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Investment Commitment Investment commitment Product and Service [Axis] Product and Service Financial instruments. Financial Instruments [Abstract] Document Fiscal Period Focus Document Fiscal Period Focus Finance Lease, Liability, to be Paid Total lease payments Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years 2030 - 2035 Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-Term Rate of Return on Plan Assets Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost, Expected return on plan assets Weighted-Average expected return on plan assets for 2021 Capitalized Computer Software, Amortization Software amortization expense Liability, Defined Benefit Plan, Current Current liabilities Debt Instrument, Interest Rate, Stated Percentage Stated interest rate Englander. Englander [Member] Englander Revenue from Contract with Customer [Abstract] Entity Shell Company Entity Shell Company Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax Total recognized in other comprehensive loss income (b) Other Accrued Liabilities, Current Other Dividends, Common Stock, Cash Common stock dividends declared Represents the percentage of accounts receivable reserved for customer returns, allowances and earned discounts. Reserve Percentage For Customer Deductions Reserve for customer accounts receivable, percentage Non-operating pension income and expense Non Operating Pension Income Expense Non-operating pension income expense. Cash and Cash Equivalents Cash and Cash Equivalent Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value, Total Cash and Cash Equivalents, at Carrying Value, Beginning Balance Cash and Cash Equivalents, at Carrying Value, Ending Balance Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax Actuarial gain San Lorenzo, California member. San Lorenzo, California [Member] Defined Benefit Plan, Benefit Obligation Benefit obligation at plan year end Benefit obligation at beginning of period Goodwill impairment, income (loss) per share, diluted. Goodwill Impairment Income Loss Per Share Diluted Non-cash goodwill impairment charge, diluted per share Loss from catastrophes , income (loss) per share, diluted. Loss From Catastrophes Income Loss Per Share Diluted Charges related to the impact of Hurricane Laura, diluted per share Defined Benefit Plan, Expected Future Benefit Payment, Year Two 2027 Receivable Type [Axis] Receivable Type Cybersecurity Risk Management, Strategy, and Governance [Abstract] Common Stock, Shares, Issued Common stock, shares issued Common Stock, Shares, Issued, Total Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag] Cybersecurity Risk Board of Directors Oversight [Text Block] Statement [Table] Statement [Table] Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Increases related to current year tax positions Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Operating leases Internal Revenue Service (IRS) [Member] Internal Revenue Service (IRS) Leasehold improvements Leasehold improvements Business combination acquisition and integration related costs. Business Combination Acquisition And Integration Related Costs Acquisition and integration related costs Acquisition and integration related costs Payments to Acquire Businesses, Gross Cash paid for Greif Acquisition Asset Retirement Obligation Asset retirement obligation at end of period Asset retirement obligation at beginning of period Asset Retirement Obligation, Total Statement [Line Items] Statement [Line Items] Business Combination [Domain] Business Acquisition, Acquiree Revenue from Contract with Customer [Policy Text Block] Revenue Recognition Entity Filer Category Entity Filer Category Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Restricted Stock and Performance Units [Roll Forward] Represents number of acres of timberland under cutting right leases. 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Goodwill Impairment Loss After Tax Non-cash goodwill impairment charge, after tax Details of scheduled expiration dates of tax effected net operating loss and other tax carryforwards. Details Of Scheduled Expiration Dates Of Tax Effected Net Operating Loss And Other Tax Carryforwards Table [Text Block] Details of Scheduled Expiration Dates of Tax Effected Net Operating Loss (NOL) and Other Tax Carryforwards Loss Contingency Accrual, Insurance-related Assessment, Policy Surcharge Asset Property damage and business interruption insurance Restructuring Type [Axis] Restructuring Type Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset Finance Lease, Liability, to be Paid, Year Three 2028 Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Foreign currency translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent, Total Right of use assets obtained in exchange for new lease obligations. Right Of Use Assets Obtained In Exchange For New Lease Obligations [Abstract] Right-of-use assets obtained in exchange for new lease obligations: Trade. Trade [Member] Trade Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax, Total Amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of ($1.3) million, ($1.4) million, and ($2.1) million for 2025, 2024, and 2023, respectively Prepaid Expenses and Other Current Assets [Member] Prepaids and Other Assets [Member] Cybersecurity Risk Third Party Oversight and Identification Processes [Flag] Quarterly Financial Information Disclosure [Abstract] Unsecured Term Loan Facility [Member] Unsecured Term Loan Facility [Member] Unsecured Term Loan Facility Proceeds from Issuance of Debt Proceeds from issuance of debt, net of discount and lender fees Revenue from External Customers by Products and Services [Table Text Block] Segment Sales to External Customers by Product Line Derivative [Line Items] Derivative [Line Items] Share-based compensation expense and other (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, before Forfeiture The accumulated change in the value of either the projected benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption that has not been recognized in net periodic benefit cost, after tax. Also includes the cost (credit) resulting from a plan amendment that occurred during the period that has not been recognized in net periodic benefit cost, after tax. Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss And Net Prior Service Costs Arising During Period Net Of Tax Changes in unfunded employee benefit obligations, net of tax of $0.7 million, ($7.6) million, and ($7.8) million for 2025, 2024, and 2023, respectively A valuation allowance for trade and other receivables due to an entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible, and a reserve for estimated customer returns, allowances and earned discounts. Allowance For Doubtful Accounts Receivable And Reserve For Customer Deductions Current Allowance for credit losses and customer deductions Deferred Tax Assets, Valuation Allowance Valuation allowance Deferred Tax Assets, Valuation Allowance, Total Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Provision computed at U.S. federal statutory tax rate Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount, Total Nontaxable and nondeductible items Cybersecurity Risk Management Third Party Engaged [Flag] Documents Incorporated by Reference [Text Block] Documents Incorporated by Reference Securities at Fair Value [Member] Securities At Fair Value [Member] Total Securities at Fair Value Goodwill Ending Balance Beginning Balance Goodwill Goodwill, Total Effective Income Tax Rate Reconciliation, Percent Effective Income Tax Rate Reconciliation, Percent, Total Income Taxes Paid Cash payments for income taxes Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount Total fair value of plan assets Income Tax Jurisdiction [Axis] Income Tax Authority Asset Retirement Obligation, Accretion Expense Accretion expense Long-Term Marketable Debt Securities Debt Securities, Available-for-Sale, Noncurrent Long-term marketable debt securities Geographical [Domain] Geographical Asset retirement obligation revision of estimate adjustment. Asset Retirement Obligation Revision Of Estimate Adjustment Revisions in estimated cash flows adjustment Inventory, Finished Goods, Gross Finished goods Inventory, Finished Goods, Gross, Total Net Income (Loss) Available to Common Stockholders, Basic [Abstract] Numerator: Unrecorded Unconditional Purchase Obligation, Due in Next Rolling 12 Months 2026 Retirement Plan Tax Status [Domain] Retirement Plan Tax Status Segment, Expenditure, Addition to Long-Lived Assets Capital expenditures Summary of Components of Inventories Schedule of Inventory, Current [Table Text Block] Debt Securities, Available-for-Sale, Term Long-term marketable