial assumption used to determine benefit obligation: Discount rate 5.7 % 5.5 % 5.6 % 5.7 % 5.3 % 5.6 % Actuarial assumption used to determine net periodic pension costs: Discount rate 5.5 % 5.6 % 3.0 % 5.3 % 5.6 % 2.9 % Expected return on plan assets 6.1 % 5.8 % 4.0 % — % — % — % The discount rate used in the determination of pension benefit and OPEB obligations and pension expense was determined based on a review of long-term, high-grade bonds. The expected return on plan assets assumption is based upon an analysis of historical long-term returns for various investment categories, as measured by appropriate indices and forward-looking expectations of returns. These indices are weighted based upon the extent to which plan assets are invested in the particular categories in arriving at our determination of a composite expected return. The assumed health care cost trend rate used to calculate 2024 OPEB cost was 7.1% in 2024, grading to 3.7% by 2074, for participants whose benefits are not provided through HRAs, and 4.5% in 2024 through 2031, then grading to 3.7% after 2031 for participants whose benefits are provided through HRAs. The health care cost trend rate used to calculate December 31, 2024 OPEB obligations was 6.3% in 2024, grading to 3.7% by 2074, for participants whose benefits are not provided through HRAs, and 4.50% in 2024, grading to 3.7% after 2031, for participants whose benefits are provided through HRAs. The assumed health care cost trend rate used to calculate 2023 OPEB cost was 6.5% in 2023, grading to 3.7% by 2074, for participants whose benefits are not provided through HRAs, and 4.5% in 2023 through 2030, then grading to 3.7% after 2030 for participants whose benefits are provided through HRAs. The health care cost trend rate used to calculate December 31, 2023 OPEB obligations was 6.9% in 2024, grading to 3.7% by 2074, for participants whose benefits are not provided through HRAs, and 4.5% in 2024, grading to 3.7% after 2030, for participants whose benefits are provided through HRAs. Plan Assets There have been no changes in the methodologies used during 2024 and 2023. Investments in common and collective trust funds are generally valued based on their respective net asset value (or its equivalent), as a practical expedient to estimate fair value due to the absence of a readily determinable fair value. The following tables set forth by level, within the fair value hierarchy, the investments at fair value for our company-sponsored pension benefit plans: December 31, 2024 Level 1 Investments measured at net asset value Total Cash and cash equivalents $ 1.7 $ — $ 1.7 Collective investment funds — 212.7 212.7 Total investments at fair value $ 1.7 $ 212.7 $ 214.4 December 31, 2023 Level 1 Investments measured at net asset value Total Cash and cash equivalents $ 1.9 $ — $ 1.9 Collective investment funds — 229.2 229.2 Total investments at fair value $ 1.9 $ 229.2 $ 231.1 We have formal investment policy guidelines for our company-sponsored plans. These guidelines were set by our Benefits Committee, which is comprised of members of our management and has been assigned its fiduciary authority over management of the plan assets by our Board of Directors. The Committee’s duties include periodically reviewing and modifying those investment policy guidelines as necessary and ensuring that the policy is adhered to and the investment objectives are met. The investment policy includes guidelines for specific categories of equity and fixed income securities. Assets are managed by professional investment managers who are expected to achieve a reasonable rate of return over a market cycle. Long-term performance is a fundamental tenet of the policy. The general policy states that plan assets would be invested to seek the greatest return consistent with the fiduciary character of the pension funds and to allow the plans to meet the need for timely pension benefit payments. The specific investment guidelines stipulate that management is to maintain adequate liquidity for meeting expected benefit payments by reviewing, on a timely basis, contribution and benefit payment levels and appropriately revising long-term and short-term asset allocations. Management takes reasonable and prudent steps to preserve the value of pension fund assets, avoid the risk of large losses and also attempt to preserve the funded status of the plans. Major steps taken to provide this protection included: ▪ Assets are diversified among various asset classes, such as domestic equities, international equities, fixed income and cash. The long-term asset allocation ranges are as follows: Domestic equities 5% - 10% International equities, including emerging markets 5% - 10% Corporate/Government bonds 80% - 90% Liquid reserves —% - 5% Periodically, we review the allocations within these ranges to determine what adjustments should be made based on changing economic and market conditions and specific liquidity requirements. • Assets are managed by professional investment managers and could be invested in separately managed accounts or commingled funds. ▪ Assets are not invested in securities rated below BBB- by S&P or Baa3 by Moody’s. The investment guidelines also require that the individual investment managers be expected to achieve a reasonable rate of return over a market cycle. Emphasis is placed on long-term performance versus short-term market aberrations. Factors considered in determining reasonable rates of return include performance achieved by a diverse cross section of other investment managers, performance of commonly used benchmarks (e.g., Russell 3000 Index, MSCI World ex-U.S. Index, Barclays Capital Long Credit Index), actuarial assumptions for return on plan investments and specific performance guidelines given to individual investment managers. As of December 31, 2024, eight investment options held substantially all of the pension funds. Plan assets were diversified among the various asset classes within the allocation ranges approved by the Benefits Committee. In 2024, we contributed $0.7 million to our qualified pension plans, we currently do not anticipate making any cash contributions to those pans in 2025. We do not anticipate funding our OPEB plans in 2025 except to pay benefit costs as incurred during the year by plan participants. Estimated future benefit payments are as follows for the years indicated: Pension Other 2025 $ 19.9 $ 4.4 2026 19.6 4.2 2027 19.4 4.1 2028 19.0 4.0 2029 18.6 3.9 2030-2034 86.7 17.6 Multiemployer Defined Benefit Pension Plans Hourly employees at one of our manufacturing facilities participate in multiemployer defined benefit pension plans: the PACE Industry Union-Management Pension Fund (PIUMPF) which is managed by United Steelworkers (USW), Benefits; and the International Association of Machinist & Aerospace Workers National Pension Fund (IAM NPF). We make contributions to these plans, as well as make contributions to a trust fund established to provide retiree medical benefits for a portion of these employees, which is also managed by USW Benefits. The risks of participating in these multiemployer plans are different from single-employer plans in the following respects: • Assets contributed to the multiemployer plan by one employer may be used to provide benefits to employees of other participating employers. • If a participating employer stops contributing to the plan, the unfunded obligations of the plan may be borne by the remaining participating employers. The number of employers participating in PIUMPF fell from 135 during 2012 to 42 during 2023. We are the largest contributing employer participating in PIUMPF in 2024. • Under applicable federal law, any employer contributing to a multiemployer pension plan that completely ceases participating in the plan while it is underfunded is subject to an assessment of such employer's allocable share of the aggregate unfunded vested benefits of the plan, except when that plan is in "critical" or "critical and declining" status. In certain circumstances, an employer can also be assessed a statutory withdrawal liability for a partial withdrawal from a multiemployer pension plan. Based on information available to us as of December 31, 2024, as well as information provided by PIUMPF and IAM NPF and reviewed by our actuarial consultant, we estimate the aggregate pre-tax liability that we would have incurred if we had completely withdrawn from PIUMPF and IAM NPF in 2024 would have been in excess of $75 million. However, the exact amount of potential exposure could be higher or lower than the estimate, depending on, among other things, the nature and timing of any triggering events and the funded status of PIUMPF and IAM NPF at that time. A withdrawal liability is recorded for accounting purposes when withdrawal is probable and the amount of the withdrawal obligation is reasonably estimable. Our participation in these plans for the annual period ended December 31, 2024, is outlined in the table below. The “EIN" and "Plan Number” columns provide the Employee Identification Number, or EIN, and the three-digit plan number. The most recent Pension Protection Act, or PPA, zone status available in 2024 and 2023 is for a plan’s year-end as of December 31, 2024 and 2023. The zone status is set under the provisions of the Multiemployer Pension Plan Reform Act of 2014 and is based on information we received from the plans and is certified by each plan's actuary. Among other factors, plans in the red zone are generally less than 65 percent funded, plans in the yellow zone are less than 80 percent but more than 65 percent funded, and plans in the green zone are at least 80 percent funded. The “FIP/RP Status Pending/Implemented” column indicates plans for which a Funding Improvement Plan, or FIP, or a Rehabilitation Plan, or RP, is either pending or has been implemented as required by the PPA as a measure to correct its underfunded status. The last column lists the expiration date(s) of the collective-bargaining agreement(s) to which the plans are subject. In 2024, the contribution rate for the IAM NPF plan was $4.00 per hour. In accordance with that plan's Rehabilitation Plan, we began making an additional contribution in June 2019. This additional contribution started at 2.5% and will increase 2.5% each year while the Rehabilitation Plan is in effect. Starting November 2024 our additional contribution increased to 18.0% of our contractual contribution rate. This additional contribution is scheduled to continue and compound each year while the rehabilitation plan remains in effect. In 2024, the contribution rate for PIUMPF was $2.79 per hour. Contribution rates for IAM NPF and PIUMPF were increased as part of their respective RPs in lieu of the legally required surcharge, paid by the employers, to assist the fund’s financial status. We were listed in PIUMPF’s Form 5500 report as providing more than five percent of the total contributions for the years 2023 and 2022. At the date of issuance of our consolidated financial statements, Form 5500 reports for these plans were not available for the 2024 plan year. Pension EIN Plan PPA Zone Status FIP/RP Status Pending/ Contributions Surcharge Expiration Date of Collective Bargaining Agreement 2024 2023 2024 2023 2022 IAM NPF 51-6031295 002 Red Red Implemented $ 0.2 $ 0.2 $ 0.3 No 5/31/2026 PIUMPF 11-6166763 001 Red Red Implemented 5.7 5.6 5.5 No 8/31/2025 Total Contributions: $ 5.8 $ 5.8 $ 5.7 Other Benefit Plans We maintain the Clearwater Paper Corporation Management Deferred Compensation Plan. Pursuant to this plan, certain management employees are eligible to defer up to 50% of their regular salary and up to 10% of their annual incentives. Each plan participant is fully vested in these contributions. The liability under this plan totaled $6.0 million and $5.7 million at December 31, 2024 and 2023. The current and long-term portions of the liability are included in “Accounts payable and accrued liabilities” and “Deferred tax liabilities and other long-term obligations” on our Consolidated Balance Sheets.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	12 Months Ended
	Dec. 31, 2024
Equity [Abstract]
Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Income (Loss) Accumulated other comprehensive loss at the balance sheet dates is comprised of the following: Pension Plan Adjustments Other Postretirement Employee Benefit Plan Adjustments Total Balance at December 31, 2022 $ (46.5) $ 13.3 $ (33.3) Other comprehensive income (loss) before reclassifications 4.5 (1.7) 2.8 Amounts reclassified from accumulated other comprehensive loss 0.1 (0.3) (0.2) Other comprehensive income (loss), net of tax 4.6 (2.0) 2.6 Balance at December 31, 2023 (42.0) 11.3 (30.7) Other comprehensive income (loss) before reclassifications (6.0) 2.4 (3.6) Amounts reclassified from accumulated other comprehensive loss 0.1 (0.4) (0.3) Other comprehensive income (loss), net of tax (5.9) 2.1 (3.8) Balance at December 31, 2024 $ (47.8) $ 13.4 $ (34.5)

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2024
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share Basic earnings per share are based on the weighted average number of shares of common stock outstanding. Diluted earnings per share are 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 that 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. The following table reconciles the number of common shares used in calculating the basic and diluted net earnings per share: December 31, (In thousands - except per share data) 2024 2023 2022 Basic average common shares outstanding 16,781 16,863 16,985 Incremental shares due to: Stock-based awards — 148 196 Performance Shares — 80 — Diluted average common shares outstanding 16,781 17,091 17,181 Anti-dilutive shares excluded from the calculation were 0.3 million, for each of the years ended December 31, 2024, 2023 and 2022.

Stockholders' Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2024
Share-Based Payment Arrangement [Abstract]
Stockholders' Equity	Stockholders' Equity PREFERRED STOCK We are authorized to issue up to 5,000,000 shares of preferred stock at $0.0001 par value. At December 31, 2024, no shares of preferred stock have been issued. COMMON STOCK PLANS We have stock-based compensation plans under which stock options and restricted units are granted. At December 31, 2024, approximately 0.6 million shares were available for future issuance under our stock incentive plan. For The Years Ended December 31, 2024 2023 2022 Total stock-based compensation expense $ 5.6 $ 9.9 $ 12.7 Income tax benefit related to stock-based compensation 0.9 1.3 3.3 Impact on cash flow due to taxes paid related to net share settlement of equity awards 4.1 4.7 2.5 Intrinsic value of options exercised, equity-based liabilities paid, and the fair value of restricted stock units vested 12.9 14.7 9.5 We recognize the compensation costs on a straight-line basis over the requisite service period of the award, which is generally the vesting term of three years. Forfeitures are recognized as they occur. During 2024, 2023, and 2022, $0.3 million of stock-based compensation expense was charged to "Cost of sales," $4.9 million, $8.0 million and $9.5 million was charged to "Selling, general and administrative expenses," $0.9 million, $0.7 million and $1.9 million charged to Discontinued Operations, and $0.4 million of income, $0.9 million of expense, and $0.9 million of expense was charged to "Other operating charges, net" in the accompanying Consolidated Statements of Operations. Restricted Stock Units (Time and Performance Vesting) We grant restricted awards to certain employees. The awards can either be time vested or vested based upon the attainment of certain performance metrics over a certain time period. Performance conditions generally are tied to attainment of certain financial targets such as return on invested capital, free cash flow or other similar measures. Awards granted under our stock incentive plan generally have a performance or vesting period of three years from the grant date. These awards are eligible to receive dividend equivalent shares. The market value of these grants approximates the fair value. The performance-based restricted stock units were valued using a Monte Carlo simulation. For awards based upon the achievement of performance goals, the award could range from 0% to 200%. A summary of the status of outstanding restricted stock units as of December 31, 2024, and changes during the year, is presented below: Time Vested Performance-based Shares Weighted Shares Weighted Average Grant Date Fair Value Restricted stock units outstanding at December 31, 2023 402,407 $ 32.97 225,104 $ 36.54 Granted 221,319 38.18 163,310 40.17 Vested (206,810) 30.94 (107,558) 39.84 Forfeited (108,761) 36.73 — — Restricted stock units outstanding at December 31, 2024 308,155 $ 36.75 280,856 $ 37.33 The weighted average grant date fair value for restricted stock units (time-vested) granted during the years ended December 31, 2024, 2023 and 2022 was $38.18, $37.66 and $29.52. The weighted average grant date fair value for restricted stock units (performance-based) granted during the years ended December 31, 2024, 2023 and 2022 was $40.17, $40.47 and $30.55. As of December 31, 2024, there was $7.1 million of total unrecognized compensation cost related to outstanding restricted stock unit awards. Restricted stock unit cost is expected to be recognized over a weighted average period of 1.9 years for time vested awards and 0 years for performance-based awards. Stock Repurchases and Treasury Stock Our Board of Directors approved a new stock repurchase program on October 31, 2024 authorizing the repurchase of up to $100 million of our common stock. As of December 31, 2024, we had up to $96.7 million of authorization remaining. The repurchase program authorizes purchases of our common stock from time to time through open market purchases, negotiated transactions or other means, including accelerated stock repurchases and 10b-5-1 trading plans in accordance with applicable securities laws and other restrictions. We have no obligation to repurchase stock under this program and may suspend or terminate the program at any time. The authorization has no expiration date. Stock Options Prior to January 1, 2019, we granted options to certain employees. The options were granted at market price at the date of grant and the fair value of the options was estimated using the Black-Scholes option-pricing model (dividend yield ignored). As of December 31, 2024 all outstanding options are fully vested with a contractual term of ten years after the date of grant. A summary of the status of outstanding stock option awards as of December 31, 2024, and changes during the year, is presented below: Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Life (Years) Aggregate Intrinsic Value Outstanding options at December 31, 2023 285,682 $ 50.53 2.3 $ — Exercised (34,430) 38.24 — — Expired (62,638) 63.40 — — Outstanding and exercisable options at December 31, 2024 188,614 $ 48.49 1.7 $ — Director Awards Our Board of Directors are eligible to receive awards of phantom common stock units. Annually our outside directors receive phantom stock units as part of their compensation which vest ratably over a one-year period and accrue dividend equivalent shares for any dividends paid to shareholders of our common stock. The vested portion of a director’s phantom share balance is converted to cash using a twenty-day average price of common stock and paid to the director after their separation from service as a director. Due to its cash-settlement feature, we account for these awards as liabilities and recognize the equity-based compensation expense or income at the end of each reporting period based on the portion of the award that is vested and the increase or decrease in the value of our common stock. We recorded director equity-based compensation benefit for the year ended December 31, 2024 of $0.4 million. For the years ended December 31, 2023 and 2022, we recorded expense of $0.9 million. These amounts are included in “Other operating charges, net” in the Consolidated Statements of Operations. At December 31, 2024 and 2023, the liability amounts associated with director equity-based compensation included in "Deferred tax liabilities and other long-term obligations" and "Accounts payable and accrued liabilities" on our Consolidated Balance Sheets were $4.7 million, $0.8 million, $5.9 million and $0.2 million.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies SELF INSURANCE We are primarily self-insured for workers’ compensation and employee health care liability costs. Self-insurance liabilities for workers’ compensation are determined based upon a valuation performed by an actuarial firm. The estimate of future workers’ compensation liabilities incorporates loss development and an estimate associated with incurred but not yet reported claims. These claims are discounted. Self-insurance liabilities for employee health costs are determined actuarially based upon claims filed and estimated claims incurred but not yet reported. These claims are not discounted. PURCHASE OBLIGATIONS To help mitigate our exposure to market risk for changes in utility commodity pricing, we use firm price contracts to supply a portion of the natural gas and electricity requirements of our manufacturing facilities, which were reported through "Cost of sales" on our Consolidated Statements of Operations. As of December 31, 2024, these contracts cover approximately 44% of our expected average monthly natural gas and electricity needs at the respective manufacturing facilities through 2025. These contracts qualify for treatment as "normal purchases or normal sales" under authoritative guidance and require no mark-to-market adjustment. We enter into third-party contracts for certain raw materials, including pulp, logs and chemicals, which may extend beyond one year. Such contracts are typically negotiated to ensure availability of certain product specifications at market prices that adjust regularly within reasonable commercial terms. Such agreements may include minimum quantities, but reductions are permitted when economic or business conditions require reduced production containing the respective raw material.