debt securities maturity period Accounts Receivable, Allowance for Credit Loss Allowance for doubtful accounts Accounts Receivable, Allowance for Credit Loss, Beginning Balance Accounts Receivable, Allowance for Credit Loss, Ending Balance Customer Customer [Member] Customer. Business Combination, Recognized Liability Assumed, Lease Obligation Long-term finance lease obligations Additional Paid in Capital, Common Stock Additional paid in capital Additional Paid in Capital, Common Stock, Beginning Balance Additional Paid in Capital, Common Stock, Ending Balance Debt Issuance Costs, Net Less unamortized debt issuance costs Debt Issuance Costs, Net, Total Less unamortized debt issuance costs Unsecured Revolving Credit Facility Unsecured revolving credit facility. Unsecured Revolving Credit Facility [Member] Unrealized loss on securities 1. Unrealized Loss On Securities1 Unrealized Loss Proceeds from maturities of held-to-maturity debt securities Proceeds from Sale and Maturity of Held-to-Maturity Securities Proceeds from Sale and Maturity of Held-to-Maturity Securities, Total Benefits paid Defined Benefit Plan, Plan Assets, Benefits Paid Cargo and Freight [Member] Freight Significant Accounting Policies [Text Block] Summary of Significant Accounting Policies Property, Plant and Equipment [Line Items] Property Plant And Equipment [Line Items] income of adjustment of required asset retirement obligation income of adjustment of required asset retirement obligation Finite-Lived Intangible Asset, Useful Life Intangible asset, useful life, in years Weighted Average Remaining Useful Life (in Years) Concentration Risk [Table] Concentration Risk [Table] Share-based payment award subject to adjustment based on the achievement of defined performance conditions. Performance Units [Member] Performance Units Performance Unit Awards Buildings machinery and equipment. Buildings Machinery And Equipment [Member] Buildings Machinery and Equipment Disaggregation of Revenue [Table] Disaggregation Of Revenue [Table] Cybersecurity Risk Management, Strategy, and Governance [Table] Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Computation of Basic and Diluted Income Per Common Share Net Amortization of Unrecognized Amounts [Abstract] Net Amortization of Unrecognized Amounts [Abstract] AOCI Attributable to Parent, Net of Tax [Roll Forward] Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] Trademarks and Trade Names [Member] Trademarks and Trade Names Concentration Risk Disclosure [Text Block] Concentration of Risk Percentage Of Customer Returns Allowances And Earned Discounts To Gross Selling Price Customer returns, allowances and earned discounts as a percentage of gross selling price Percentage of customer returns, allowances and earned discounts to gross selling price. Deferred Tax Assets, Operating Loss Carryforwards, Alternative [Abstract] Earnings Per Share, Basic Basic Basic income per common share (in dollars per share) Earnings Per Share, Basic, Total Disaggregation of Revenue [Table Text Block] Summary of Revenues Disaggregated by Product Line Retirement Benefits [Text Block] Employee Benefit Plans and Other Postretirement Benefits Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Weighted-Average Assumptions Used to Determine Benefit Obligation, Discount Rate Share-Based Payment Arrangement, Noncash Expense [Abstract] Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] Schedule of Cash and Available-For-Sale Debt Securities by Major Asset Category Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Asset disposals and write-offs Asset disposals and write-offs Total current assets Business Combination, Recognized Asset Acquired, Asset, Current Incremental out-of-pocket costs, after tax. Incremental Out Of Pocket Costs After Tax Incremental out-of-pocket costs, after tax Interest Income (Expense), Nonoperating Interest expense, net Revolving Credit Facility [Member] Retirement Plan Type [Domain] Retirement Plan Type Liabilities, Current Total current liabilities Income taxes line items. Income Taxes [Line Items] Income Taxes [Line Items] Increase (Decrease) in Accounts Receivable Accounts receivable Long-Term Purchase Commitment [Table Text Block] Schedule Of Purchase Commitments Lessee, Operating Lease, Liability, to be Paid, Year Five 2030 Revenues from External Customers and Long-Lived Assets [Line Items] Lessee operating and finance leases. Lessee Operating And Finance Leases [Text Block] Leases Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax Prior service credit Income Tax Paid, Federal, after Refund Received Income Tax Paid, Federal, after Refund Received, Total U.S. federal Domestic Tax Jurisdiction [Member] U.S. federal Deferred tax assets lease obligations. Deferred Tax Assets Lease Obligations Lease obligations Business Combination, Recognized Liability Assumed, Other Liability, Noncurrent Other long-term liabilities Effective Income Tax Rate Reconciliation [Table] Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Increases related to prior years’ tax positions Environmental Matters [Member] Environmental Matters [Member] Environmental Matters [Member] Consolidation Items [Domain] Consolidation Items Workforce Subject to Collective-Bargaining Arrangements Expiring within One Year [Member] Workforce Subject to Collective Bargaining Arrangements Expiring within One Year Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax Reclassification adjustments to cash flow hedges included in net income, tax Equity, Attributable to Parent [Abstract] Stockholders' equity: Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Summary of Changes in Pension Plans' Level 3 Assets Entity Small Business Entity Small Business Increase (Decrease) in Accrued Liabilities Accrued liabilities Increase (Decrease) in Accrued Liabilities, Total Retained Earnings (Accumulated Deficit) Retained earnings Retained Earnings (Accumulated Deficit), Total Retained Earnings (Accumulated Deficit), Beginning Balance Retained Earnings (Accumulated Deficit), Ending Balance Defined Benefit Plan, Funded (Unfunded) Status of Plan Defined Benefit Plan, Funded (Unfunded) Status of Plan, Total Overfunded (underfunded) status Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-Based Compensation Cost Restricted stock and performance units Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges Accumulated Net Gain Loss From Designated Or Qualifying Cash Flow Hedges1 [Member] Accumulated net gain loss from designated or qualifying cash flow hedges 1. Disclosure - Estimated Useful Lives of Assets [Abstract] Disclosure Estimated Useful Lives Of Assets [Abstract] Average remaining lifetime of inactive participants used for recognition of market-related value of assets. Average Remaining Lifetime Of Inactive Participants Used For Recognition Of Market Related Value Of Assets Average remaining lifetime of inactive participants used for recognition of market-related value of assets Nature of Operations [Text Block] Nature of Operations and Basis of Presentation OPEB plans OPEB Plans [Member] OPEB Plans [Member] Effective Income Tax Rate Reconciliation, Cross-Border Tax Effect, Amount Effective Income Tax Rate Reconciliation, Cross-Border Tax Effect, Amount, Total Effect of cross-border tax laws Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Share based compensation arrangement by share based payment award percentage of performance measurement based on total shareholder return. Share Based Compensation Arrangement By Share Based Payment Award Percentage Of Performance Measurement Based On Total Shareholder Return Percentage of ROIC as performance measure Current Foreign Tax Expense (Benefit) Foreign Share-Based Payment Arrangement [Text Block] Share-Based Compensation Organization, Consolidation and Presentation of Financial Statements [Abstract] Amortization of Deferred Charges Amortization of deferred financing costs Amortization of Deferred Charges, Total Lease Contractual Term [Axis] Lease Contractual Term Leases [Abstract] Years 11 through 20 [Member] Years11through20 [Member] 2035 Through 2044 Advance Packaging Corporation [Member] Advance Packaging Corporation [Member] Advance Packaging Corporation [Member] Unusual Risk or Uncertainty, Nature [Domain] Unusual Risk or Uncertainty, Nature Amendment Flag Amendment Flag Product and Service [Domain] Product and Service Components of Other Income (Expense), Net Schedule of Other Operating Cost and Expense, by Component [Table Text Block] Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Provision computed at U.S. federal statutory tax rate Corporate and other with eliminations. Corporate And Other With Eliminations [Member] Corporate and Other Tax effect of the accumulated change in the value of either the projected benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption that has not been recognized in net periodic benefit cost. Also includes the tax effect of the cost (credit) resulting from a plan amendment that occurred during the period that has not been recognized in net periodic benefit cost. Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss And Net Prior Service Costs Arising During Period Tax Changes in unfunded employee benefit obligations, tax Target allocation percentage of investments in U.S. equity securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position. U S Equity Securities [Member] U.S. Equity Securities Lessee operating and finance lease liability maturity. Lessee Operating And Finance Lease Liability Maturity Table [Text Block] Schedule of Future Minimum Payments Under Operating and Finance Lease Liabilities Finance Lease, Interest Expense Interest on lease liabilities Defined Benefit Plan, Equity Securities, US [Member] Domestic equities (Common/Collective Trust Funds) Concentration Risk [Line Items] Concentration Risk [Line Items] Liabilities and Equity [Abstract] LIABILITIES AND STOCKHOLDERS' EQUITY Entity Address, Postal Zip Code Entity Address, Postal Zip Code Trade Accounts Receivable, Allowances, and Customer Deductions Accounts Receivable [Policy Text Block] Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Net cash provided by operating activities Reporting Unit [Domain] Reporting Unit Capital loss carryforwards. Capital Loss Carryforwards U.S. federal and non-U.S. capital loss carryforwards Represents a reserve for customer returns, allowances and earned discounts. Reserve For Customer Deductions Reserve for customer deductions Financial instruments. Financial Instruments [Table] Financial Instruments [Table] Goodwill, Period Increase (Decrease), Total Goodwill, Period Increase (Decrease) Decrease in Goodwill Common Stock [Member] Common Stock Defined Benefit Plan, Accumulated Benefit Obligation Accumulated benefit obligation portion of above Inventories Business Combination, Recognized Asset Acquired, Inventory, Current Cybersecurity Risk Role of Management [Text Block] Tax Credit Carryforward, Amount U.S. federal tax credit carryforwards Long-Term Debt, Maturity, Year One 2026 Schedule of Health Care Cost Trend Rates [Table Text Block] Assumed Health Care Cost Trend Rates For Postretirement Benefits Assets for Plan Benefits, Defined Benefit Plan Noncurrent assets Lessee, Operating Lease, Liability, to be Paid, Year Three 2028 Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Less accumulated depreciation Less accumulated amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Total Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Beginning Balance Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance Other Operating Income (Expense), Net Other expense, net Other expense, net Total Total Schedule of commitments and contingencies. Schedule Of Commitments And Contingencies [Table] Schedule Of Commitments And Contingencies [Table] Accounts payable related to property plant and equipment Accounts Payable Related To Property Plant And Equipment Accounts Payable Related To Property Plant And Equipment Debt Securities, Available-for-Sale [Line Items] Schedule Of Available For Sale Securities [Line Items] Entity Address, Address Line One Entity Address, Address Line One Deferred Tax Liabilities, Gross Total deferred tax liabilities Deferred Tax Liabilities, Gross, Total Operating loss carryforwards and other tax carryforwards. Operating Loss Carryforwards And Other Tax Carryforwards [Line Items] Operating Loss Carryforwards And Other Tax Carryforwards [Line Items] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV Earnings Per Share [Abstract] Net income per common share: Income Tax, Policy [Policy Text Block] Income Taxes Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Flag] Estimated Interest Payments Year Five Estimated interest payments year five. Estimated interest payments for 2030 and thereafter Goodwill and Intangible Assets Disclosure [Text Block] Goodwill and Intangible Assets Current operating lease obligations Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Lease Obligation Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Lease Obligation Asset Retirement Obligation [Member] Asset Retirement Obligation [Member] Asset Retirement Obligation Defined Benefit Plan, Expected Future Benefit Payment, Year Four 2029 Statement of Financial Position Location, Balance [Axis] Balance Sheet Location Debt instrument redemption amount included premiums, accrued and unpaid interest. Debt Instrument Redemption Amount Included Premiums Accrued And Unpaid Interest Debt instrument, redemption amount included premiums, accrued and unpaid interest Changes in unrecognized tax benefits Effective Income Tax Rate Reconciliation Changes in Unrecognized Tax Benefits Percentage Effective Income Tax Rate Reconciliation Changes in Unrecognized Tax Benefits Percentage Operating Lease, Right-of-Use Asset Operating lease right-of-use assets Finance Lease, Liability, Undiscounted Excess Amount Less imputed interest Debt Securities, Available-for-Sale, Unrealized Loss Position Fair Value of Marketable Debt Securities Debt Securities, Available-for-sale, Unrealized Loss Position, Total Defined Benefit Plan, Plan Assets, Category [Domain] Defined Benefit Plan, Plan Assets, Category Deferred Tax Assets, Gross Gross deferred tax assets Cybersecurity Risk Board Committee or Subcommittee Responsible for Oversight [Text Block] Leases. Leases [Line Items] Leases [Line Items] Inventory Disclosure [Abstract] Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] Amounts Recognized in Accumulated Other Comprehensive Loss (Income) (Pre-Tax): Accrual for Environmental Loss Contingencies, Component Amount Environmental reserve Two Thousand And Eleven Interest Rate Protection Agreement [Member] Two Thousand And Eleven Interest Rate Protection Agreement [Member] 2011 Interest Rate Protection Agreement Document Type Document Type Goodwill and Intangible Assets, Policy [Policy Text Block] Goodwill and Intangible Assets Total Income Taxes Paid, Net Gross Profit Gross profit Gross profit Asset Retirement Obligation [Abstract] Entity Central Index Key Entity Central Index Key Asset Acquisition [Table] Investments, Debt and Equity Securities [Abstract] Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block] Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Net (decrease) increase in cash and cash equivalents Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment Plan amendments Debt refinancing. Debt Refinancing [Member] Debt Refinancing Common Stock, Par or Stated Value Per Share Common stock, par value (in dollars per share) Deferred Tax Assets, Tax Credit Carryforwards, General Business Capital loss and general business credit carryforwards Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other comprehensive income Goodwill [Line Items] Goodwill [Line Items] Incremental out-of-pocket costs, income (loss) per share, diluted. Incremental Out Of Pocket Costs Income Loss Per Share Diluted Incremental out-of-pocket costs, diluted per share Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest [Abstract] Income before income tax expense - Corporate Segment and Other Operating Segment [Member] Corporate and Other Document Financial Statement Error Correction [Flag] Depreciation, depletion, and amortization of intangibles Depreciation Depletion Amortization And Other Cash Flow Impact The aggregate non-cash expense recognized in the current period that allocates the cost of tangible and intangible assets to periods that benefit from use of the assets. Debt Disclosure [Abstract] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Defined Benefit Plans And Other Postretirement Benefit Plans Disclosures [Table] Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Foreign Currency Translation Adjustments Derivative [Table] Derivative [Table] State and Local Income Tax Expense (Benefit), Continuing Operations State and Local Income Tax Expense (Benefit), Continuing Operations, Total State and local Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income Accrued Liabilities, Current Accrued liabilities Total Payments for Legal Settlements Settlement amount paid DeRidder and other litigation DeRidder and other litigation Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] Operating lease right-of-use assets Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Operating Lease Right of Use Assets Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Operating Lease Right of Use Assets Current Fiscal Year End Date Current Fiscal Year End Date Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) Actual return on plan assets Schedule of Long-Term Debt Instruments [Table] Debt Instrument [Table] Payments for (Proceeds from) Hedge, Financing Activities Payments for (Proceeds from) settlement of interest rate protection agreement Payments for (Proceeds from) Hedge, Financing Activities, Total Business Combination, Recognized Asset Acquired, Other Asset, Noncurrent Other net assets Customer Relationships [Member] Customer Relationships Entity Address, State or Province Entity Address, State or Province Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Outstanding at January 1 Outstanding at December 31 Internal Use Software, Policy [Policy Text Block] Deferred Software Costs Common Stock Repurchases And Retirements, Shares Common stock repurchases and retirements, shares Common stock repurchases and retirements (in shares) Business Combination [Table Text Block] Schedule of Tangible and Intangible Assets Acquired and Liabilities Assumed Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive income Comprehensive income Research and Development Expense, Policy [Policy Text Block] Research and Development Accrued liabilities Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Current Liabilities Accrued Liabilities Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Current Liabilities Accrued Liabilities Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Effect of dilutive securities (in shares) Incremental Common Shares Attributable to Share-based Payment Arrangements, Total Defined Benefit Plan, Assumptions [Table Text Block] Weighted-Average Assumptions Used To Determine Benefit Obligations and Net Periodic Benefit Cost Risks and Uncertainties [Abstract] Geographical [Axis] Geographical Sales of plan assets that occurred during the period. Defined Benefit Plan Sales Sales Business Acquisition Cost Of Acquired Business Combination, Transaction Cost, Excluding Separately Recognized Transaction Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage Variable interest entity, ownership percentage Schedule of Marketable Debt Securities in Continuous Loss Position [Table Text Block] Schedule of Marketable Debt Securities in Continuous Loss Position [Table Text Block] Schedule of Marketable Debt Securities in Continuous Loss Position Accounts Receivable [Member] Total Company Receivables Inventory, Raw Materials, Gross Raw materials Inventory, Raw Materials, Gross, Total 3.05% Senior Notes, due October 2051 Three Point Zero Five Percentage Senior Note Due October Two Thousand And Fifty One Member Three Point Zero Five Percentage Senior Note Due October Two Thousand And Fifty One Member Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Domestic state and local income taxes, net of federal effect Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract] Changes in plan assets and benefit obligations recognized in other comprehensive (income) loss: Interest Costs Capitalized Interest capitalization, construction in progress Common stock withheld to cover taxes on vested and retired stock awards value during the period. Common Stock Withheld To Cover Taxes On Vested And Retired Stock Awards Value Common stock withheld and retired to cover taxes on vested stock awards Finance Lease, Liability, to be Paid, after Year Five Thereafter Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Deferred Income Tax Assets and Liabilities Tax effect of the adjustment out of other comprehensive income for prior service costs and net loss recognized as a component of net periodic benefit cost during the period. Other Comprehensive Income Amortization Of Defined Benefit Plan Net Prior Service Cost And Net Loss Recognized In Net Periodic Pension Cost Tax Amortization of pension and postretirement plans actuarial loss and prior service cost, tax Other Comprehensive Income (Loss), Net of Tax [Abstract] Statements of Comprehensive Income: Line item in the statement of financial position including long-term liabilities not elsewhere disclosed. Other Long Term Liabilities [Member] Other Long-Term Liabilities Packaging, and Corporate and Other. Packaging And Corporate And Other [Member] Packaging And Corporate And Other Other Postretirement Benefits Plan [Member] Postretirement Plans Long-Term Debt, Fair Value Long-term debt (fixed-rate debt), fair value Seven Year Farm Credit Loan Due September Two Thousand And Thirty Two [Member] Seven Year Farm Credit Loan Due September Two Thousand And Thirty Two [Member] 7 Year Farm Credit Loan, due September 2032 Marketable Securities, Policy [Policy Text Block] Marketable Debt Securities Pension and postretirement benefits Deferred Tax Liabilities Pension and Postretirement Benefits Deferred Tax Liabilities Pension and Postretirement Benefits Pension and postretirement benefits Property, Plant and Equipment [Abstract] Other Assets, Noncurrent Other long-term assets Other Assets, Noncurrent, Total Debt Securities, Available-for-Sale, Current Debt Securities, Available-for-sale, Current, Total Short-term marketable debt securities ($102.0 million and $93.5 million measured at fair value as of December 31, 2024 and December 31, 2023, respectively) Short-term marketable debt securities Deferred Tax Assets, Inventory Inventories Prepaid expenses and other current assets Business Combination, Recognized Asset Acquired, Prepaid Expense and Other Asset, Current Settlements with taxing authorities Unrecognized Tax Benefits, Increase Resulting from Settlements with Taxing Authorities Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Fair value of awards vested Share-Based Payment Arrangement, Expense, after Tax Impact on net income Proceeds from sales of available-for-sale debt securities Proceeds from Sale of Debt Securities, Available-for-Sale Three Point Six Five Senior Notes Due September Two Thousand And Twenty Four [Member] 3.65% Senior Notes, Due September 2024 Three point six five senior notes due september two thousand and twenty four. Debt, senior notes, discount Write-off unamortized debt discount Debt Instrument, Unamortized Discount Debt Instrument, Unamortized Discount, Total State and Local Jurisdiction [Member] State taxing jurisdiction Share-Based Payment Arrangement, Cost by Plan [Table Text Block] Compensation Expense for Share-Based Awards AOCI Attributable to Parent [Member] Accumulated Other Comprehensive Loss Customer [Domain] Customer Decreases related to prior years' tax positions Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name Goodwill, Impairment Loss Goodwill impairment Goodwill impairment charge Goodwill impairment Impairment of Paper segment Entity Number of Employees Number of employees of PCA Loss Contingency Accrual, Payments Loss Contingency Accrual Accrual settlement amount Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total Other intangible assets Assets acquired Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Deferred income tax provision (benefit) - Defined Benefit Plan, Equity Securities, Non-US [Member] International equities (Common/Collective Trust Funds) Selling, General and Administrative Expense Selling and administrative expenses Selling, General and Administrative Expense, Total Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income Debt Instrument, Maturity Date September 15, 2024 Equity Securities Defined Benefit Plan, Equity Securities [Member] Deferred Compensation Arrangement with Individual, Recorded Liability Deferred compensation liability Minimum [Member] Minimum Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Weighted Average Grant-Date Fair Value, Granted Financial Instrument [Axis] Financial Instrument Assets, Current [Abstract] Current assets: Quarterly Financial Information [Text Block] Quarterly Results of Operations (Unaudited) Amortization of Intangible Assets Amortization of Intangible Assets, Total Amortization expense Fair Value, Inputs, Level 3 [Member] Significant unobservable input (Level 3) Schedule of supplemental balance sheet information related to operating leases. Schedule Of Supplemental Balance Sheet Information Related To Operating Leases Table [Text Block] Schedule of Supplemental Balance Sheet Information Related to Operating Leases Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] Represents the low price of the Company's stock during the reporting period. Low Stock Price Per Share Stock price - low Segment Reporting [Abstract] Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Total Business Combination, Recognized Asset Acquired, Asset Assets acquired Deferred Tax Liabilities, Property, Plant and Equipment Property, plant and equipment Business Combination [Policy Text Block] Business