Unusual or Infrequently Occurri

Unusual or Infrequently Occurring Items	12 Months Ended
	Dec. 31, 2024
Unusual or Infrequent Items, or Both [Abstract]
Unusual or Infrequent Items, or Both, Disclosure	Insurance Recovery During 2024, we experienced a natural gas disruption due to an extreme weather event that resulted in damage at our Lewiston, Idaho facility. We received $10.5 million in insurance proceeds, of which $4.7 million was related to business interruption insurance and $5.8 million was related to reimbursable costs. Proceeds of $9.3 million, associated with continuing operations, were recorded within "Cost of sales" in the Consolidated Statements of Operations and $0.3 million related to property, plant and equipment. Proceeds associated with discontinued operations were $0.9 million.

Segment Reporting

Segment Reporting	12 Months Ended
	Dec. 31, 2024
Segment Reporting [Abstract]
Segment Information	Segment Disclosure Our CEO The measure used by our CODM to assess performance and make operating decisions is net income (loss) as reported on our consolidated statements of operations. This, in connection with other metrics, is used by our CODM to identify underlying trends in the performance of our business and make comparisons with the financial performance of our competitors. Our CODM also reviews total assets, as reported on our consolidated balance sheets, and purchases of property and equipment, as reported on our consolidated statements of cash flows. Our CODM utilizes other key operating metrics, including disaggregated measures of net sales by product line, disaggregation of significant segment expenses and Adjusted EBITDA in order to assess our financial performance. Operating expenses are broken into categories for input costs (including raw materials and energy), supply chain costs (principally freight and outside warehouse costs) and labor and overhead related to our production facilities. Our manufacturing facilities and all other assets are located within the continental United States. The CODM does not review assets on a more disaggregated basis than what is presented on the Consolidated Balance Sheets. We sell and ship our products to customers in several foreign countries. Net sales based on continuing operations, classified by major product lines and the major geographic areas in which our customers are located are reflected in the following table: December 31, 2024 2023 2022 Net Sales by product line: Food Service $ 540.4 $ 404.8 $ 405.2 Folding carton 580.2 437.5 470.7 Sheeting and distribution 160.1 157.8 186.0 Pulp and other 102.9 135.9 133.1 Total Sales $ 1,383.6 $ 1,136.0 $ 1,195.0 Input cost (raw materials and energy) 615.0 494.5 515.7 Labor and overhead 482.2 302.7 298.7 Supply chain costs (principally freight) 140.1 105.3 119.5 Selling, general and administrative expenses 112.7 114.7 105.0 Depreciation and amortization 69.8 40.7 40.6 Interest expense, net 29.2 9.5 11.2 Non-significant expenses 35.7 2.9 22.3 Income tax provision (benefit) (27.1) 16.9 29.2 Income (loss) from continuing operations $ (74.0) $ 48.7 $ 52.7 Non-significant expenses is primarily made up of other operating charges, net, changes in inventory and debt retirement charges. Net sales, classified by major geographic area in which our customers are located, were as follows: December 31, 2024 2023 2022 Net Sales by geographical market: United States $ 1,252.5 $ 1,028.4 $ 1,097.7 Rest of World 131.2 107.6 97.3 $ 1,383.6 $ 1,136.0 $ 1,195.0 For the years ended December 31, 2024, 2023 and 2022, one customer was 10%, 13% and 10% of our total consolidated net sales.

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2024
Subsequent Events [Abstract]
Subsequent Events	Subsequent EventIn January of 2025, we implemented plans to reduce our cost structure across operations and selling, general and administrative expenses. We are targeting $30 million to $40 million in cost savings in 2025. In connection with these activities, we expect to record severance cost of $5.0 million to $7.0 million over the next 12 months.

Interim Reporting

Interim Reporting	12 Months Ended
	Dec. 31, 2024
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Information	Financial Results by Quarter (Unaudited) Three Months Ended March 31, June 30, September 30, December 31, (In millions - except per-share amounts) 2024 2023 2024 2023 2024 2023 2024 2023 Net Sales $ 258.8 $ 297.2 $ 344.4 $ 291.3 $ 393.3 $ 278.9 $ 387.1 $ 268.6 Gross profit 33.3 64.2 (2.0) 49.9 30.1 50.7 14.7 35.9 Income (loss) from continuing operations (2.1) 24.5 (41.6) 11.9 (10.7) 14.9 (19.6) (2.5) Net income (loss) 17.2 23.8 (25.8) 29.7 5.8 36.6 199.1 17.6 Net income (loss) per common share: Income (loss) from continuing operations $ (0.12) $ 1.46 $ (2.50) $ 0.71 $ (0.64) $ 0.89 $ (1.17) $ (0.15) Income (loss) from discontinued operations 1.16 (0.05) 0.95 1.05 1.00 1.31 13.08 1.21 Total basic earnings per share 1.03 1.41 (1.55) 1.76 0.35 2.20 11.91 1.06 Diluted net income (loss) per share: Income (loss) from continuing operations (0.12) 1.44 (2.50) 0.70 (0.64) 0.88 (1.17) (0.15) Income (loss) from discontinued operations 1.16 (0.04) 0.95 1.05 1.00 1.29 13.08 1.21 Total diluted earnings per share $ 1.03 $ 1.40 $ (1.55) $ 1.75 $ 0.35 $ 2.17 $ 11.91 $ 1.06 Shares used in per share computation Basic 16,607 16,834 16,661 16,865 16,620 16,682 16,724 16,638 Diluted 16,607 17,036 16,661 16,958 16,620 16,895 16,724 16,638 Adjusted EBITDA Reconciliation Net income (loss) $ 17.2 $ 23.8 $ (25.8) $ 29.7 $ 5.8 $ 36.6 $ 199.1 $ 17.6 Add (deduct): Income from discontinued operations, net of tax 19.3 (0.8) 15.7 17.8 16.6 21.8 218.8 20.2 Income (loss) from continuing operations (2.1) 24.5 (41.6) 11.9 (10.7) 14.9 (19.6) (2.5) Income tax provision (benefit) 0.5 8.7 (14.6) 4.3 (3.3) 3.7 (9.7) 0.2 Interest expense, net 1.2 2.8 9.6 2.9 13.1 2.2 5.3 1.6 Depreciation and amortization 9.0 10.0 17.0 10.2 22.4 10.1 21.5 10.3 Inventory revaluation on acquired business — — 6.8 — — — — — Debt extinguishment costs — — — — — — 9.1 3.1 Other operating charges, net 6.0 (0.4) 14.6 (0.1) (0.3) 1.6 3.7 2.1 Other non-operating income (0.3) (0.1) (0.3) (0.1) (0.3) (0.1) (0.7) 0.2 Adjusted EBITDA from continuing operations $ 14.2 $ 45.6 $ (8.5) $ 29.0 $ 20.9 $ 32.5 $ 9.5 $ 14.9

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pay vs Performance Disclosure
Net earnings	$ 199.1	$ 5.8	$ (25.8)	$ 17.2	$ 17.6	$ 36.6	$ 29.7	$ 23.8	$ 196.3	$ 107.7	$ 46

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Dec. 31, 2024 shares
Trading Arrangements, by Individual
Material Terms of Trading Arrangement	Rule 10b5-1 Trading Arrangements During the quarter ended December 31, 2024, the following director and officer (as defined in Rule 16a-1(f) of the Exchange Act) adopted a Rule 10b5-1 trading arrangement, as defined in Item 408 of Regulation S-K, for the sale of our common stock. Shares in the 10b5-1 trading arrangement that are subject to restricted stock units (“RSUs”) and stock options may only be traded following satisfaction of applicable vesting requirements. In addition, because of pricing (such as future share price targets) and timing conditions in the 10b5-1 trading arrangement, it is not yet determinable how many shares actually will be sold under the plan prior to its expiration date. On November 27, 2024, Kari Moyes, our Senior Vice President, HR, entered into a Rule 10b5-1 trading arrangement that provides for the sale of up to 37,076 shares of our common stock. This trading arrangement is scheduled to expire on March 31, 2026. This Rule 10b5-1 trading arrangement was entered into in writing during an open trading window and is intended to satisfy the affirmative defense of Rule 10b5-1(c) under the Exchange Act and our policies regarding transactions in our securities. During the quarter ended December 31, 2024, no other directors or officers adopted, modified, or terminated a “Rule 10b5-1 trading arrangement” or a “non-Rule 10b5-1 trading arrangement”, as defined in Item 408 of Regulation S-K.
Name	Kari Moyes
Title	Senior Vice President, HR
Rule 10b5-1 Arrangement Adopted	true
Non-Rule 10b5-1 Arrangement Adopted	false
Adoption Date	November 27, 2024
Rule 10b5-1 Arrangement Terminated	false
Expiration Date	March 31, 2026
Aggregate Available	37,076

Summary of Significant Accoun_2

Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2024
Accounting Policies [Abstract]
Nature of Operations	NATURE OF OPERATIONS AND BASIS OF PRESENTATION We are a premier manufacturer and supplier of bleached paperboard focused on servicing independent converters in North America. We also offer services that include customer sheeting, slitting, and cutting. Prior to the completion of the sale of our tissue business, we manufactured and sold consumer and parent roll tissues to major retailers, including grocery, club and discount stores. On May 1, 2024, we completed the acquisition of a paperboard manufacturing facility and associated business in Augusta, Georgia. See Note 3, "Business Acquisition," for more information about the acquisition. On November 1, 2024, we completed the sale of our tissue business. This represents a strategic shift in our operations and financial results requiring discontinued operations accounting treatment associated with this division. For all periods presented, the operating results associated with our tissue business have been reclassified to discontinued operations and have been shown as income (loss) from discontinued operations on our Consolidated Statements of Operations. The assets and liabilities associated with this business have been reflected as current and long-term assets and liabilities of discontinued operations in the Consolidated Balance Sheets. Additionally, certain reclassifications have been made to our continuing business to reflect certain intercompany transactions between our tissue business and our remaining entity such as treatment of intercompany sales and cost inputs. For the years ended December 31, 2023 and 2022, the impact of this reclassification was an increase to net sales of $76.7 million and $65.1 million and an increase to cost of sales of $77.5 million and $65.7 million. See Note 4, "Discontinued Operations," for more information on the divestiture.
Use of Estimates, Policy	USE OF ESTIMATES The preparation of financial statements in conformity with accounting principles generally accepted in the U.S. requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of net sales and expenses during the reporting period. Actual results may differ from those estimates.
Consolidation, Policy	PRINCIPLES OF CONSOLIDATION These consolidated financial statements include the financial condition and results of operations of Clearwater Paper Corporation and its wholly-owned subsidiaries. All intercompany transactions and balances between operations within the Company have been eliminated. Certain amounts have been reclassified from prior year presentation for consistency.
Business Combinations Policy	BUSINESS COMBINATIONS We apply the principles provided in the Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) 805, Business Combinations , to determine whether an acquisition involves an asset or a business. In determining whether an acquisition should be accounted for as a business combination or asset acquisition, we first determine whether substantially all of the fair value of the gross assets acquired is concentrated in a single identifiable asset or a group of similar identifiable assets. If this is the case, the single identifiable asset or the group of similar assets is accounted for as an asset acquisition. If this is not the case, we then further evaluate whether the single identifiable asset or group of similar identifiable assets and activities includes, at a minimum, an input and a substantive process that together significantly contribute to the ability to create outputs. If so, the transaction is accounted for as a business combination. We account for business combinations using the acquisition method of accounting which requires that (i) identifiable assets acquired (including identifiable intangible assets) and liabilities assumed generally be measured and recognized at fair value as of the acquisition date and (ii) the excess of the purchase price over the estimated net fair value of identifiable assets acquired and liabilities assumed be recognized as goodwill, which is not amortized for accounting purposes but is subject to testing for impairment at least annually. We measure and recognize asset acquisitions that are not deemed to be business combinations based on the cost to acquire the assets. Goodwill is not recognized in an asset acquisition with any consideration in excess of net assets acquired allocated to acquired assets on a relative estimated fair value basis. Transaction costs are expensed in a business combination and transaction costs directly attributable to the acquisition are considered a component of the cost of the acquisition in an asset acquisition. See Note 3, "Business Acquisition," for additional information.
Discontinued Operations, Policy [Policy Text Block]	DISCONTINUED OPERATIONS
Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy	CASH AND CASH EQUIVALENTS We consider all highly liquid instruments with maturities of three months or less to be cash equivalents.
Accounts Receivable [Policy Text Block]	ACCOUNTS RECEIVABLE Receivables consist of: December 31, 2024 2023 Trade accounts receivable $ 167.5 $ 85.2 Allowance for current expected credit losses (1.6) (1.2) Unbilled receivables 5.3 4.1 Taxes receivable 2.6 4.8 Other 15.0 3.1 $ 188.7 $ 96.1
Inventory, Policy [Policy Text Block]	INVENTORIES Our inventories are stated at the lower of net realizable value or current cost using the average cost method. December 31, 2024 2023 Logs, chips and sawdust $ 25.1 $ 22.1 Pulp 6.9 4.7 Paperboard products 123.4 77.4 Materials and supplies 102.5 57.0 $ 258.0 $ 161.2
Property, Plant and Equipment, Policy	PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment are stated at cost, including assets acquired under finance lease obligations, and any interest costs capitalized, less accumulated depreciation. Depreciation of buildings, equipment and other depreciable assets is determined using the straight-line method. Estimated useful lives generally range from 10 to 40 years for land improvements, 10 to 40 years for buildings and improvements and 2 to 25 years for machinery and equipment (includes office and other equipment). December 31, 2024 2023 Land and land improvements $ 65.8 $ 45.1 Buildings and improvements 232.4 179.4 Machinery and equipment 1,942.6 1,341.1 Construction in progress 87.6 43.0 Property, plant and equipment 2,328.4 1,608.6 Less accumulated depreciation and amortization (1,305.4) (1,247.9) Property, plant and equipment, net $ 1,023.1 $ 360.7 At December 31, 2024 and 2023, included within property, plant and equipment, net were finance leases of $8.6 million and $0.0 million and associated accumulated depreciation amounts of $0.3 million and $0.0 million. Depreciation expense is included in our financials as follows: For The Years Ended December 31, 2024 2023 2022 Continuing operations $ 67.7 $ 38.6 $ 38.5 Discontinued operations 30.0 57.9 62.6 Amortization of intangibles 2.1 2.1 2.1 $ 99.8 $ 98.6 $ 103.3 PLANNED MAINTENANCE We recognize the cost of repair and maintenance activities in the period in which the activity is performed or goods are consumed under the direct expense method. We perform planned maintenance activities at our facilities periodically and associated expenses are included in cost of sales.
Lessee, Leases [Policy Text Block]	LEASES Operating lease right-of-use (ROU) assets and liabilities are recognized at the commencement date of a lease based on the present value of lease payments over the lease term. Our leases may include options to extend or terminate the lease. These options to extend are included in the lease term when it is reasonably certain that we will exercise that option. Some leases have variable payments: however, because they are not based on an index or rate, they are not included in the ROU assets and lease liabilities. Variable payments for real estate leases primarily relate to common area maintenance, insurance, taxes and utilities. Variable payments for equipment, vehicles, and leases within supply agreements primarily relate to usage, repairs and maintenance. As the implicit rate is not readily determinable for most of our leases, we apply a portfolio approach using an estimated incremental borrowing rate to determine the initial present value of lease payments over the lease terms on a collateralized basis over a similar term, which is based on market and company specific information. We use our unsecured borrowing rate and risk-adjust that rate to approximate a collateralized rate. Leases having a lease term of twelve months or less are not recorded on the balance sheet and the related lease expense is recognized on a straight-line basis over the term of the lease. In addition, we have applied the practical expedient to account for the lease and non-lease components as a single lease component for all of our leases. See Note 6, "Leases" for further information.
Accounts Payable and Accrued Liabilities	ACCOUNTS PAYABLE AND ACCRUED LIABILITIES December 31, 2024 2023 Trade payables $ 164.6 $ 89.1 Accrued compensation 38.2 32.8 Operating lease liabilities 11.1 8.5 Taxes payable 50.8 1.2 Other 55.0 63.8 $ 319.7 $ 195.5 Included in accounts payable and other accrued liabilities is $25.8 million and $13.0 million related to capital expenditures that had not yet been paid as of December 31, 2024 and 2023. We maintain a program with a financial institution to provide our vendors with an option to receive payments earlier than our standard payment terms. Vendors receive payments directly from the financial institution . We are obligated to repay the financial institution in the next billing cycle which is generally 35 to 60 days later than payment to the supplier. Amounts under this program were included in "Other" in the table above and payments made under this program are reflected as cash outflows for operating activities in the Consolidated Statements of Cash Flows. The roll forward of our outstanding obligations confirmed as valid under the program were as follows: December 31, 2024 2023 Supplier finance program obligations balance, beginning of the year $ 14.7 $ 14.5 Invoice amounts added during the year 84.1 74.7 Invoice amounts paid during the year (86.1) (74.6) Supplier finance program obligations balance, end of year $ 12.7 $ 14.7
Pension and Other Postretirement Plans, Policy	RETIREMENT PLANS AND POSTRETIREMENT BENEFITS We are required to use actuarial methods and assumptions in the valuation of defined benefit obligations and other postretirement obligations and the determination of expense. Differences between actual and expected results or changes in the values of the obligations and plan assets are not recognized in earnings as they occur but, rather, systematically and gradually over subsequent periods. See Note 12, "Retirement Plans and Postretirement Benefits," for further information.
Income Tax, Policy	INCOME TAXES Income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the consolidated financial statement carrying amounts of existing assets and liabilities and their respective tax basis and operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. The determination of our provision for income taxes requires significant judgment, the use of estimates, and the interpretation and application of complex tax laws. Significant judgment is required in assessing the timing and amounts of deductible and taxable items and the probability of sustaining uncertain tax positions. The benefits of uncertain tax positions are recorded in our consolidated financial statements only after determining a more-likely-than-not probability that the uncertain tax positions will withstand challenge, if any, from tax authorities. When facts and circumstances change, we reassess these probabilities and record any changes in the consolidated financial statements as appropriate. See Note 8, "Income Taxes," for further information.
Revenue	REVENUE RECOGNITION We enter into contracts that can include various combinations of paperboard products, which are generally distinct and accounted for as separate performance obligations. Generally, revenue is recognized at a point in time upon transfer of control of promised products or services to customers in an amount that reflects the consideration we expect to receive in exchange for those products or services. Transfer of control typically occurs when the title and risk of loss passes to the customer. Shipping terms generally indicate when title and the risk of loss have passed, usually this is upon receipt at our customer's destination. We have elected to treat shipping and handling costs as a fulfillment cost. We expense incremental direct costs of obtaining a contract (sales commissions) when incurred because the amortization period is generally 12 months or less. We maintain consignment inventory at a limited number of customer locations. For consigned inventory, we recognize revenue upon transfer of control, which is often in advance of invoicing the customer. These amounts are classified as unbilled receivables in the above detail of accounts receivable. We provide for trade promotions, customer cash discounts and other deductions, which are considered variable consideration and recorded as a reduction to net sales. Returns and credits are estimated at contract inception and updated at the end of each reporting period as additional information becomes available. Revenue, net of returns and credits, is only recognized to the extent that it is probable that a significant reversal of any incremental revenue will not occur. Judgment associated with forecasted volumes is required to determine the most probable amount of variable consideration to apply as a reduction to net sales. Revenue is recognized net of any taxes collected from customers.
Other Operating Charges and Credits, Policy [Policy Text Block]	OTHER OPERATING CHARGES, NET We classify significant amounts unrelated to ongoing core operating activities as “Other operating charges, net” in the Consolidated Statements of Operations. Such items include, but are not limited to, amounts related to facility closures and related gain (loss) on sale and impairment, restructuring charges (including severance charges), charges to establish and maintain litigation or environmental reserves, gains or losses from settlements with governmental or other organizations, acquisition, integration and divestiture related costs and cash settled equity-based compensation to our directors. Due to the nature of these items, amounts in the statement of operations can fluctuate from year to year. The determination of which items are considered significant and unrelated to core operations is based upon management’s judgment. See Note 10, "Other Operating Charges, net" for a discussion of specific amounts in 2024, 2023 and 2022.
Financing Receivable [Policy Text Block]	ACCOUNTS RECEIVABLE ARRANGEMENT Prior to the sale of our tissue business, we maintained an uncommitted supply-chain financing program with a global financial institution. Under this program, a specific customer's trade accounts receivable may be acquired, without recourse, by the institution at a discounted rate.
Asset Retirement Obligation and Environmental Cost	ENVIRONMENTAL AND ASSET RETIREMENT OBLIGATIONS We estimate our environmental and asset retirement obligations based on various assumptions and judgments, the specific nature of which varies in light of the particular facts and circumstances surrounding each liability. These estimates typically reflect assumptions and judgments as to the probable nature, magnitude and timing of required investigation, remediation and monitoring activities and the probable cost of these activities. We have accrued only for specific costs related to environmental matters that we have determined are probable and for which an amount can be reasonably estimated. For asset retirement obligations, the liability is accreted to its settlement value and, where appropriate, the capitalized cost is depreciated over the useful life of the related asset. Upon settlement of the liability, we recognize a gain or loss for any difference between the settlement amount and the liability recorded. Our asset retirement obligation is included in "Deferred tax liabilities and other long-term obligations" in the Consolidated Balance Sheets. Our asset retirement obligation reflects the estimated present value of our obligations for capping, closure and post closure cost with respect to landfills, asbestos remediation and other ongoing environmental monitoring. The following table represents the activity associated with our asset retirement obligations. December 31, 2024 2023 Beginning balance $ 2.0 $ 1.9 Liabilities acquired 2.9 — Accretion expense 0.2 0.1 Payments (0.1) (0.1) Ending balance $ 5.0 $ 2.0
Treasury Stock	TREASURY STOCK Under our 2024 stock repurchase authorization, we repurchase shares of common stock and such shares are recorded at cost as treasury stock and result in a reduction of shareholders' equity in the Consolidated Balance Sheets. We use the weighted-average cost method for determining the cost of shares reissued. The difference between the cost of the treasury shares and the reissuance value is added to or deducted from additional paid-in capital. If additional paid in capital is exhausted, amounts will be deducted directly from retained earnings upon reissuance.

Accounting Policies (Tables)

Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2024
Accounting Policies [Abstract]
Schedule of Accounts, Notes, Loans and Financing Receivable	ACCOUNTS RECEIVABLE Receivables consist of: December 31, 2024 2023 Trade accounts receivable $ 167.5 $ 85.2 Allowance for current expected credit losses (1.6) (1.2) Unbilled receivables 5.3 4.1 Taxes receivable 2.6 4.8 Other 15.0 3.1 $ 188.7 $ 96.1
Schedule of Inventory, Current	INVENTORIES Our inventories are stated at the lower of net realizable value or current cost using the average cost method. December 31, 2024 2023 Logs, chips and sawdust $ 25.1 $ 22.1 Pulp 6.9 4.7 Paperboard products 123.4 77.4 Materials and supplies 102.5 57.0 $ 258.0 $ 161.2
Property, Plant and Equipment	PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment are stated at cost, including assets acquired under finance lease obligations, and any interest costs capitalized, less accumulated depreciation. Depreciation of buildings, equipment and other depreciable assets is determined using the straight-line method. Estimated useful lives generally range from 10 to 40 years for land improvements, 10 to 40 years for buildings and improvements and 2 to 25 years for machinery and equipment (includes office and other equipment). December 31, 2024 2023 Land and land improvements $ 65.8 $ 45.1 Buildings and improvements 232.4 179.4 Machinery and equipment 1,942.6 1,341.1 Construction in progress 87.6 43.0 Property, plant and equipment 2,328.4 1,608.6 Less accumulated depreciation and amortization (1,305.4) (1,247.9) Property, plant and equipment, net $ 1,023.1 $ 360.7
Accounts Payable and Accrued Liabilities	ACCOUNTS PAYABLE AND ACCRUED LIABILITIES December 31, 2024 2023 Trade payables $ 164.6 $ 89.1 Accrued compensation 38.2 32.8 Operating lease liabilities 11.1 8.5 Taxes payable 50.8 1.2 Other 55.0 63.8 $ 319.7 $ 195.5
Supplier Finance Program [Table Text Block]	The roll forward of our outstanding obligations confirmed as valid under the program were as follows: December 31, 2024 2023 Supplier finance program obligations balance, beginning of the year $ 14.7 $ 14.5 Invoice amounts added during the year 84.1 74.7 Invoice amounts paid during the year (86.1) (74.6) Supplier finance program obligations balance, end of year $ 12.7 $ 14.7
Schedule of Asset Retirement Obligations	The following table represents the activity associated with our asset retirement obligations. December 31, 2024 2023 Beginning balance $ 2.0 $ 1.9 Liabilities acquired 2.9 — Accretion expense 0.2 0.1 Payments (0.1) (0.1) Ending balance $ 5.0 $ 2.0

Business Combinations, Asset _2

Business Combinations, Asset Acquisitions, and Joint Venture Formation (Tables)	12 Months Ended
	Dec. 31, 2024
Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	Original Purchase Price Allocation Measurement Period Adjustments Updated Purchase Price Allocation Purchase price $ 708.2 $ — $ 708.2 Inventories, net 102.8 — 102.8 Other current assets 0.4 (0.1) 0.4 Property, plant and equipment 609.3 1.0 610.3 Other assets, net 11.8 — 11.8 Total assets acquired 724.3 0.9 725.2 Current portion of long-term debt (0.6) — (0.6) Accounts payable and accrued liabilities (7.7) (0.8) (8.5) Long-term debt (8.9) — (8.9) Other long-term obligations (12.6) — (12.6) Total liabilities assumed (29.7) (0.8) (30.5) Net assets acquired 694.5 0.1 694.7 Goodwill 13.7 (0.1) 13.6 Total estimated fair value of net assets acquired $ 708.2 $ — $ 708.2
Business Acquisition, Pro Forma Information	For The Years Ended December 31, (Unaudited) 2024 2023 Net sales $ 1,572.4 $ 1,750.8 Net income 183.0 124.1

Discontinued Operations and D_2

Discontinued Operations and Disposal Groups (Tables)	12 Months Ended
	Dec. 31, 2024
Discontinued Operations and Disposal Groups [Abstract]
Condensed Income Statement	Below is a reconciliation of line items constituting pre-tax income from discontinued operations to the after-tax income from discontinued operations as reported on our Consolidated Statement of Operations: For The Years Ended December 31, 2024 2023 2022 Net sales $ 870.3 $ 1,023.4 $ 950.2 Cost of sales 733.0 892.6 906.0 Selling, general and administrative expenses 26.2 29.4 23.0 Other operating charges, net 14.4 2.4 6.6 Income from discontinued operations 96.7 99.1 14.6 Non-operating expense (23.4) (20.5) (23.4) Income (loss) from discontinued operations before income taxes 73.3 78.6 (8.8) The major components of “Other operating charges, net” included in discontinued operations for the years ended December 31, 2024, 2023 and 2022 are reflected in the table below. These items are considered outside of our core discontinued operations. For The Years Ended December 31, 2024 2023 2022 Divestiture related costs $ 12.7 $ — $ — Costs associated with mill closure — — 0.3 Loss on sale or impairment associated with assets 0.4 2.4 4.7 Business improvement and other expenses 1.3 — 1.6 $ 14.4 $ 2.4 $ 6.6
Condensed Balance Sheet	The carrying amounts of major components of assets and liabilities included as part of discontinued operations are as follows: December 31, 2023 Assets of discontinued operations: Receivables, net of allowance for current expected credit losses $ 88.4 Inventories, net 158.6 Other current assets 0.5 Property, plant and equipment, net 629.4 Other assets, net 28.5 Total assets of discontinued operations 905.4 Liabilities of discontinued operations: Current portion of long-term debt 0.8 Accounts payable and accrued liabilities 89.6 Long-term debt 22.4 Liability for pension and other postretirement employee benefits 1.2 Deferred tax liabilities and other long-term obligations 114.5 Total liabilities of discontinued operations 228.6 Net assets of discontinued operations $ 676.8
Disposal Groups, Including Discontinued Operations	Operating and investing cash flows of the discontinued operation are presented in the following table: Twelve Months Ended December 31, 2024 2023 2022 Net cash provided by operating activities of discontinued operations $ 143.7 $ 121.3 $ 68.9 Net cash used in investing activities of discontinued operations (11.4) (18.8) (8.0)