Combinations Tax Period [Domain] Tax Period Fair Value, Assets Measured on Recurring Basis [Table Text Block] Schedule of Fair Value Measurements of Plan Assets by Major Asset Category Liabilities, Current [Abstract] Current liabilities: Regulatory Asset [Axis] Weighted average discount rate abstract. Weighted Average Discount Rate [Abstract] Weighted-average discount rate: Business Combination, Recognized Asset Acquired, Asset, Current [Abstract] Current Assets: Related Party Transactions [Abstract] Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities Accrued liabilities Shares, Outstanding Ending Balance (in shares) Beginning Balance (in shares) Sublease Income Sublease rental income Operating Loss Carryforwards Net Operating Loss Operating Loss Carryforwards, Total Adjustment of asset retirement obligation Adjustment Of Asset Retirement Obligation. Adjustment Of Asset Retirement Obligation Accounts Receivable, after Allowance for Credit Loss, Current, Total Accounts Receivable, after Allowance for Credit Loss, Current Accounts receivable, net, current Accounts receivable, net of allowance for credit losses and customer deductions of $17.0 million and $20.6 million as of December 31, 2025 and December 31, 2024, respectively Lessee, Operating Lease, Renewal Term Lease renewal term Income Tax Paid, by Individual Jurisdiction [Abstract] Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Reclassification Adjustment, before Tax Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Reclassification Adjustment, before Tax, Total Prior service credit Reporting Unit [Axis] Reporting Unit Commitments and Contingencies Commitments and contingent liabilities (Note 20) Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits Employee benefits and compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Total Defined Benefit Plan, Service Cost Service cost Revenue [Line Items] Revenue. Revenue [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Weighted Average Grant-Date Fair Value, Outstanding at January 1 Weighted Average Grant-Date Fair Value, Outstanding at December 31 Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification Out Of Accumulated Other Comprehensive Income [Table] Inventory, Work in Process, Gross Work in process Operations outside of the United States of America [Member] Foreign Operations [Member] Foreign operations Total operating lease obligations Operating Lease, Liability Total operating lease obligations Present value of lease liabilities Auditor Firm ID Auditor Firm ID Capitalized Computer Software, Net Net capitalized software costs Capitalized Computer Software, Net, Total Capitalized Computer Software, Net, Beginning Balance Capitalized Computer Software, Net, Ending Balance Schedule of Goodwill [Table Text Block] Schedule of Goodwill Accrued Liabilities [Abstract] Customer rebates and other credits Customer rebates and other credits Accrued Marketing Costs, Current Loss from Catastrophes Charges related to the impact of Hurricane Laura Charges related to the impact of Hurricane Laura Decrease in Unrecognized Tax Benefits is Reasonably Possible Reasonably possible decrease in unrecognized tax benefits related to state apportionment issues in next 12 months Concentration Risk Benchmark [Axis] Concentration Risk Benchmark Estimated Interest Payments Year Three Estimated interest payments year three. Estimated interest payments for 2028 Asset Retirement Obligation, Cash Paid to Settle Payments Corrugated Products Facilities Corrugated products facilities member. Corrugated Products Facilities [Member] Long-Term Debt, Maturity, Year Two 2027 Variable Interest Entity, Primary Beneficiary [Member] Variable Interest Entity Proceeds from Legal Settlements DeRidder and other litigation insurance recoveries Finance Lease, Liability, Current Finance lease obligations Current portion of finance lease obligations Finance Lease, Weighted Average Discount Rate, Percent Finance leases Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Changes in valuation allowance Liabilities, Noncurrent [Abstract] Long-term liabilities: Time Deposits Bank Time Deposits [Member] Interest Income (Expense), Operating Interest expense, net Interest Income (Expense), Net, Total Interest expense, net Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total Lease Contractual Term [Domain] Lease Contractual Term Disclosure of accounting policy for transactions under trade agreements. Trade Agreements Policy [Text Block] Trade Agreements Represents percentage of hourly employees represented by unions. Percentage Of Hourly Employees Represented By Unions Percentage of hourly employees represented by unions Business Combination, Recognized Asset Acquired, Cash and Cash Equivalent Cash Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Other Item Other, net Officers and employees. Officers And Employees [Member] Officers and Employees Revised Allocation [Member] Revised Allocation [Member] Revised Allocation 3.00% Senior Notes, Due December 2029 Three Point Zero Zero Percentage Senior Notes Due December Two Thousand And Twenty Nine [Member] Three Point Zero Zero Percentage Senior Notes Due December Two Thousand And Twenty Nine [Member] Long-Term Debt, Type [Domain] Long-term Debt, Type Cybersecurity Risk Management Positions or Committees Responsible [Text Block] Weighted Average Number of Shares Outstanding, Basic Weighted average common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic, Total Goodwill, Acquired During Period Acquisitions Estimated Interest Payment Next Twelve Months Estimated interest payment next twelve months. Estimated interest payments for 2026 Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] Change in Fair Value of Plan Assets [Roll Forward] Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Summary of Effective Tax Rate Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Unrealized Losses 12 Months Or Longer Fair Value Measured at Net Asset Value Per Share [Member] Net Asset Value (NAV) Segments [Axis] Segments Long-Lived Tangible Asset [Domain] Long-Lived Tangible Asset Liabilities Incurred Asset Retirement Obligation, Liabilities Incurred Cybersecurity Risk Process for Informing Management or Committees Responsible [Text Block] Net Working Capital Adjustment Net Working Capital Adjustment Net working capital adjustment (receivable at December 31, 2025) Deferred Tax Assets, Net [Abstract] Deferred tax assets: Tax Credits Effective Income Tax Rate Reconciliation, Tax Credit, Percent Effective Income Tax Rate Reconciliation, Tax Credit, Percent, Total Tax Credits Total Total Long-Term Debt Credit Agreement Related Party Transactions Disclosure [Text Block] Transactions With Related Parties Revenue from External Customer [Line Items] Revenue from External Customer [Line Items] Share-based compensation and other APIC, Share-Based Payment Arrangement, Increase for Cost Recognition APIC, Share-based Payment Arrangement, Increase for Cost Recognition, Total Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) Actuarial (gain) loss (a) Paper Reporting Unit Paper Reporting Unit [Member] Paper reporting unit. Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Changes in valuation allowance Equity, Attributable to Parent Ending balance Beginning balance Total stockholders' equity Unrecorded Unconditional Purchase Obligation, to be Paid, Year Five 2030 Fixed costs Fixed Costs [Member] Fixed Costs Statement of Stockholders' Equity [Abstract] Represents the percentage of base pay for service-related Company retirement contributions to a defined contribution plan. Company Retirement Contribution Percentage Company's contribution to pension plan, percentage Share based compensation arrangement by share based payment award award vesting period performance measurement based on total shareholder return. Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period Performance Measurement Based On Total Shareholder Return Vesting period of TSR as performance measure Marketable Security, Gain (Loss) Marketable Security, Gain (Loss), Total Other-than-temporary impairment charges on available-for-sale securities Financial Instruments. Financial Instruments [Line Items] Financial Instruments [Line Items] Type of Restructuring [Domain] Type of Restructuring (Increase) decrease in assets - Increase (Decrease) in Operating Assets [Abstract] Use of Estimates, Policy [Policy Text Block] Use of Estimates Equity Method Investment [Table] Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment, Total Property, plant, and equipment Fixed Income Securities [Member] Fixed Income Securities Cash paid for amounts included in measurement of lease liabilities. Cash Paid For Amounts Included In Measurement Of Lease Liabilities [Abstract] Cash paid for amounts included in the measurement of lease liabilities: Long-Term Debt, Maturity, Year Five 2030 and thereafter Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Leasehold Improvements [Member] Leasehold Improvements Allowance for credit loss Financing Receivable, Allowance for Credit Loss Financing Receivable, Allowance for Credit Loss, Ending Balance Financing Receivable, Allowance for Credit Loss, Beginning Balance OCI, before Reclassifications, Net of Tax, Attributable to Parent Other comprehensive income before reclassifications Quarterly Financial Data [Line Items] Quarterly Financial Data [Line Items] Quarterly Financial Data [Line Items] Total income tax provision - Federal Income Tax Expense (Benefit), Continuing Operations [Abstract] Fixed-Rate Senior Notes Fixed Rate Senior Notes [Member] Fixed-rate senior notes. Accrued Income Receivable [Member] Accrued Expenses and Receivables Purchases of held-to-maturity debt securities Payments to Acquire Held-to-Maturity Securities Investment Owned, Fair Value Fair Value Investment Owned, at Fair Value, Beginning Balance Investment Owned, at Fair Value, Ending Balance UNITED STATES U.S Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Unfunded Employee Benefit Obligations Buildings And Land Improvements [Member] Buildings And Land Improvements [Member] Buildings And Land Improvements Wood Products, Including Chips and Logs [Member] Wood Products Including Chips And Logs [Member] Wood Products, Including Chips and Logs Entity Incorporation, Date of Incorporation Date of incorporation Schedule of Accrued Liabilities [Table Text Block] Components of Accrued Liabilities Debt Instrument, Name [Domain] Debt Instrument, Name Regulatory Asset [Domain] Long-Term Debt, Maturity, Year Four 2029 Business Acquisition, Effective Date of Acquisition Business Combination, Effective Date of Acquisition Business acquisition, effective date of acquisition Unrealized Loss (Gain) on Marketable Debt Securities Marketable Debt Securities [Member] Marketable debt securities. Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] Summary of Changes Related to PCA's Gross Unrecognized Tax Benefits Excluding Interest and Penalties Derivative Instruments and Hedging Activities Disclosure [Abstract] Other segment items Segment Reporting, Other Segment Item, Amount Plan Name [Domain] Asset Retirement Obligation Disclosure [Text Block] Asset Retirement Obligations Revenue [Table] Revenue [Table] Revenue. Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] Entity [Domain] Entity Building [Member] Buildings Credit Facility [Axis] Credit Facility Cost of Product and Service Sold Cost of sales Cost of Goods and Services Sold, Total Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Text Block] Current State and Local Tax Expense (Benefit) State and local Schedule of Expected Benefit Payments [Table Text Block] Schedule of Estimated Benefit Payments Cybersecurity Risk Management Expertise of Management Responsible [Text Block] Finance Lease, Liability, to be Paid, Year One 2026 Certificates of Deposit [Member] Certificates of Deposit Service Related Contributions [Member] Service Related Contributions [Member] Service Related Contributions Deferred Charges, Policy [Policy Text Block] Deferred Debt Issuance Costs Tax Period [Axis] Tax Period Other Noncurrent Assets Other Noncurrent Assets [Member] Lessee, Operating Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract] Operating leases Restructuring Plan [Axis] Restructuring Plan Environmental Remediation Contingency [Axis] Environmental Remediation Contingency Related and Nonrelated Parties [Axis] Related Party Acquisitions Asset Acquisition [Text Block] Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Other Adjustments Foreign Tax Jurisdiction [Member] Non U.S. taxing jurisdiction Estimated Interest Payments Year Two Estimated interest payments year two. Estimated interest payments for 2027 Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract] Pension Plan [Member] Pension Plans Property, Plant and Equipment, Policy [Policy Text Block] Property, Plant, and Equipment Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), after Adjustments, Tax Income tax benefit from stranded tax effects in accumulated OCI related to write-off of remaining treasury lock Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), after Adjustments, Tax, Total Common stock withheld to cover taxes on vested stock awards during the period. Common Stock Withheld To Cover Taxes On Vested Stock Awards Common stock withheld and retired to cover taxes on vested stock awards (in shares) Unrealized Loss on Foreign Exchange Contracts Foreign Exchange Contract [Member] Entity Address, City or Town Entity Address, City or Town Unusual Risk or Uncertainty, Nature [Axis] Unusual Risk or Uncertainty, Nature Long-Term Purchase Commitment, Period Purchase commitments term, years Number of Reportable Segments Number of reportable segments Security Exchange Name Security Exchange Name Credit Facility [Domain] Credit Facility Other Adjustments Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Other Adjustments Buildings Property, Plant and Equipment, Gross Total Property, Plant and Equipment, Gross, Total Property, Plant and Equipment, Gross, Beginning Balance Property, Plant and Equipment, Gross, Ending Balance Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Current income tax provision - Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Intersegment eliminations Intersegment Eliminations [Member] Intersegment Eliminations 5.70% Senior Notes, Due December 2033 Five Point Seven Zero Percentage Senior Notes Due December Two Thousand and Thirty Three [Member] Five Point Seven Zero Percentage Senior Notes Due December Two Thousand and Thirty Three. Counterparty Name [Axis] Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income before taxes Income before taxes Concentration Risk Type [Domain] Concentration Risk Type Recorded Unconditional Purchase Obligation, to be Paid, Year Two 2029 Finance Lease, Liability, to be Paid, Year Five 2030 Other Accrued Liabilities [Member] Accrued Liabilities [Member] Investment Owned, Cost Adjusted Cost Basis Co-venturer [Member] Boise Cascade Co-Owner of LTP Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent Foreign tax effects Inventory, Net Inventories Inventories Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Table] Statistical Measurement [Domain] Statistical Measurement Deferred Policy Acquisition Cost [Table] Assets, Current Total current assets Share-Based Payment Arrangement, Expense Impact on income before income taxes Net sales revenue goods. Net Sales Revenue Goods [Member] Total Company Sales Revenue Office Depot. Office Depot [Member] Office Depot Document Period End Date Document Period End Date 4.05% Senior Notes, Due December 2049 Four point zero five percentage senior notes due december two thousand and forty nine. Four Point Zero Five Percentage Senior Notes Due December Two Thousand And Forty Nine [Member] Other Income and Expenses [Abstract] Reportable segment - Packaging. Packaging [Member] Packaging Title and Position [Axis] Title of Individual Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV Defined Contribution Plan, Cost Company's contribution to defined contribution plans ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag Defined Benefit Plan, Benefit Obligation, Benefits Paid Benefits paid Defined Benefit Plan, Pension Plan Benefit Obligation in Excess of Plan Assets, Plan Assets Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets Environmental Costs, Capitalization Policy [Policy Text Block] Environmental Matters Participating Securities, Distributed and Undistributed Earnings (Loss), Basic Less: Distributed and undistributed earnings allocated to participating securities Finance leases. Finance Leases [Member] Finance Leases Packaging and Paper Packaging And Paper [Member] Packaging and paper. Weighted average useful life of intangible asset acquired Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life 3.05% Senior Notes, Due October 2051 3.05% Senior Notes due in October 2051 [Member] Three Point Zero Five Percentage Senior Notes Due October Two Thousand And Fifty One [Member] Statement of Financial Position [Abstract] Domestic and foreign tax authority. Domestic And Foreign Tax Authority [Member] U.S. federal and non-U.S. Cumulative Effect, Period of Adoption, Adjustment [Member] Cumulative Effect Period of Adoption Adjustment Payment of civil penalty Payment of civil penalty Payment of civil penalty Finance lease cost. Finance Lease Cost Total finance lease cost Line