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2024
Leases [Abstract]
Lease, Cost [Table Text Block]	COMPONENTS OF LEASE EXPENSE For The Years Ended December 31, 2024 2023 2022 Operating lease costs $ 12.9 $ 9.4 $ 8.3 Finance lease costs: Amortization of ROU assets 0.3 — — Interest on lease liabilities 0.5 — — Total finance lease costs 0.8 0.0 0.0 Variable lease costs 0.5 0.3 0.3 Total lease costs $ 14.2 $ 9.7 $ 8.6
Schedule of Amounts Recognized in Balance Sheet [Table Text Block]	SUPPLEMENTAL BALANCE SHEET INFORMATION December 31, Balance Sheet Caption 2024 2023 Lease ROU assets Operating lease assets Other assets, net $ 39.1 $ 31.7 Finance lease assets, net Property, plant and equipment, net $ 8.3 $ — Lease Liabilities Current operating lease liabilities Accounts payable and accrued liabilities $ 11.1 $ 8.5 Current finance lease liabilities Current portion of long-term debt $ 0.6 $ — Non-current operating lease liabilities Deferred tax liabilities and other long-term obligations $ 28.3 $ 24.2 Non-current finance lease liabilities Long-term debt $ 8.4 $ — Total operating lease liabilities $ 39.4 $ 32.7 Total finance lease liabilities $ 9.1 $ —
Lease term and discount rate [Table Text Block]	LEASE TERM AND DISCOUNT RATE December 31, 2024 2023 Weighted average remaining lease term (years) Operating leases 4.3 4.1 Finance leases 12.3 0.0 Weighted average discount rate Operating leases 6.5 % 6.1 % Finance leases 7.4 % — %
Lease, Supplemental cash flow information [Table Text Block]	SUPPLEMENTAL CASH FLOW INFORMATION The table below includes lease information for both continuing and discontinued operations. For The Years Ended December 31, 2024 2023 2022 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 20.7 $ 19.6 $ 19.7 Operating cash flows from finance leases 1.6 2.0 2.1 Financing cash flows from finance leases 1.1 0.9 1.1 Non-cash amounts for lease liabilities arising from obtaining ROU assets: Operating leases $ 3.5 $ 32.7 $ 6.4 Finance leases — — 4.2 Operating leases assumed on business acquisition 14.5 — — Finance leases assumed on business acquisition 8.6 — —
Lessee, Operating Lease, Liability, Maturity [Table Text Block]	MATURITY OF LEASE LIABILITIES As of December 31, 2024, our future maturities of lease liabilities were as follows: Operating Finance 2025 $ 13.2 $ 1.3 2026 11.6 1.3 2027 9.1 1.3 2028 4.5 1.2 2029 2.5 1.2 Thereafter 4.5 7.7 Total lease payments 45.4 13.9 Less imputed interest (6.0) (4.8) Present value of lease liabilities $ 39.4 $ 9.1
Below Market Lease, Future Amortization Income	As discussed in Note 4, "Discontinued Operations," we entered into a Lease Agreement associated with the sale of our tissue operations. This lease is included in "Accounts payable and accrued liabilities" and "Deferred tax liabilities and other long-term obligations" on our Consolidated Balance Sheets. The maturity analysis of lease income associated with the agreement as of December 31, 2024 is as follows: Total 2025 $ 4.8 2026 4.4 2027 4.0 2028 3.6 2029 3.3 Thereafter 12.1 Total $ 32.1

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Intangible Assets and Goodwill [Table Text Block]	Changes in the carrying amounts of goodwill and intangible assets were as follows: Goodwill Intangibles - Customer Relationship Total Balance as of December 31, 2022 $ 35.1 $ 8.6 $ 43.6 Amortization — (2.1) (2.1) Balance as of December 31, 2023 35.1 6.4 41.5 Recognized goodwill 1 13.6 — 13.6 Amortization — (2.1) (2.1) Balance as of December 31, 2024 $ 48.6 $ 4.3 $ 52.9
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	As of December 31, 2024, estimated future amortization expense related to intangible assets is as follows: Amount 2025 $ 2.1 2026 2.1 2027 — 2028 — 2029 — Total $ 4.3

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2024
Income Tax Disclosure [Abstract]
Provision (Benefit) for Income Taxes	The components of income tax provision (benefit) from continuing operations is comprised of the following: For The Years Ended December 31, 2024 2023 2022 Current Federal $ (73.9) $ 17.4 $ 19.8 State (1.1) 3.0 1.9 Total current (75.0) 20.5 21.7 Deferred Federal 50.9 (3.7) 3.2 State (3.0) 0.1 4.3 Total deferred 47.9 (3.6) 7.5 Income tax provision (benefit) $ (27.1) $ 16.9 $ 29.2
Income Tax Reconciliation	The income tax provision (benefit) from continuing operations differs from the amount computed by applying the statutory federal income tax rate to income (loss) before income taxes due to the following: For The Years Ended December 31, 2024 % 2023 % 2022 % Tax at the statutory rate $ (21.2) 21.0 % $ 13.8 21.0 % $ 17.2 21.0 % State and local taxes, net of federal income tax impact (4.5) 4.5 % 2.6 4.0 % 3.2 3.9 % Adjustment for state deferred tax rate 1 (0.1) 0.1 % (0.2) (0.2) % (4.7) (5.7) % Federal credits 2 (3.0) 3.0 % (1.0) (1.6) % 7.5 9.2 % Uncertain tax positions 0.1 (0.1) % 2.2 3.3 % (0.6) (0.7) % Non-deductible expenses 0.7 (0.7) % 1.3 1.9 % 1.6 1.9 % Change in valuation allowances 1 0.4 (0.4) % (0.7) (1.1) % 4.2 5.1 % Other, net 0.6 (0.6) % (1.0) (1.5) % 0.6 0.8 % Income tax provision (benefit) $ (27.1) 26.8 % $ 16.9 25.8 % $ 29.2 35.5 % 1 In 2022, Idaho revised their state income tax rate. Given our expected utilization, we recorded an offset to our valuation allowances for the amount of this reduction. 2 In 2022, we adjusted our tax positions under audit related to the disallowance of a previously taken federal tax credits based upon interpretation of the law.
Tax Effects of Significant Temporary Differences Creating Deferred Tax Assets and Liabilities	The tax effects of significant temporary differences creating deferred tax assets and liabilities at December 31 were: 2024 2023 Deferred tax assets: Employee benefits $ 2.2 $ 2.1 Postretirement employee benefits 11.4 13.0 Incentive compensation 2.6 3.7 Inventories 5.2 0.9 Pensions 0.9 — Federal and state credit carryforwards 9.6 8.6 Federal and state net operating losses 1.0 1.4 Operating leases 6.9 8.1 Capitalized research credits 10.7 4.4 Other 1.7 — Total deferred tax assets 52.1 42.2 Valuation allowance (8.0) (7.6) Deferred tax assets, net of valuation allowance 44.2 34.6 Deferred tax liabilities: Property, plant and equipment, net (124.6) (59.0) Operating leases (6.8) (7.9) Pensions — (0.5) Intangible assets, net — (1.3) Other (0.7) (1.2) Total deferred tax liabilities (132.1) (69.8) Net deferred tax liabilities $ (88.0) $ (35.2) Net deferred tax assets (liabilities) consist of: December 31, 2024 2023 Non-current deferred tax assets 1 $ 1.7 $ 0.8 Non-current deferred tax liabilities (89.7) (36.0) Net deferred tax liabilities $ (88.0) $ (35.2) 1 Included in "Other assets, net" on our accompanying December 31, 2024 and 2023 Consolidated Balance Sheets.
Schedule of Unrecognized Tax Benefits Roll Forward	For The Years Ended December 31, 2024 2023 2022 Beginning balance $ 80.9 $ 70.4 $ 5.9 Increases: Tax position taken in current year 0.9 0.4 68.6 Tax position taken in prior years — 10.4 (0.1) Decreases: Settlements during the year — (0.3) (3.1) Tax position taken in prior years (78.4) — — Lapse of statutes in current year (1.0) — (0.9) Ending balance $ 2.4 $ 80.9 $ 70.4

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2024
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments [Table Text Block]	Long-term debt at the balance sheet dates consisted of: December 31, 2024 December 31, 2023 Interest Rate at Principal Unamortized Debt Costs Total Principal Unamortized Debt Costs Total PCA Credit Agreement (term revolver) maturing 2029, fixed interest rate —% $ — $ — $ — $ 150.0 $ (2.8) $ 147.2 2020 Notes, maturing 2028, fixed interest rate 4.75% 275.0 (1.8) 273.2 275.0 (2.4) 272.6 ABL Credit Agreement (revolving loan), maturing 2027, variable interest rate —% — — — 20.0 — 20.0 Finance leases 9.1 — 9.1 — — — Total debt 284.1 (1.8) 282.2 445.0 (5.1) 439.9 Less: current portion (0.6) — (0.6) — — — Net long-term portion $ 283.4 $ (1.8) $ 281.6 $ 445.0 $ (5.1) $ 439.9
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments	The fair value of our debt as of December 31 is included in the following table: 2024 2023 2020 Notes, maturing 2028, fixed interest rate $ 258.9 $ 255.1 PCA Credit Agreement, maturing 2029, fixed interest rate — 150.6 Revolving credit facility, maturing 2027, variable interest rate — 20.0 $ 258.9 $ 425.7

Other Operating Charges, net (T

Other Operating Charges, net (Tables)	12 Months Ended
	Dec. 31, 2024
Other Income and Expenses [Abstract]
Schedule of Other Operating Cost and Expense, by Component [Table Text Block]	The major components of “Other operating charges, net” in the Consolidated Statements of Operations are: Years Ended December 31, 2024 2023 2022 Acquisition related costs $ 14.1 $ 1.9 $ — Integration costs 8.0 — — Loss on sale or impairment associated with assets 1.5 0.1 1.5 Directors' equity-based compensation expense (0.4) 0.9 0.9 Other 0.8 0.3 0.7 $ 24.0 $ 3.2 $ 3.2

Non Operating Income and Expe_2

Non Operating Income and Expenses (Tables)	12 Months Ended
	Dec. 31, 2024
Other Income and Expenses [Abstract]
Schedule of Other Nonoperating Income (Expense)	Non-Operating Expense The major components of “Non-operating expense” in the Consolidated Statements of Operations are: Years Ended December 31, 2024 2023 2022 Interest expense $ (32.0) $ (11.8) $ (11.7) Capitalized interest 1.6 0.3 0.1 Amortization of debt issuance costs and accretion of debt discount (1.7) (0.5) (0.6) Interest income 2.9 2.4 1.0 Interest expense, net (29.2) (9.5) (11.2) Debt retirement costs (9.1) (3.1) (0.5) Non-operating pension and other postretirement employee benefits income (expense) 1.8 0.1 (5.7) Total non-operating expense $ (36.6) $ (12.5) $ (17.4) During 2024, we repaid the outstanding term loans under the PCA Credit Agreement with proceeds from the sale of our tissue business. As a result of this repayment, we recognized a loss on debt extinguishment of $9.1 million, consisting of unamortized deferred debt costs. During 2023, we redeemed our 2014 Notes in full. This redemption resulted in a loss on early debt extinguishment of $3.1 million consisting of $0.4 million related to the write off of unamortized deferred debt costs along with the premium on debt redemption of $2.7 million.

Savings, Pension and Other Po_2

Savings, Pension and Other Postretirement Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2024
Changes in Benefit Obligation, Plan Assets and Funded Status for Company-Sponsored Benefit Plans	Pension Benefit Plans Other Postretirement 2024 2023 2024 2023 Change in projected benefit obligation: Benefit obligation at beginning of year $ 228.3 $ 234.7 $ 51.3 $ 50.9 Service cost 2.5 3.5 0.2 0.2 Interest cost 11.9 12.5 2.5 2.8 Plan changes — — 0.2 — Actuarial (gains) losses (4.2) 0.1 (4.1) 2.2 Benefits paid (21.3) (22.4) (4.1) (4.9) Benefit obligation at end of year 217.2 228.3 45.9 51.3 Changes in plan assets: Fair value of plan assets at beginning of year 231.1 231.7 — — Actual return on plan assets 3.5 21.2 — — Employer contributions 1.1 0.5 4.1 4.9 Benefits paid (21.3) (22.4) (4.1) (4.9) Fair value of plan assets at end of year 214.4 231.1 — — Funded status at end of year $ (2.8) $ 2.8 $ (45.9) $ (51.2) Amounts recognized in Consolidated Balance Sheets: Non-current assets $ 8.7 $ 11.1 $ — $ — Current liabilities (0.5) (0.5) (4.4) (4.6) Non-current liabilities (11.0) (7.9) (41.5) (46.6) Net amount recognized $ (2.8) $ 2.8 $ (45.9) $ (51.2) Amounts recognized in accumulated other comprehensive loss (pre-tax): Net actuarial loss (gain) $ 64.2 $ 56.4 $ (11.6) $ (8.9)
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Table Text Block]	Information as of December 31 for certain pension plans included above with accumulated benefit obligations in excess of plan assets were as follows: 2024 2023 Projected benefit obligation $ 123.1 $ 129.1 Accumulated benefit obligation 123.1 129.1 Fair value of plan assets 111.6 120.7
Pre-tax Components of Net Periodic Cost	Net Periodic Cost Service cost is the actuarial present value of benefits attributed by the plans’ benefit formula to services rendered by employees during the year. Interest cost represents the increase in the projected benefit obligation, which is a discounted amount, due to the passage of time. The expected return on plan assets reflects the computed amount of current-year earnings from the investment of plan assets using an estimated long-term rate of return. Pension Benefit Plans Other Postretirement 2024 2023 2022 2024 2023 2022 Service cost $ 2.5 $ 3.5 $ 2.2 $ 0.2 $ 0.2 $ 0.3 Interest cost 11.9 12.5 8.9 2.5 2.8 2.1 Expected return on plan assets (15.7) (15.2) (11.3) — — — Amortization of actuarial loss (gain) 0.1 0.1 6.2 (0.5) (0.4) — Net periodic cost (income) before curtailments (1.2) 0.8 5.9 2.2 2.6 2.4 Curtailments — — — (1.9) — — Net periodic cost (income) $ (1.2) $ 0.8 $ 5.9 $ 0.3 $ 2.6 $ 2.4
Weighted Average Assumptions Used to Determine Benefit Obligation	Assumptions: Pension Benefit Plans Other Postretirement 2024 2023 2022 2024 2023 2022 Actuarial assumption used to determine benefit obligation: Discount rate 5.7 % 5.5 % 5.6 % 5.7 % 5.3 % 5.6 % Actuarial assumption used to determine net periodic pension costs: Discount rate 5.5 % 5.6 % 3.0 % 5.3 % 5.6 % 2.9 % Expected return on plan assets 6.1 % 5.8 % 4.0 % — % — % — %
Investments at Fair Value for Company Sponsored Pension Benefit Plans within Fair Value Hierarchy	The following tables set forth by level, within the fair value hierarchy, the investments at fair value for our company-sponsored pension benefit plans: December 31, 2024 Level 1 Investments measured at net asset value Total Cash and cash equivalents $ 1.7 $ — $ 1.7 Collective investment funds — 212.7 212.7 Total investments at fair value $ 1.7 $ 212.7 $ 214.4 December 31, 2023 Level 1 Investments measured at net asset value Total Cash and cash equivalents $ 1.9 $ — $ 1.9 Collective investment funds — 229.2 229.2 Total investments at fair value $ 1.9 $ 229.2 $ 231.1
Schedule of Expected Benefit Payments	Estimated future benefit payments are as follows for the years indicated: Pension Other 2025 $ 19.9 $ 4.4 2026 19.6 4.2 2027 19.4 4.1 2028 19.0 4.0 2029 18.6 3.9 2030-2034 86.7 17.6
Multiemployer Defined Benefit Plans	Pension EIN Plan PPA Zone Status FIP/RP Status Pending/ Contributions Surcharge Expiration Date of Collective Bargaining Agreement 2024 2023 2024 2023 2022 IAM NPF 51-6031295 002 Red Red Implemented $ 0.2 $ 0.2 $ 0.3 No 5/31/2026 PIUMPF 11-6166763 001 Red Red Implemented 5.7 5.6 5.5 No 8/31/2025 Total Contributions: $ 5.8 $ 5.8 $ 5.7

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss (Tables)	12 Months Ended
	Dec. 31, 2024
Equity [Abstract]
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]	Accumulated other comprehensive loss at the balance sheet dates is comprised of the following: Pension Plan Adjustments Other Postretirement Employee Benefit Plan Adjustments Total Balance at December 31, 2022 $ (46.5) $ 13.3 $ (33.3) Other comprehensive income (loss) before reclassifications 4.5 (1.7) 2.8 Amounts reclassified from accumulated other comprehensive loss 0.1 (0.3) (0.2) Other comprehensive income (loss), net of tax 4.6 (2.0) 2.6 Balance at December 31, 2023 (42.0) 11.3 (30.7) Other comprehensive income (loss) before reclassifications (6.0) 2.4 (3.6) Amounts reclassified from accumulated other comprehensive loss 0.1 (0.4) (0.3) Other comprehensive income (loss), net of tax (5.9) 2.1 (3.8) Balance at December 31, 2024 $ (47.8) $ 13.4 $ (34.5)

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2024
Earnings Per Share [Abstract]
Reconciliation of Number of Common Shares Used in Calculating Basic and Diluted Net Earnings per Share	The following table reconciles the number of common shares used in calculating the basic and diluted net earnings per share: December 31, (In thousands - except per share data) 2024 2023 2022 Basic average common shares outstanding 16,781 16,863 16,985 Incremental shares due to: Stock-based awards — 148 196 Performance Shares — 80 — Diluted average common shares outstanding 16,781 17,091 17,181

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2024
Share-Based Payment Arrangement [Abstract]
Employee Equity-Based Compensation Expense	For The Years Ended December 31, 2024 2023 2022 Total stock-based compensation expense $ 5.6 $ 9.9 $ 12.7 Income tax benefit related to stock-based compensation 0.9 1.3 3.3 Impact on cash flow due to taxes paid related to net share settlement of equity awards 4.1 4.7 2.5 Intrinsic value of options exercised, equity-based liabilities paid, and the fair value of restricted stock units vested 12.9 14.7 9.5
Summary of Status of Outstanding RSU Awards	A summary of the status of outstanding restricted stock units as of December 31, 2024, and changes during the year, is presented below: Time Vested Performance-based Shares Weighted Shares Weighted Average Grant Date Fair Value Restricted stock units outstanding at December 31, 2023 402,407 $ 32.97 225,104 $ 36.54 Granted 221,319 38.18 163,310 40.17 Vested (206,810) 30.94 (107,558) 39.84 Forfeited (108,761) 36.73 — — Restricted stock units outstanding at December 31, 2024 308,155 $ 36.75 280,856 $ 37.33
Summary of Status of Outstanding Stock Option Awards and Changes During the Year	A summary of the status of outstanding stock option awards as of December 31, 2024, and changes during the year, is presented below: Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Life (Years) Aggregate Intrinsic Value Outstanding options at December 31, 2023 285,682 $ 50.53 2.3 $ — Exercised (34,430) 38.24 — — Expired (62,638) 63.40 — — Outstanding and exercisable options at December 31, 2024 188,614 $ 48.49 1.7 $ —

Segment Reporting (Tables)

Segment Reporting (Tables)	12 Months Ended
	Dec. 31, 2024
Segment Reporting [Abstract]
Reconciliation of Operating Profit (Loss) from Segments to Consolidated	December 31, 2024 2023 2022 Net Sales by product line: Food Service $ 540.4 $ 404.8 $ 405.2 Folding carton 580.2 437.5 470.7 Sheeting and distribution 160.1 157.8 186.0 Pulp and other 102.9 135.9 133.1 Total Sales $ 1,383.6 $ 1,136.0 $ 1,195.0 Input cost (raw materials and energy) 615.0 494.5 515.7 Labor and overhead 482.2 302.7 298.7 Supply chain costs (principally freight) 140.1 105.3 119.5 Selling, general and administrative expenses 112.7 114.7 105.0 Depreciation and amortization 69.8 40.7 40.6 Interest expense, net 29.2 9.5 11.2 Non-significant expenses 35.7 2.9 22.3 Income tax provision (benefit) (27.1) 16.9 29.2 Income (loss) from continuing operations $ (74.0) $ 48.7 $ 52.7
Revenue from External Customers by Geographic Areas [Table Text Block]	Net sales, classified by major geographic area in which our customers are located, were as follows: December 31, 2024 2023 2022 Net Sales by geographical market: United States $ 1,252.5 $ 1,028.4 $ 1,097.7 Rest of World 131.2 107.6 97.3 $ 1,383.6 $ 1,136.0 $ 1,195.0

Interim Reporting (Tables)

Interim Reporting (Tables)	12 Months Ended
	Dec. 31, 2024
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Information	Financial Results by Quarter (Unaudited) Three Months Ended March 31, June 30, September 30, December 31, (In millions - except per-share amounts) 2024 2023 2024 2023 2024 2023 2024 2023 Net Sales $ 258.8 $ 297.2 $ 344.4 $ 291.3 $ 393.3 $ 278.9 $ 387.1 $ 268.6 Gross profit 33.3 64.2 (2.0) 49.9 30.1 50.7 14.7 35.9 Income (loss) from continuing operations (2.1) 24.5 (41.6) 11.9 (10.7) 14.9 (19.6) (2.5) Net income (loss) 17.2 23.8 (25.8) 29.7 5.8 36.6 199.1 17.6 Net income (loss) per common share: Income (loss) from continuing operations $ (0.12) $ 1.46 $ (2.50) $ 0.71 $ (0.64) $ 0.89 $ (1.17) $ (0.15) Income (loss) from discontinued operations 1.16 (0.05) 0.95 1.05 1.00 1.31 13.08 1.21 Total basic earnings per share 1.03 1.41 (1.55) 1.76 0.35 2.20 11.91 1.06 Diluted net income (loss) per share: Income (loss) from continuing operations (0.12) 1.44 (2.50) 0.70 (0.64) 0.88 (1.17) (0.15) Income (loss) from discontinued operations 1.16 (0.04) 0.95 1.05 1.00 1.29 13.08 1.21 Total diluted earnings per share $ 1.03 $ 1.40 $ (1.55) $ 1.75 $ 0.35 $ 2.17 $ 11.91 $ 1.06 Shares used in per share computation Basic 16,607 16,834 16,661 16,865 16,620 16,682 16,724 16,638 Diluted 16,607 17,036 16,661 16,958 16,620 16,895 16,724 16,638 Adjusted EBITDA Reconciliation Net income (loss) $ 17.2 $ 23.8 $ (25.8) $ 29.7 $ 5.8 $ 36.6 $ 199.1 $ 17.6 Add (deduct): Income from discontinued operations, net of tax 19.3 (0.8) 15.7 17.8 16.6 21.8 218.8 20.2 Income (loss) from continuing operations (2.1) 24.5 (41.6) 11.9 (10.7) 14.9 (19.6) (2.5) Income tax provision (benefit) 0.5 8.7 (14.6) 4.3 (3.3) 3.7 (9.7) 0.2 Interest expense, net 1.2 2.8 9.6 2.9 13.1 2.2 5.3 1.6 Depreciation and amortization 9.0 10.0 17.0 10.2 22.4 10.1 21.5 10.3 Inventory revaluation on acquired business — — 6.8 — — — — — Debt extinguishment costs — — — — — — 9.1 3.1 Other operating charges, net 6.0 (0.4) 14.6 (0.1) (0.3) 1.6 3.7 2.1 Other non-operating income (0.3) (0.1) (0.3) (0.1) (0.3) (0.1) (0.7) 0.2 Adjusted EBITDA from continuing operations $ 14.2 $ 45.6 $ (8.5) $ 29.0 $ 20.9 $ 32.5 $ 9.5 $ 14.9

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Accounts Receivables) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Accounting Policies [Abstract]
Accounts Receivable, before Allowance for Credit Loss	$ 167.5	$ 85.2
Accounts Receivable, Allowance for Credit Loss, Current	(1.6)	(1.2)
Unbilled Receivables, Current	5.3	4.1
Income Taxes Receivable, Current	2.6	4.8
Other Receivables, Net, Current	15	3.1
Receivables, net of allowance for current expected credit losses of $1.6 and $1.2 at December 31, 2024 and 2023	$ 188.7	$ 96.1

Summary of Significant Accoun_4

Summary of Significant Accounting Policies (Inventories) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Accounting Policies [Abstract]
Inventory, Finished Goods, Gross	$ 123.4	$ 77.4
Other Inventory, Supplies, Gross	102.5	57
Inventories, net	258	161.2
Raw Materials
Accounting Policies [Abstract]
Inventory, Raw Materials, Gross	25.1	22.1
Inventory [Line Items]
Inventory, Raw Materials, Gross	25.1	22.1
Inventory Pulp [Member]
Accounting Policies [Abstract]
Inventory, Raw Materials, Gross	6.9	4.7
Inventory [Line Items]
Inventory, Raw Materials, Gross	$ 6.9	$ 4.7

Summary of Significant Accoun_5

Summary of Significant Accounting Policies (PP&E) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 2,328.4	$ 1,608.6
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(1,305.4)	(1,247.9)
Property, plant and equipment	1,023.1	360.7
Finance Lease, Right-of-Use Asset, before Accumulated Amortization	8.6	0
Depreciation and amortization	99.8	98.6	$ 103.3
Amortization of Intangible Assets		2.1
Discontinued Operations
Property, Plant and Equipment [Line Items]
Depreciation and amortization	30	57.9	62.6
Continuing Operations
Property, Plant and Equipment [Line Items]
Depreciation and amortization	67.7	38.6	38.5
Amortization of Intangible Assets	2.1	2.1	$ 2.1
Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	232.4	179.4
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	1,942.6	1,341.1
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	87.6	43
Land and Land Improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 65.8	$ 45.1
Minimum | Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Minimum | Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Minimum | Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	2 years
Maximum | Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	40 years
Maximum | Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	40 years
Maximum | Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	25 years

Summary of Significant Accoun_6

Summary of Significant Accounting Policies (Accounts Receivables Arrangement - Factoring) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Accounting Policies [Abstract]
Accounts Receivable, Sale	$ 261.6	$ 257.5
Gain (Loss) on Sale of Accounts Receivable	$ 3.4	$ 3.7	$ 1.8

Summary of Significant Accoun_7

Summary of Significant Accounting Policies (Environmental and ARO) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Accounting Policies [Abstract]
Asset Retirement Obligation	$ 5	$ 2	$ 1.9
Asset Retirement Obligation, Period Increase (Decrease)	2.9	0
Accretion Expense, Including Asset Retirement Obligations	0.2	0.1
Asset Retirement Obligation, Cash Paid to Settle	$ (0.1)	$ (0.1)

Summary of Significant Accoun_8

Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Accounting Policies [Abstract]
Accounts Receivable, before Allowance for Credit Loss	$ 167.5	$ 85.2
Accounts Receivable, Allowance for Credit Loss, Current	(1.6)	(1.2)
Unbilled Receivables, Current	5.3	4.1
Income Taxes Receivable, Current	2.6	4.8
Other Receivables, Net, Current	15	3.1
Receivables, net of allowance for current expected credit losses of $1.6 and $1.2 at December 31, 2024 and 2023	188.7	96.1
Inventory, Finished Goods, Gross	123.4	77.4
Other Inventory, Supplies, Gross	102.5	57
Depreciation and amortization	99.8	98.6	$ 103.3
Asset Retirement Obligation	5	2	$ 1.9
Accretion Expense, Including Asset Retirement Obligations	0.2	0.1
Asset Retirement Obligation, Cash Paid to Settle	$ (0.1)	$ (0.1)

Summary of Significant Accoun_9

Summary of Significant Accounting Policies (Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Capital Expenditures Incurred but Not yet Paid	$ 25.8	$ 13	$ 15.7
Accounts payable and accrued liabilities	319.7	195.5
Operating Lease, Liability, Current	11.1	8.5
Taxes Payable	50.8	1.2
SupplierFinanceProgramObligationStatementOfFinancialPositionExtensibleEnumerationNotDisclosedFlag	12.7	14.7	$ 14.5
Accounts Payable, Trade, Current	164.6	89.1
Employee-related Liabilities, Current	38.2	32.8
Operating Lease, Liability, Current	11.1	8.5
Other	55	63.8
Supplier Finance Program, Obligation, Addition	84.1	74.7
Supplier Finance Program, Obligation, Settlement	$ (86.1)	$ (74.6)

Summary of Significant Accou_10

Summary of Significant Accounting Policies (Nature of Operations) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Sales
Accounting Policies [Abstract]
Prior Period Reclassification Adjustment	$ 76.7	$ 65.1
Product Information [Line Items]
Prior Period Reclassification Adjustment	76.7	65.1
Cost of Sales [Member]
Accounting Policies [Abstract]
Prior Period Reclassification Adjustment	77.5	65.7
Product Information [Line Items]
Prior Period Reclassification Adjustment	$ 77.5	$ 65.7

Business Combinations, Asset _3

Business Combinations, Asset Acquisitions, and Joint Venture Formation (Details) - USD ($) $ in Millions		12 Months Ended
	May 01, 2024	Dec. 31, 2024	Dec. 31, 2023
Business Acquisition [Line Items]
BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAccountsPayable		$ (0.8)
BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentTotalLiabilitiesAssumed		(0.8)
BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentNetAssetsAcquired		0.1
Goodwill, Measurement Period Adjustment		(0.1)
Business Acquisition, Pro Forma Revenue		1,572.4	$ 1,750.8
Business Acquisition, Pro Forma Net Income (Loss)		183	$ 124.1
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment		1
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual		341.3
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual		(27)
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Assets		0.9
BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentOtherAssets		0.1
Augusta, Georgia Mill Acquisition
Business Acquisition [Line Items]
Business Combination, Consideration Transferred	$ 708.2	708.2
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory	102.8	102.8
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other	0.4	0.4
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	609.3	610.3
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	11.8	11.8
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	724.3	725.2
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-Term Debt	(0.6)	(0.6)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other	(7.7)	(8.5)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-Term Debt	(8.9)	(8.9)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other	(12.6)	(12.6)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	(29.7)	(30.5)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	694.5	694.7
Goodwill	13.7	13.6
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	$ 708.2	$ 708.2

Discontinued Operations and D_3

Discontinued Operations and Disposal Groups (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Nov. 01, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Consideration					$ 1,060
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax		$ 307.2	$ 0	$ 0
Working Capital Adjustment	$ 13.1
Disposal Group, Including Discontinued Operation, Revenue		870.3	1,023.4	950.2
Disposal Group, Including Discontinued Operation, Costs of Goods Sold		733	892.6	906
Disposal Group, Including Discontinued Operation, General and Administrative Expense		26.2	29.4	23
Disposal Group, Including Discontinued Operation, Other Expense		14.4	2.4	6.6
Disposal Group, Including Discontinued Operation, Operating Income (Loss)		96.7	99.1	14.6
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax		73.3	78.6	(8.8)
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net			88.4
Disposal Group, Including Discontinued Operation, Inventory			158.6
Disposal Group, Including Discontinued Operation, Other Assets, Current			0.5
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment			629.4
Disposal Group, Including Discontinued Operation, Other Assets			28.5
Disposal Group, Including Discontinued Operation, Assets			905.4
DisposalGroupIncludingDiscontinuedOperationShorttermDebt			0.8
Disposal Group, Including Discontinued Operation, Accounts Payable and Accrued Liabilities			89.6
DisposalGroupIncludingDiscontinuedOperationLongtermDebt			22.4
Disposal Group, Including Discontinued Operation, Postretirement Plan Benefit Obligation			1.2
Disposal Group, Including Discontinued Operation, Deferred Tax Liabilities			114.5
Disposal Group, Including Discontinued Operation, Liabilities			228.6
Cash Provided by (Used in) Operating Activities, Discontinued Operations		143.7	121.3	68.9
Cash Provided by (Used in) Investing Activities, Discontinued Operations		(11.4)	(18.8)	(8)
Asset Impairment Charges		1.5	0.1	1.5
Other Expenses		0.8	0.3	0.7
Other Receivables	$ 2.7	2.7
Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Other General Expense		0	0	0.3
Net Assets			676.8
Asset Impairment Charges		0.4	2.4	4.7
Other Expenses		1.3	0	1.6
Other Nonoperating Income (Expense)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Other Expense		23.4	20.5	23.4
Other Expense [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Other Expense		$ 12.7	$ 0	$ 0

Leases (Details)

Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Lessee, Lease, Description [Line Items]
Operating Lease, Cost	$ 12.9	$ 9.4	$ 8.3
Finance Lease, Right-of-Use Asset, Amortization	0.3	0	0
Finance Lease, Interest Expense	0.5	0	0
Variable Lease, Cost	0.5	0.3	0.3
Lease, Cost	14.2	9.7	8.6
Operating Lease, Payments	20.7	19.6	19.7
Finance Lease, Interest Payment on Liability	1.6	2	2.1
Finance Lease, Principal Payments	1.1	0.9	1.1
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	3.5	32.7	6.4
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	0	0	4.2
Operating leases assumed on business acquisition	14.5	0	0
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability, Business Acquisition	8.6	0	0
Operating Lease, Right-of-Use Asset	$ 39.1	31.7
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Property, plant and equipment
Finance Lease, Right-of-Use Asset	$ 8.3	0
Finance Lease, Right-of-Use Asset, before Accumulated Amortization	8.6	0
Finance Lease, Right-of-Use Asset, Accumulated Amortization	$ (0.3)	$ 0
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accounts payable and accrued liabilities	Accounts payable and accrued liabilities
Operating Lease, Liability, Current	$ 11.1	$ 8.5
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Current portion of long-term debt
Finance Lease, Liability, Current	$ 0.6	$ 0
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Deferred tax liabilities and other long-term obligations	Deferred tax liabilities and other long-term obligations
Operating Lease, Liability, Noncurrent	$ 28.3	$ 24.2
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Long-term debt
Finance Lease, Liability, Noncurrent	$ 8.4	0
Operating Lease, Liability	39.4	32.7
Finance Lease, Liability	$ 9.1	$ 0
Operating Lease, Weighted Average Remaining Lease Term	4 years 3 months 18 days	4 years 1 month 6 days
Finance Lease, Weighted Average Remaining Lease Term	12 years 3 months 18 days	0 years
Operating Lease, Weighted Average Discount Rate, Percent	6.50%	6.10%
Finance Lease, Weighted Average Discount Rate, Percent	7.40%	0%
Lessee, Operating Lease, Liability, to be Paid, Year One	$ 13.2
Finance Lease, Liability, Payments, Due Next Twelve Months	1.3
Lessee, Operating Lease, Liability, Payments, Due Year Two	11.6
Finance Lease, Liability, Payments, Due Year Two	1.3
Lessee, Operating Lease, Liability, Payments, Due Year Three	9.1
Finance Lease, Liability, Payments, Due Year Three	1.3
Lessee, Operating Lease, Liability, Payments, Due Year Four	4.5
Finance Lease, Liability, Payments, Due Year Four	1.2
Lessee, Operating Lease, Liability, Payments, Due Year Five	2.5
Finance Lease, Liability, Payments, Due Year Five	1.2
Lessee, Operating Lease, Liability, Payments, Due after Year Five	4.5
Finance Lease, Liability, Payments, Due after Year Five	7.7
Lessee, Operating Lease, Liability, Payments, Due	45.4
Finance Lease, Liability, Payment, Due	13.9
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(6)
Finance Lease, Liability, Undiscounted Excess Amount	$ (4.8)
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other assets, net	Other assets, net
Lessor, Operating Lease, Payment to be Received, Year One	$ 4.8
Lessor, Operating Lease, Payment to be Received, Year Two	4.4
Lessor, Operating Lease, Payment to be Received, Year Three	4
Lessor, Operating Lease, Payment to be Received, Year Four	3.6
Lessor, Operating Lease, Payment to be Received, Year Five	3.3
Lessor, Operating Lease, Payment to be Received, after Year Five	12.1
Lessor, Operating Lease, Payment to be Received	$ 32.1
Maximum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Remaining Lease Term	11 years
Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Remaining Lease Term	1 year
Finance lease costs [Member]
Lessee, Lease, Description [Line Items]
Lease, Cost	$ 0.8	$ 0	$ 0

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Estimated Future Amortization Expense Related to Intangible Assets (Details) $ in Millions	Dec. 31, 2024 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2025	$ 2.1
2026	2.1
2027	0
2028	0
2029	0
Net Balance	$ 4.3

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Details (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Goodwill [Line Items]
Intangible Assets, Net (Including Goodwill)	$ 52.9	$ 41.5	$ 43.6
Amortization of Intangible Assets		(2.1)
Finite-Lived Intangible Assets, Accumulated Amortization	30.6	28.4
Intangible Assets, Gross (Excluding Goodwill)	34.9	34.9
Continuing Operations
Goodwill [Line Items]
Goodwill	48.6	35.1	35.1
Intangible Assets, Net (Excluding Goodwill)	4.3	6.4	8.6
Goodwill, Acquired During Period	13.6
Amortization of Intangible Assets	$ (2.1)	$ (2.1)	$ (2.1)
Maximum [Member]
Goodwill [Line Items]
Finite-Lived Intangible Asset, Useful Life	10 years

Income Taxes - Provision (Benef

Income Taxes - Provision (Benefit) for Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Current
Federal									$ (73.9)	$ 17.4	$ 19.8
State									(1.1)	3	1.9
Current Income Tax Expense (Benefit)									(75)	20.5	21.7
Deferred
Federal									50.9	(3.7)	3.2
State									(3)	0.1	4.3
Deferred tax expense									47.9	(3.6)	7.5
Income tax provision	$ (9.7)	$ (3.3)	$ (14.6)	$ 0.5	$ 0.2	$ 3.7	$ 4.3	$ 8.7	(27.1)	16.9	29.2
Income Tax Examination [Line Items]
Federal									(73.9)	17.4	19.8
State									(1.1)	3	1.9
Current Income Tax Expense (Benefit)									(75)	20.5	21.7
Federal									50.9	(3.7)	3.2
State									(3)	0.1	4.3
Deferred taxes									47.9	(3.6)	7.5
Income tax provision	$ (9.7)	$ (3.3)	$ (14.6)	$ 0.5	$ 0.2	$ 3.7	$ 4.3	$ 8.7	(27.1)	$ 16.9	$ 29.2
Valuation allowances, State Tax Credits [Member]
Income Tax Examination [Line Items]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount									$ 2.6

Income Taxes - Income Tax Recon

Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent									21%	21%	21%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent									4.50%	4%	3.90%
Effective Income Tax Rate Reconciliation, Tax Contingency, State and Local, Percent									0.10%	(0.20%)	(5.70%)
Effective Income Tax Rate Reconciliation, Tax Credit, Percent									3%	(1.60%)	9.20%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent									(0.70%)	1.90%	1.90%
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent									(0.40%)	(1.10%)	5.10%
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent									(0.60%)	(1.50%)	0.80%
Effective Income Tax Rate Reconciliation, Percent									26.80%	25.80%	35.50%
Income tax provision	$ (9.7)	$ (3.3)	$ (14.6)	$ 0.5	$ 0.2	$ 3.7	$ 4.3	$ 8.7	$ (27.1)	$ 16.9	$ 29.2
Computed expected tax provision									(21.2)	13.8	17.2
State and local taxes, net of federal income tax impact									(4.5)	2.6	3.2
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount									0.7	1.3	1.6
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount									0.4	(0.7)	4.2
Other									$ 0.6	$ 1	$ 0.6
Effective Income Tax Rate Reconciliation, Percent									26.80%	25.80%	35.50%
Effective Income Tax Rate Reconciliation, Tax Contingency, State and Local, Amount									$ (0.1)	$ (0.2)	$ (4.7)
Effective Income Tax Rate Reconciliation, Tax Credit, Amount									$ 3	$ 1	$ 7.5
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent									(0.60%)	(1.50%)	0.80%
Income tax provision	$ (9.7)	$ (3.3)	$ (14.6)	$ 0.5	$ 0.2	$ 3.7	$ 4.3	$ 8.7	$ (27.1)	$ 16.9	$ 29.2
Uncertain tax provision
Effective Income Tax Rate Reconciliation, Deduction, Other, Amount									$ (0.1)	$ (2.2)	$ (0.6)
Uncertain tax provision
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, Worthless Stock Deduction									(0.10%)	3.30%	(0.70%)
Effective Income Tax Rate Reconciliation, Worthless Stock Deduction									(0.10%)	3.30%	(0.70%)

Income Taxes - Tax Effects of S

Income Taxes - Tax Effects of Significant Temporary Differences Creating Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Deferred Tax Assets, Gross [Abstract]
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits	$ 2.2	$ 2.1
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits	11.4	13
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation	2.6	3.7
Deferred Tax Assets, Inventory	5.2	0.9
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions	0.9	0
Deferred Tax Assets, Tax Credit Carryforwards	9.6	8.6
Deferred Tax Assets, Operating Loss Carryforwards	1	1.4
Deferred Tax Asset, In-Process Research and Development	10.7	4.4
Deferred tax assets, gross	52.1	42.2
Deferred Tax Assets, Valuation Allowance	8	7.6
Deferred Tax Assets, Net of Valuation Allowance	44.2	34.6
Tax position taken in current year	0.9	0.4	$ 68.6
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	0	(10.4)	(0.1)
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions	78.4	0	$ 0
Deferred tax liabilities:
Plant and equipment	(124.6)	(59)
Deferred Tax Liabilities, Leasing Arrangements	(6.8)	(7.9)
Deferred Tax Liabilities, Tax Deferred Expense, Compensation and Benefits Pension and Other Postretirement Benefits	0	(0.5)
Intangible assets	0	(1.3)
Deferred Tax Liabilities, Other	(0.7)	(1.2)
Deferred Tax Liabilities, Gross	132.1	69.8
Deferred Tax Liabilities, Net	88	35.2
Lease Agreements [Member]
Deferred Tax Assets, Gross [Abstract]
Deferred Tax Assets, Other	6.9	8.1
Other Expense [Member]
Deferred Tax Assets, Gross [Abstract]
Deferred Tax Assets, Other	$ 1.7	$ 0

- Net Deferred Tax Assets (Liab

- Net Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Millions		Dec. 31, 2024	Dec. 31, 2023
Disclosure Net Deferred Tax Assets Liabilities [Abstract]
Deferred Income Tax Assets, Net	[1]	$ 1.7	$ 0.8
Deferred tax liabilities and other long-term obligations		89.7	36
Deferred Tax Liabilities, Net		(88)	(35.2)
Deferred Tax Liabilities, Other		(0.7)	(1.2)
Deferred Tax Liabilities, Tax Deferred Expense, Compensation and Benefits Pension and Other Postretirement Benefits		$ 0	$ (0.5)
[1] Included in "Other assets, net" on our accompanying December 31, 2024 and 2023 Consolidated Balance Sheets.

Income Taxes - Tax Credits and

Income Taxes - Tax Credits and Losses Subject to Expiration by Major Jurisdictions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Tax Credit Carryforward [Line Items]
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	$ 0	$ 10.4	$ 0.1
Tax position taken in current year	0.9	0.4	68.6
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	0	0.3	3.1
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	$ 1	$ 0	$ 0.9

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Tax Credit Carryforward [Line Items]
Deferred Tax Assets, Valuation Allowance		$ 8	$ 7.6
Deferred Tax Assets, Tax Credit Carryforwards		9.6	8.6
Deferred Income Tax Assets, Net	[1]	1.7	0.8
Deferred tax liabilities and other long-term obligations		89.7	36
Deferred Tax Liabilities, Other		0.7	1.2
Deferred Tax Liabilities, Tax Deferred Expense, Compensation and Benefits Pension and Other Postretirement Benefits		0	(0.5)
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit			$ 10.4	$ 68.4
Valuation allowances, State Tax Credits [Member]
Tax Credit Carryforward [Line Items]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		$ 2.6
[1] Included in "Other assets, net" on our accompanying December 31, 2024 and 2023 Consolidated Balance Sheets.

Income Taxes - Roll Forward of

Income Taxes - Roll Forward of Unrecognized Tax Benefits and Associated Interest and Penalties Included in Balance Sheet (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Balance	$ 80.9	$ 70.4	$ 5.9
Tax position taken in current year	0.9	0.4	68.6
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	0	10.4	0.1
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	0	0.3	3.1
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	1	0	0.9
Balance	$ 2.4	$ 80.9	$ 70.4

Debt - Additional Information (

Debt - Additional Information (Details)			3 Months Ended								12 Months Ended
	Nov. 01, 2024 USD ($)	May 01, 2024 Rate	Dec. 31, 2024 USD ($) Rate	Sep. 30, 2024 USD ($)	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2024 USD ($) Rate	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Aug. 18, 2020 USD ($)
Debt Instrument [Line Items]
Long-term Debt, Gross			$ 284,100,000				$ 445,000,000				$ 284,100,000	$ 445,000,000
Unamortized Debt Issuance Expense			1,800,000				5,100,000				1,800,000	5,100,000
Finance Lease, Liability			9,100,000				0				9,100,000	0
Long-term debt			281,600,000				439,900,000				281,600,000	439,900,000
Long-Term Debt and Lease Obligation, Including Current Maturities			282,200,000				439,900,000				282,200,000	439,900,000
Borrowings on long-term debt											753,400,000	222,000,000	$ 0
Debt retirement costs			(9,100,000)	$ 0	$ 0	$ 0	(3,100,000)	$ 0	$ 0	$ 0	(9,100,000)	(3,100,000)	(500,000)
Write off of Deferred Debt Issuance Cost												400,000
Long-term Debt, Fair Value			258,900,000				425,700,000				258,900,000	425,700,000
Long-term Debt and Lease Obligation, Current			600,000				0				600,000	0
Long-term debt			283,400,000				445,000,000				283,400,000	445,000,000
Line of Credit Facility, Remaining Borrowing Capacity			221,300,000								221,300,000
Interest rate spread | Rate		3.65%
Credit facility, maximum borrowing capacity			$ 270,000,000								$ 270,000,000
Debt covenant, actual fixed charge ratio			0.020								0.020
Repayments of Debt											$ 931,100,000	325,600,000	$ 80,900,000
Line of Credit Facility, Initiation Date		May 01, 2024
J.P. Morgan [Member]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity			$ 375,000,000				275,000,000				375,000,000	275,000,000
Potential additional lines of credit			$ 100,000,000								$ 100,000,000
J.P. Morgan [Member] | Minimum
Debt Instrument [Line Items]
Ratio of Indebtedness to Net Capital			1.10								1.10
Interest rate spread											0.25%
J.P. Morgan [Member] | Maximum
Debt Instrument [Line Items]
Ratio of Indebtedness to Net Capital			1								1
Interest rate spread											0.375%
J.P. Morgan [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Minimum
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate | Rate			125%								125%
J.P. Morgan [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Maximum
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate | Rate			175%								175%
J.P. Morgan [Member] | Base Rate [Member] | Minimum
Debt Instrument [Line Items]
Interest rate spread | Rate											0.25%
AgWest Farm Credit
Debt Instrument [Line Items]
Potential additional lines of credit			$ 60,000,000								$ 60,000,000
Repayments of Debt	$ 490,000,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate | Rate			0%								0%
Long-term Line of Credit			$ 0				20,000,000				$ 0	20,000,000
Revolving Credit Facility [Member] | J.P. Morgan [Member]
Debt Instrument [Line Items]
Long-term Debt, Fair Value			0				20,000,000				0	20,000,000
Outstanding stand by letters of credit			3,700,000								3,700,000
Term Loan [Member] | AgWest Farm Credit
Debt Instrument [Line Items]
Long-term Debt, Gross			0				150,000,000				0	150,000,000
Unamortized Debt Issuance Expense			0				2,800,000				0	2,800,000
Long-term Debt			0				147,200,000				0	147,200,000
Long-term Debt, Fair Value			$ 0				150,600,000				$ 0	150,600,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate | Rate			0%								0%
Senior Note Due 2028 | Estimate of Fair Value Measurement [Member]
Debt Instrument [Line Items]
Long-term Debt, Fair Value			$ 258,900,000				255,100,000				$ 258,900,000	255,100,000
Senior Note Due 2028
Debt Instrument [Line Items]
Long-term Debt, Gross			275,000,000				275,000,000				275,000,000	275,000,000
Unamortized Debt Issuance Expense			1,800,000				2,400,000				1,800,000	2,400,000
Long-term Debt			$ 273,200,000				$ 272,600,000				$ 273,200,000	$ 272,600,000
Debt instrument, principal amount														$ 275,000,000
Debt instrument, interest rate														4.75%
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate | Rate			4.75%								4.75%
Long-term Debt
Debt Instrument [Line Items]
Long-term Debt, Gross			$ 275,000,000								$ 275,000,000
CLW_TwentyTwentNotesMember | Senior Notes
Debt Instrument [Line Items]
Debt instrument, maturity date											Aug. 15, 2028
Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Expiration Date											Nov. 07, 2027

Other Operating Charges, net (D

Other Operating Charges, net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Asset Impairment Charges	$ 1.5	$ 0.1	$ 1.5
Other Expenses	0.8	0.3	0.7
Other Cost and Expense, Operating	24	3.2	3.2
Business Combination, Acquisition Related Costs	14.1	1.9	0
Business Combination, Integration Related Costs	8	0	0
Director [Member]
Share-based Payment Arrangement, Expense	$ (0.4)	$ 0.9	$ 0.9

Non Operating Income and Expe_3

Non Operating Income and Expenses (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Other Income and Expenses [Abstract]
Interest Expense, Operating and Nonoperating									$ (32)	$ (11.8)	$ (11.7)
Interest Costs Capitalized Adjustment									1.6	0.3	0.1
Amortization of Debt Issuance Costs									(1.7)	(0.5)	(0.6)
Interest Income, Other									2.9	2.4	1
Interest expense, net	$ (5.3)	$ (13.1)	$ (9.6)	$ (1.2)	$ (1.6)	$ (2.2)	$ (2.9)	$ (2.8)	(29.2)	(9.5)	(11.2)
Debt retirement costs	$ (9.1)	$ 0	$ 0	$ 0	$ (3.1)	$ 0	$ 0	$ 0	$ (9.1)	$ (3.1)	$ (0.5)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]									Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)
Nonoperating Income (Expense)									$ (36.6)	$ (12.5)	$ (17.4)
Write off of Deferred Debt Issuance Cost										0.4
Redemption Premium										$ 2.7

Savings, Pension and Other Po_3

Savings, Pension and Other Postretirement Employee Benefit Plans - Changes in Benefit Obligation, Plan Assets and Funded Status for Company-Sponsored Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Liability for pension and other postretirement employee benefits	$ (52.5)	$ (54.5)
Pension Benefit Plans
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	228.3	234.7
Service cost	2.5	3.5	$ 2.2
Interest cost	11.9	12.5	8.9
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	0	0
Actuarial losses (gains)	(4.2)	0.1
Defined Benefit Plan, Benefit Obligation, Benefits Paid	(21.3)	(22.4)
Benefit obligation at end of year	217.2	228.3	234.7
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	231.1	231.7
Actual return on plan assets	3.5	21.2
Employer contribution	1.1	0.5
Defined Benefit Plan, Plan Assets, Benefits Paid	21.3	22.4
Fair value of plan assets at end of year	214.4	231.1	231.7
Funded status at end of year	(2.8)	2.8
Defined Benefit Plan, Funded (Unfunded) Status of Plan	2.8	(2.8)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Assets for Plan Benefits, Defined Benefit Plan	8.7	11.1
Current liability for pension and other postretirement employee benefits	(0.5)	(0.5)
Liability for pension and other postretirement employee benefits	(11)	(7.9)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position	(2.8)	2.8
Net actuarial loss (gain)	64.2	56.4
Other Postretirement Employee Benefit Plans
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	51.3	50.9
Service cost	0.2	0.2	0.3
Interest cost	2.5	2.8	2.1
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	0.2	0
Actuarial losses (gains)	(4.1)	2.2
Defined Benefit Plan, Benefit Obligation, Benefits Paid	(4.1)	(4.9)
Benefit obligation at end of year	45.9	51.3	50.9
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Employer contribution	4.1	4.9
Defined Benefit Plan, Plan Assets, Benefits Paid	4.1	4.9
Fair value of plan assets at end of year	0	0	$ 0
Funded status at end of year	(45.9)	(51.2)
Defined Benefit Plan, Funded (Unfunded) Status of Plan	45.9	51.2
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Assets for Plan Benefits, Defined Benefit Plan	0	0
Current liability for pension and other postretirement employee benefits	(4.4)	(4.6)
Liability for pension and other postretirement employee benefits	(41.5)	(46.6)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position	(45.9)	(51.2)
Net actuarial loss (gain)	$ (11.6)	$ (8.9)

- Certain Pension Plans with Ac

- Certain Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Abstract]
Projected benefit obligation	$ 123.1	$ 129.1
Accumulated benefit obligation	123.1	129.1
Fair value of plan assets	$ 111.6	$ 120.7

Savings, Pension and Other Po_4

Savings, Pension and Other Postretirement Employee Benefit Plans - Pre-tax Components of Net Periodic Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Net periodic cost	$ 0.3
Pension Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	2.5	$ 3.5	$ 2.2
Interest cost	11.9	12.5	8.9
Expected return on plan assets	(15.7)	(15.2)	(11.3)
Amortization of actuarial loss	0.1	0.1	6.2
Net periodic cost	(1.2)	0.8	5.9
Other Postretirement Employee Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.2	0.2	0.3
Interest cost	2.5	2.8	2.1
Expected return on plan assets	0	0	0
Amortization of actuarial loss	(0.5)	(0.4)	0
Net periodic cost	2.2	$ 2.6	$ 2.4
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment	$ (1.9)

Savings, Pension and Other Po_5

Savings, Pension and Other Postretirement Employee Benefit Plans - Weighted Average Assumptions Used to Determine Benefit Obligation (Details)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pension Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.70%	5.50%	5.60%
Discount rate	5.50%	5.60%	3%
Expected return on plan assets	6.10%	5.80%	4%
Other Postretirement Employee Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.70%	5.30%	5.60%
Discount rate	5.30%	5.60%	2.90%
Expected return on plan assets	0%	0%	0%

Savings, Pension and Other Po_6

Savings, Pension and Other Postretirement Employee Benefit Plans - Weighted Average Assumptions Used to Determine Net Periodic Cost (Benefit) (Details)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pension Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.50%	5.60%	3%
Expected return on plan assets	6.10%	5.80%	4%
Other Postretirement Employee Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.30%	5.60%	2.90%
Expected return on plan assets	0%	0%	0%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate	6.30%	6.90%
Other Postretirement Employee Benefit Plans | Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate	3.70%	3.70%
Other Postretirement Employee Benefit Plans | OPEB Obligation
Defined Benefit Plan Disclosure [Line Items]
defined benefit plan, ultimate health care cost trend rates, with added benefits	4.50%	4.50%
Other Postretirement Employee Benefit Plans | OPEB Obligation | Maximum
Defined Benefit Plan Disclosure [Line Items]
defined benefit plan, ultimate health care cost trend rates, with added benefits	3.70%	3.70%
Postemployment Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate	2074	2074

Savings, Pension and Other Po_7

Savings, Pension and Other Postretirement Employee Benefit Plans - Investments at Fair Value for Company Sponsored Pension Benefit Plans Within Fair Value Hierarchy (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 1.7	$ 1.9
Investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	214.4	231.1
Common Collective Trust
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	212.7	229.2
Fair Value, Inputs, Level 1 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1.7	1.9
Fair Value, Inputs, Level 1 | Investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1.7	1.9
Fair Value, Inputs, Level 1 | Common Collective Trust
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value Measured at Net Asset Value Per Share | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value Measured at Net Asset Value Per Share | Investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	212.7	229.2
Fair Value Measured at Net Asset Value Per Share | Common Collective Trust
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 212.7	$ 229.2

Savings, Pension and Other Po_8

Savings, Pension and Other Postretirement Employee Benefit Plans - Long Term Asset Allocation Ranges (Details)	Dec. 31, 2024 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Number of Investment Options Holding Substantially All Pension Funds	8
Minimum [Member] | Domestic equities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	5%
Minimum [Member] | International equities, including emerging markets
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	5%
Minimum [Member] | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	80%
Minimum [Member] | Liquid reserves
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	0%
Maximum | Domestic equities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	10%
Maximum | International equities, including emerging markets
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	10%
Maximum | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	90%
Maximum | Liquid reserves
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	5%

Savings, Pension and Other Po_9

Savings, Pension and Other Postretirement Employee Benefit Plans - Estimated Future Benefit Payments (Details) $ in Millions	Dec. 31, 2024 USD ($)
Pension Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
2025	$ 19.9
2026	19.6
2027	19.4
2028	19
2029	18.6
2030-2034	86.7
Other Postretirement Employee Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
2025	4.4
2026	4.2
2027	4.1
2028	4
2029	3.9
2030-2034	$ 17.6

Savings, Pension and Other P_10

Savings, Pension and Other Postretirement Employee Benefit Plans - Multiemployer Defined Benefit Plans (Details)	3 Months Ended	7 Months Ended	12 Months Ended
	Dec. 31, 2024 USD ($)	Dec. 31, 2019	Dec. 31, 2024 USD ($) $ / Hour	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Multiemployer Plan, Pension, Significant, Employer Contribution, Cost			$ 5,800,000	$ 5,800,000	$ 5,700,000
Multiemployer Plan, Contribution Rate Increase (Decrease)			2.50%
Defined Benefit Plan, Number of Investment Options Holding Substantially All Pension Funds	8		8
IAM
Defined Benefit Plan Disclosure [Line Items]
Multiemployer Plan, Pension, Significant, Surcharge [Fixed List]			No
Multiemployer Plan, Pension, Significant, Plan Number			002
Multiemployer Plan, Pension, Significant, Employer Contribution, Cost			$ 200,000	$ 200,000	300,000
Multiemployer Plan, Pension, Significant, Collective-Bargaining Arrangement, Expiration Date			May 31, 2026
Multiemployer Plan, Pension, Significant, Certified Zone Status [Fixed List]			Red	Red
USW
Defined Benefit Plan Disclosure [Line Items]
Multiemployer Plan, Pension, Significant, Surcharge [Fixed List]			No
Multiemployer Plan, Pension, Significant, Plan Number			001
Multiemployer Plan, Pension, Significant, Employer Contribution, Cost			$ 5,700,000	$ 5,600,000	$ 5,500,000
Multiemployer Plan, Pension, Significant, Collective-Bargaining Arrangement, Expiration Date			Aug. 31, 2025
Multiemployer Plan, Pension, Significant, Certified Zone Status [Fixed List]			Red	Red
International Association Of Machinist Contribution Rate
Retirement Benefits [Abstract]
Contribution rates | $ / Hour			4
United Steel Workers Contribution Rate
Retirement Benefits [Abstract]
Contribution rates | $ / Hour			2.79
International Association Of Machinist Contribution Rate Additional Contribution
Defined Benefit Plan Disclosure [Line Items]
Multiemployer Plan, Contribution Rate Increase (Decrease)	18%	2.50%

- Additional Information (Detai

- Additional Information (Details)	12 Months Ended
	Dec. 31, 2024 USD ($) facility	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Number of Investment Options Holding Substantially All Pension Funds	8
Employer contributions	$ 18,900,000	$ 16,700,000	$ 15,700,000
Number of our manufacturing facilities participating in multiemployer defined benefit pension plans | facility	1
Multiemployer Plans, Withdrawal Obligation	$ 75,000,000
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	7.70%
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 0.035
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	4.20%
Other Deferred Compensation Arrangements, Liability, Current and Noncurrent	$ 6,000,000	5,700,000
Defined Contribution Plan, Cost	$ 7,600,000	8,200,000	7,900,000
Maximum | Domestic equities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	10%
Maximum | International Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	10%
Maximum | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	90%
Maximum | Liquid reserves
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	5%
Minimum | Domestic equities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	5%
Minimum | International Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	5%
Minimum | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	80%
Minimum | Liquid reserves
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	0%
Pension Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 214,400,000	231,100,000	231,700,000
Employer contribution	1,100,000	$ 500,000
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	$ 700,000
Other Postretirement Employee Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate	6.30%	6.90%
Assumed health care cost trend rates, graded rate	6.30%	6.90%
Fair value of plan assets	$ 0	$ 0	0
Employer contribution	$ 4,100,000	$ 4,900,000
Assumed health care cost trend rates used to determine the company's benefit obligations and expense	7.10%	6.50%
Other Postretirement Employee Benefit Plans | OPEB Costs [Domain]
Defined Benefit Plan Disclosure [Line Items]
defined benefit plan, ultimate health care cost trend rates, with added benefits	4.50%	4.50%
Other Postretirement Employee Benefit Plans | OPEB Obligation
Defined Benefit Plan Disclosure [Line Items]
defined benefit plan, ultimate health care cost trend rates, with added benefits	4.50%	4.50%
Other Postretirement Employee Benefit Plans | Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate	3.70%	3.70%
Assumed health care cost trend rates, graded rate	3.70%	3.70%
Other Postretirement Employee Benefit Plans | Maximum | OPEB Costs [Domain]
Defined Benefit Plan Disclosure [Line Items]
defined benefit plan, ultimate health care cost trend rates, with added benefits	3.70%	3.70%
Other Postretirement Employee Benefit Plans | Maximum | OPEB Obligation
Defined Benefit Plan Disclosure [Line Items]
defined benefit plan, ultimate health care cost trend rates, with added benefits	3.70%	3.70%
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contribution	$ 500,000
Defined Benefit Plan, Accumulated Benefit Obligation	$ 2,600,000	$ 2,300,000
Postemployment Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate	2074	2074
Cost of Sales [Member]
Defined Benefit Plan Disclosure [Line Items]
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax	$ 2,200,000	$ 3,100,000
Selling, General and Administrative Expenses [Member]
Defined Benefit Plan Disclosure [Line Items]
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax	$ 600,000	$ 600,000	400,000
Non-operating expense [Member]
Defined Benefit Plan Disclosure [Line Items]
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax			$ 2,200,000

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive loss, net of tax	$ (34.5)	$ (30.7)
Net current period other comprehensive income ending balance	(3.8)	2.6	$ 9.3
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax	0.1	0.1	(1.6)
Defined Benefit Pension Plan Adjustments
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive loss, net of tax	(34.5)	(30.7)	(33.3)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(3.6)	2.8
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(0.3)	(0.2)
Net current period other comprehensive income ending balance		2.6
Pension Benefit Plans | Defined Benefit Pension Plan Adjustments
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive loss, net of tax	(47.8)	(42)	(46.5)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(6)	4.5
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0.1	0.1
Net current period other comprehensive income ending balance	(5.9)	4.6
Other Postretirement Benefits Plan [Member]
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive loss, net of tax	13.4	11.3	$ 13.3
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	2.4	(1.7)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(0.4)	(0.3)
Net current period other comprehensive income ending balance	$ 2.1	$ (2)

Earnings Per Share - Share Reco

Earnings Per Share - Share Reconciliation of Number of Common Shares Used in Calculating Basic and Diluted Net Earnings Per Share (Details) - $ / shares	3 Months Ended								12 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Weighted average number of shares outstanding, basic	16,724	16,620	16,661	16,607	16,638	16,682	16,865	16,834	16,781,000	16,863,000	16,985,000
Weighted average number of shares outstanding, diluted	16,724	16,620	16,661	16,607	16,638	16,895	16,958	17,036	16,781,000	17,091,000	17,181,000
Earnings per share, basic	$ 11.91	$ 0.35	$ (1.55)	$ 1.03	$ 1.06	$ 2.20	$ 1.76	$ 1.41	$ 11.70	$ 6.39	$ 2.71
Earnings per share, diluted	$ 11.91	$ 0.35	$ (1.55)	$ 1.03	$ 1.06	$ 2.17	$ 1.75	$ 1.40	$ 11.70	$ 6.30	$ 2.68
Anti-dilutive shares excluded from calculation									300,000	300,000	300,000
Restricted Stock Units (RSUs) [Member]
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements									0	148,000	196,000
Performance Shares [Member]
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements									0	80,000	0

Stockholders' Equity - Employee

Stockholders' Equity - Employee Plans Equity Based Compensation Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation expense	$ 5.6	$ 9.9	$ 12.7
Share-based Payment Arrangement, Expense, Tax Benefit	0.9	1.3	3.3
Payment, Tax Withholding, Share-based Payment Arrangement	4.1	4.7	2.5
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 12.9	14.7	9.5
Share based compensation awards vesting period	3 years
Cost of Sales [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement with Individual, Allocated Share-Based Compensation Expense	$ (0.3)
Selling, General and Administrative Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement with Individual, Allocated Share-Based Compensation Expense	(4.9)	(8)	(9.5)
Other Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement with Individual, Allocated Share-Based Compensation Expense	(0.4)	(0.9)	(0.9)
Discontinued Operations
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement with Individual, Allocated Share-Based Compensation Expense	$ (0.9)	$ (0.7)	$ (1.9)

Stockholders' Equity - Summary

Stockholders' Equity - Summary of Status of Outstanding RSU Awards (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Weighted Average Grant Date Fair Value
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 7.1
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price	$ 38.24
Restricted stock units
Number of share
Beginning Balance	402,407
Granted	221,319
Vested	(206,810)
Forfeited	(108,761)
Ending Balance	308,155	402,407
Weighted Average Grant Date Fair Value
Beginning Balance	$ 32.97
Granted	38.18	$ 37.66	$ 29.52
Vested	30.94
Forfeited	36.73
Ending Balance	$ 36.75	$ 32.97
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	1 year 10 months 24 days
Performance Shares [Member]
Number of share
Beginning Balance	225,104
Granted	163,310
Vested	(107,558)
Forfeited	0
Ending Balance	280,856	225,104
Weighted Average Grant Date Fair Value
Beginning Balance	$ 36.54
Granted	40.17	$ 40.47	$ 30.55
Vested	39.84
Forfeited	0
Ending Balance	$ 37.33	$ 36.54
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	0 years

Stockholders' Equity - Summar_2

Stockholders' Equity - Summary of Status of Outstanding Performance Share Awards (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]
Beginning Balance	285,682
Ending Balance		285,682
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 7.1
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price		$ 50.53
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 48.49
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	1 year 8 months 12 days	2 years 3 months 18 days
Performance shares
Number of share
Beginning Balance	225,104
Granted	163,310
Settled	(107,558)
Forfeited	0
Ending Balance	280,856	225,104
Weighted Average Grant Date Fair Value
Beginning Balance	$ 36.54
Granted	40.17	$ 40.47	$ 30.55
Settled	39.84
Forfeited	0
Ending Balance	$ 37.33	$ 36.54
Maximum | Performance shares
Number of share
Ending Balance	2
Minimum [Member] | Performance shares
Number of share
Ending Balance	0

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Oct. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred Stock, Shares Authorized	5,000,000
Preferred Stock, Par or Stated Value Per Share	$ 0.0001
Preferred Stock, Shares Issued	0
Shares Available For Grant	600,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares		285,682
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price		$ 50.53
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	1 year 8 months 12 days	2 years 3 months 18 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value		$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	34,430
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period	(62,638)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price	$ 63.40
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 48.49
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number	188,614
Share based compensation awards vesting period	3 years
Unrecognized compensation costs	$ 7.1
Share Repurchase Program, Authorized, Amount				$ 100
Share Repurchase Program, Remaining Authorized, Amount	$ 96.7
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Requisite service period of award	3 years
Equity Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award	ten years
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs, expected weighted-average period to be recognized (in years)	0 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number	107,558
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs, expected weighted-average period to be recognized (in years)	1 year 10 months 24 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number	206,810
Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation expense	$ (0.4)	0.9	$ 0.9
Deferred compensation share-based arrangements, liability, classified, noncurrent	(4.7)	(5.9)
Deferred Compensation Share-based Arrangements, Liability, Current	$ 0.8	$ 0.2

Commitments and Contingencies C

Commitments and Contingencies Commitments and Contingencies Additional Information (Details)	Dec. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Firm price contracts, percentage of expected average monthly natural gas and electricity needs covered	44%

Unusual or Infrequently Occur_2

Unusual or Infrequently Occurring Items (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)
Unusual or Infrequent Item, or Both [Line Items]
Unusual or Infrequent Item, or Both, Insurance Proceeds	$ 10.5
Discontinued Operations
Unusual or Infrequent Item, or Both [Line Items]
Unusual or Infrequent Item, or Both, Insurance Proceeds	0.9
Operating Segments | Continuing Operations
Unusual or Infrequent Item, or Both [Line Items]
Unusual or Infrequent Item, or Both, Insurance Proceeds	9.3
Insurance Claims [Member]
Unusual or Infrequent Item, or Both [Line Items]
Insurance Recoveries	5.8
Insurance Settlement [Member]
Unusual or Infrequent Item, or Both [Line Items]
Insurance Recoveries	4.7
Property, Plant and Equipment
Unusual or Infrequent Item, or Both [Line Items]
Unusual or Infrequent Item, or Both, Insurance Proceeds	$ 0.3

Segment Reporting (Details)

Segment Reporting (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	$ 387.1	$ 393.3	$ 344.4	$ 258.8	$ 268.6	$ 278.9	$ 291.3	$ 297.2	$ 1,383.6	$ 1,136	$ 1,195
Cost of Goods and Services Sold									1,307.5	935.3	982.5
Other Selling, General and Administrative Expense									112.7	114.7	105
Other Depreciation and Amortization	$ 21.5	$ 22.4	$ 17	$ 9	$ 10.3	$ 10.1	$ 10.2	$ 10	69.8	40.7	40.6
Segment Reporting, Other Segment Item, Amount									$ 35.7	2.9	22.3
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration]									Chief Executive Officer [Member]
Segment Reporting, CODM, Profit (Loss) Measure, How Used, Description									The measure used by our CODM to assess performance and make operating decisions is net income (loss) as reported on our consolidated statements of operations.
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									$ 1,383.6	$ 1,136	$ 1,195
Segment Reporting, Disclosure of Major Customers									10%	13%	10%
Labor and Overhead
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Cost of Goods and Services Sold									$ 482.2	$ 302.7	$ 298.7
Cost of Sales [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Cost of Goods and Services Sold									615	494.5	515.7
Supply Chain Costs
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Cost of Goods and Services Sold									140.1	105.3	119.5
Foodservice
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales									540.4	404.8	405.2
Folding Carton
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales									580.2	437.5	470.7
Sheeting and Distribution
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales									160.1	157.8	186
Other [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales									102.9	135.9	133.1
United States
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									1,252.5	1,028.4	1,097.7
Non-US [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									$ 131.2	$ 107.6	$ 97.3

Subsequent Events (Details)

Subsequent Events (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)
Minimum
Subsequent Event [Line Items]
Severance Costs	$ 5
Restructuring and Related Cost, Expected Cost	30
Maximum
Subsequent Event [Line Items]
Severance Costs	7
Restructuring and Related Cost, Expected Cost	$ 40

Interim Reporting (Details)

Interim Reporting (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 387.1	$ 393.3	$ 344.4	$ 258.8	$ 268.6	$ 278.9	$ 291.3	$ 297.2	$ 1,383.6	$ 1,136	$ 1,195
Gross Profit	14.7	30.1	(2)	33.3	35.9	50.7	49.9	64.2
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	(19.6)	(10.7)	(41.6)	(2.1)	(2.5)	14.9	11.9	24.5	(74)	48.7	52.7
Net earnings	$ 199.1	$ 5.8	$ (25.8)	$ 17.2	$ 17.6	$ 36.6	$ 29.7	$ 23.8	$ 196.3	$ 107.7	$ 46
Income (Loss) from Continuing Operations, Per Basic Share	$ (1.17)	$ (0.64)	$ (2.50)	$ (0.12)	$ (0.15)	$ 0.89	$ 0.71	$ 1.46	$ (4.41)	$ 2.89	$ 3.10
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share	13.08	1	0.95	1.16	1.21	1.31	1.05	(0.05)	16.11	3.50	(0.39)
Earnings per share, basic	11.91	0.35	(1.55)	1.03	1.06	2.20	1.76	1.41	11.70	6.39	2.71
Income (Loss) from Continuing Operations, Per Diluted Share	(1.17)	(0.64)	(2.50)	(0.12)	(0.15)	0.88	0.70	1.44	(4.41)	2.85	3.07
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	13.08	1	0.95	1.16	1.21	1.29	1.05	(0.04)	16.11	3.45	(0.39)
Earnings per share, diluted	$ 11.91	$ 0.35	$ (1.55)	$ 1.03	$ 1.06	$ 2.17	$ 1.75	$ 1.40	$ 11.70	$ 6.30	$ 2.68
Weighted average number of shares outstanding, basic	16,724	16,620	16,661	16,607	16,638	16,682	16,865	16,834	16,781,000	16,863,000	16,985,000
Weighted average number of shares outstanding, diluted	16,724	16,620	16,661	16,607	16,638	16,895	16,958	17,036	16,781,000	17,091,000	17,181,000
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	$ 218.8	$ 16.6	$ 15.7	$ 19.3	$ 20.2	$ 21.8	$ 17.8	$ (0.8)	$ 270.3	$ 59	$ (6.7)
Income tax (provision) benefit	(9.7)	(3.3)	(14.6)	0.5	0.2	3.7	4.3	8.7	(27.1)	16.9	29.2
Interest expense, net	5.3	13.1	9.6	1.2	1.6	2.2	2.9	2.8	29.2	9.5	11.2
Other Depreciation and Amortization	21.5	22.4	17	9	10.3	10.1	10.2	10	69.8	40.7	40.6
Depreciation and amortization									99.8	98.6	103.3
Inventory Adjustments	0	0	6.8	0	0	0	0	0	0	0
Debt retirement costs	9.1	0	0	0	3.1	0	0	0	9.1	3.1	0.5
Other operating charges, net	3.7	(0.3)	14.6	6	2.1	1.6	(0.1)	(0.4)
Other Nonoperating Income (Expense)	(0.7)	(0.3)	(0.3)	(0.3)	0.2	(0.1)	(0.1)	(0.1)	$ (1.8)	$ (0.1)	$ 5.7
Adjusted Earnings Before Interest, Taxes, Depreciation And Amortization (EBITDA)	$ 9.5	$ 20.9	$ (8.5)	$ 14.2	$ 14.9	$ 32.5	$ 29	$ 45.6