of Credit [Member] Line of Credit Jackson, Alabama mill. Jackson Alabama Mill [Member] Jackson, Alabama Mill Reclassification out of Accumulated Other Comprehensive Income [Member] Reclassification out of Accumulated Other Comprehensive Income [Member] Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions Number of Marketable Debt Securities in a Loss Position Deferred Tax Liabilities, Net Net deferred tax liabilities Deferred Tax Liabilities, Net, Total Restructuring and Related Cost, Accelerated Depreciation Incremental depreciation Senior notes three point nine percentage senior notes. Senior Notes Three Point Nine Percentage Senior Notes [Member] 3.90% Senior Notes, due June 2022 Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] Defined Benefit Plan, Plan Assets, Contributions by Plan Participant Participant contributions Leases [Table]. Leases [Table] Leases [Table] Debt Instrument, Unused Borrowing Capacity, Amount Unused borrowing capacity Current Income Tax Expense (Benefit) Total current provision for taxes Summary of Components of Changes in Accumulated Other Comprehensive Income (AOCI) Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] Cybersecurity Risk Management, Strategy, and Governance [Line Items] Finance Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract] Finance leases Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent Effect of changes in tax laws or rates enacted in current period Schedule of Change in Asset Retirement Obligation [Table Text Block] Changes to Asset Retirement Obligation Liabilities Liabilities Liabilities, Total Repayments of Debt and Lease Obligation Repayments of debt and finance lease obligations Weighted average remaining lease term abstract. Weighted Average Remaining Lease Term [Abstract] Weighted-average remaining lease term (years): Boise Inc. [Member] Boise Inc [Member] Boise Inc. Financial Instruments [Domain] Financial Instruments Schedule of Cash Payments for Federal, State and Foreign Income Taxes [Table TextBlock] Schedule of Cash Payments for Federal, State and Foreign Income Taxes [Table TextBlock] Schedule of Cash Payments for Federal, State and Foreign Income Taxes Operating loss carryforwards and other tax carryforwards. Operating Loss Carryforwards And Other Tax Carryforwards [Table] Operating Loss Carryforwards And Other Tax Carryforwards [Table] Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. Also includes tabular disclosure of the changes in plan assets and benefit obligations recognized in other comprehensive income (loss) during the period. Schedule Of Net Benefit Costs And Amounts Recognized Other Comprehensive Income Loss Table [Text Block] Components of Net Periodic Benefit Costs and Other Comprehensive (Income) Loss (Pretax) Other-than-temporary Impairment Loss, Debt Securities, Available-for-Sale Other-than-temporary impairment charges on available-for-sale securities Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Total Common Stock Dividends, Shares Common Stock Dividends, Shares Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount Foreign tax effects Operating Lease, Lease Income, Lease Payments Operating lease obligations Lessee, Operating Lease, Liability, to be Paid, Year Two 2027 Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Disposal Groups, Including Discontinued Operations [Table] Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Table] Restricted Stock [Member] Restricted Stock Finance Lease, Right-of-Use Asset, Amortization Amortization of finance lease assets Dividends Payable, Current Dividends payable Finite-Lived Intangible Assets, Gross Gross Carrying Amount Finite-Lived Intangible Assets, Gross, Total Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Unrealized Losses Less Than 12 Months Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions Number of Marketable Debt Securities in a Loss Position 12 Months Or Longer Weighted Average Number of Shares Outstanding, Diluted Diluted common shares outstanding (in shares) Securities Act File Number Entity File Number Payments of Ordinary Dividends, Common Stock Common stock dividends paid Common stock dividends paid OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax Changes in unrealized gains on marketable debt securities, net of tax of $0.0 million, ($0.1) million, and ($0.6) millionfor 2025, 2024, and 2023, respectively Statement of Financial Position Location, Activity, Capitalization [Axis] Derivative Instruments, Gain (Loss) [Table Text Block] Impact of Derivative Instruments on Consolidated Statements of Income and Accumulated OCI Cover [Abstract] Unrecorded Unconditional Purchase Obligation, to be Paid, Year Two 2027 Purchase obligation, term Unrecorded Unconditional Purchase Obligation, Term Cumulative Effect, Period of Adoption [Axis] Cumulative Effect, Period of Adoption Prepaid Expense and Other Assets, Current Prepaid expenses and other current assets Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Forfeitures Fiber [Member] Fiber [Member] Fiber Business exit and other costs. Business Exit And Other Costs Facilities closure and other costs Facilities closure and other income (costs) Environmental Remediation Contingency [Domain] Environmental Remediation Contingency Estimated Interest Payments Year Four Estimated interest payments year four. Estimated interest payments for 2029 Loss Contingency, Receivable, Current Loss Contingency, Receivable, Current Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3 Transfer out of the Level 3 fair value Amortization of net (loss) gain on treasury lock Derivative, Gain (Loss) on Derivative, Net Derivative, Gain (Loss) on Derivative, Net, Total Operating loss carryforwards capital loss carryforwards and tax credit carryforwards. Operating Loss Carryforwards Capital Loss Carryforwards And Tax Credit Carryforwards Total Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Total Net Sales [Member] Revenue Benchmark [Member] US Treasury Securities [Member] U.S. Treasury Securities Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Number of shares authorized under plan Segment Reporting Disclosure [Text Block] Segment Information Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Noncash Item [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Settlement of Pre Existing Relationships Settlement of Pre Existing Relationships Settlement of pre-existing relationships Business Combination, Recognized Liability Assumed, Accounts Payable, Current Accounts payable Derivative gain loss on derivative net of tax. Derivative Gain Loss On Derivative Net Of Tax Amortization of treasury lock settlements, after tax Finite-Lived Intangible Assets, Net Other intangible assets, net Finite-Lived Intangible Assets, Net, Total Finite-Lived Intangible Assets, Net, Beginning Balance Finite-Lived Intangible Assets, Net, Ending Balance Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount Effect of changes in tax laws or rates enacted in current period Business Combination, Series of Individually Immaterial Business Combinations [Member] Lessor, Leases [Policy Text Block] Leases Restructuring Charges Restructuring charges Restructuring charges Restructuring Charges, Total Property, Plant and Equipment, Useful Life Property, Plant and Equipment, Useful Life New Accounting Pronouncements, Policy [Policy Text Block] Recently Adopted Accounting Standards Derivative Instruments, Gain (Loss) [Table] Derivative Instruments Gain Loss By Hedging Relationship By Income Statement Location By Derivative Instrument Risk [Table] Gain (Loss) on Disposition of Assets Charges for disposal of fixed assets Net loss on asset disposals Gain (Loss) on Disposition of Assets, Total Disclosure Fair Value Measurements of Plan Assets [Abstract] Disclosure Fair Value Measurements Of Plan Assets [Abstract] Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Vesting period Other Capitalized Property Plant and Equipment [Member] Other Business Combination, Recognized Liability Assumed, Liability Business Combination, Recognized Liability Assumed, Liability, Total Liabilities assumed Changes in unrecognized tax benefits Unrecognized Tax Benefits, Period Increase (Decrease) Unrecognized Tax Benefits, Period Increase (Decrease), Total Income (Loss) from Continuing Operations before Income Taxes, Domestic U.S. Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract] Amount Depreciation Depreciation expense Depreciation, Total Represents the high price of the Company's stock during the reporting period. High Stock Price Per Share Stock price - high Defined Benefit Plan, Ultimate Health Care Cost Trend Rate Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) Restructuring and related cost, income (loss) per share, diluted. Restructuring And Related Cost Income Loss Per Share Diluted Restructuring charges, diluted per share Depletion, Total Depletion Depletion expense Lessee, Operating Lease, Term of Contract Lease term Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage Percentage of Fair Value Operating Lease, Liability, Current Current portion of operating lease obligations Operating lease obligations Technology Equipment [Member] Computers and Hardware Depreciation, Depletion and Amortization Depreciation, Amortization, and Depletion Depreciation, Depletion and Amortization, Total Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Amortization of prior service costs Prior service credit Cybersecurity Risk Management Processes Integrated [Flag] Document Transition Report Document Transition Report Matching Contributions [Member] Matching Contributions [Member] Matching Contributions Accrued Liabilities, Current [Abstract] Investment in debt security held-to-maturity Debt Securities, Held-to-Maturity, Fair Value Debt Securities, Held-to-Maturity, Fair Value, Total Thereafter Unrecorded Unconditional Purchase Obligation, to be Paid, after Year Five Receivable [Domain] Receivable Next 10 Years [Member] [Member] Next10 Years Member [Member] 2025 Through 2034 Repurchases of common stock Repurchases of common stock Payments for Repurchase of Common Stock Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component Non-operating pension (expense) income Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Components of Consolidated Income Tax Provision Liability, Defined Benefit Plan, Noncurrent Liability, Defined Benefit Plan, Noncurrent, Total Compensation and benefits Noncurrent liabilities Statement of Cash Flows [Abstract] Greif Acquisition [Member] Greif Acquisition [Member] Greif Acquisition Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Restricted Stock and Performance Units (Weighted Average Grant-date Fair Value) [Abstract] Indefinite Indefinite [Member] Indefinite Current Federal Tax Expense (Benefit) U.S. federal Payments to Acquire Businesses, Net of Cash Acquired Total purchase consideration Acquisition of business, net of cash acquired Equity [Text Block] Stockholders' Equity Pension and Other Postretirement Plans, Policy [Policy Text Block] Pension and Postretirement Benefits Finite-Lived Intangible Assets [Line Items] Finite Lived Intangible Assets [Line Items] Earnings Per Share [Text Block] Earnings Per Share Unrecognized Tax Benefits that Would Impact Effective Tax Rate Unrecognized tax benefits that would impact of effective tax rate Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] Summary of Restricted Stock Activity Cybersecurity Risk Management Processes Integrated [Text Block] Quantity of Production Quantity of Production Quantity of Production Net income Net income Recorded Unconditional Purchase Obligation Roundwood Logs Recorded Unconditional Purchase Obligation Roundwood Logs Purchase obligation of roundwood logs Iin tons Increase (Decrease) in Inventories Inventories Increase (Decrease) in Inventories, Total Pre Tax Restructuring Charges Pre Tax Restructuring Charges Pre-tax restructuring charges DeRidder, Louisiana. De Ridder Louisiana [Member] DeRidder, Louisiana Recorded Unconditional Purchase Obligation, to be Paid, Year Three 2030 Operating Lease, Cost Operating lease cost Income Taxes Receivable, Current Federal and state income taxes receivable Other securities. Other Securities [Member] Other Securities Environmental Contingencies [Member] Environmental Contingencies [Member] Environmental Contingencies Operating Lease, Payments Operating cash flows for operating leases Related Parties Amount in Cost of Sales Fiber costs from related parties Asset Retirement Obligation, Revision of Estimate Revisions in estimated payments Assets [Abstract] ASSETS Income Tax Authority, Name [Axis] Income Tax Authority, Name Price Of Acquisition Expected Business Combination, Price of Acquisition, Expected Recorded Unconditional Purchase Obligation, to be Paid, Year One 2028 Construction in Progress [Member] Construction in Progress Increase (Decrease) in Prepaid Expense and Other Assets Prepaid expenses and other current assets Increase (Decrease) in Prepaid Expense and Other Assets, Total Wallula, Washington Mill [Member] Wallula Washington Mill [Member] Wallula, Washington Mill Document Fiscal Year Focus Document Fiscal Year Focus Represents amounts paid in current period under long-term purchase agreements. Current Period Purchases Under Long Term Purchase Agreements Purchases during period under purchase agreements Concentration Risk Benchmark [Domain] Concentration Risk Benchmark Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Cash Flows from Investing Activities: Retirement Benefits [Abstract] Cloud computing arrangements. Cloud Computing Arrangements Cloud computing arrangements Accounts Payable, Current Accounts payable Accounts Payable, Current, Total 2008 Interest Rate Protection Agreement Two Thousand And Eight Interest Rate Protection Agreement Two Thousand And Eight Interest Rate Protection Agreement [Member] Interest Paid, Including Capitalized Interest, Operating and Investing Activities Interest payments Interest Paid, Including Capitalized Interest, Operating and Investing Activities, Total Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations Expiration of the statute of limitations Adjustments to Additional Paid in Capital, Other Other Schedule of Net Benefit Costs [Table Text Block] Schedule of Net Benefit Costs Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant Participant contributions Proceeds from Sale of Productive Assets Proceeds from asset disposals Proceeds from Sale of Productive Assets, Total Deferred Federal Income Tax Expense (Benefit) U.S. federal Finite-Lived Intangible Asset, Expected Amortization, Year One 2026 Revision of Prior Period [Domain] Revision of Prior Period Real estate leases. Real Estate Leases [Member] Real Estate Leases Fair Value Measurement, Policy [Policy Text Block] Fair Value Measurements DeRidder louisiana mill. DeRidder Louisiana Mill [Member] DeRidder, Louisiana Mill Schedule of Unrealized Loss on Investments [Table Text Block] Schedule of Marketable Debt Securities in Continuous Loss Position Private Equity Funds [Member] Private Equity Securities Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill [Abstract] Intangible assets: Wallula mill restructuring Wallula Mill Restructuring Wallula Mill Restructuring Wallula mill restructuring Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase Weighted-Average Assumptions Used to Determine Benefit Obligations, Rate of compensation increase Commitments and Contingencies Disclosure [Abstract] Derivatives, Methods of Accounting, Hedging Derivatives [Policy Text Block] Derivative Instruments and Hedging Activities Effective Income Tax Rate Reconciliation, Tax Credit, Amount Effective Income Tax Rate Reconciliation, Tax Credit, Amount, Total Tax Credits Tax Credits Lessee, Operating Lease, Liability, to be Paid, Year One 2026 Operating Leases, Rent Expense Total lease expense Operating Leases, Rent Expense, Total Net Income (Loss) Available to Common Stockholders, Basic Net income attributable to common stockholders Deferred tax liabilities right-of-use assets. Deferred Tax Liabilities Right Of Use Assets Right-of-use assets New accounting standards not yet adopted. New Accounting Standards Not Yet Adopted Policy [Text Block] New Accounting Standards Not Yet Adopted Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table] Debt Securities Available For Sale Unrealized Loss Position Fair Value [Table] Effective Income Tax Rate Reconciliation [Line Items] Income Tax Examination, Description Income tax examination (description) Debt Instrument [Axis] Debt Instrument Long-Term Debt, Percentage Bearing Fixed Interest, Amount Book value of fixed rate debt Derivative Instrument [Axis] Derivative Instrument Lessee, Operating Lease, Liability, to be Paid, after Year Five Thereafter Defined Benefit Plan, Interest Cost Interest cost Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Unrecognized compensation expense Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total Restructuring charges, after tax Restructuring and related cost, after tax. Restructuring And Related Cost After Tax Increase (Decrease) in Operating Liabilities [Abstract] Increase (decrease) in liabilities — Payments for proceeds from seller, Payments For Proceeds From Seller Payments for proceeds from seller Concentration Risk, Percentage Concentration risk, percentage Defined Benefit Plan, Expected Future Benefit Payment, Year One 2026 Average remaining service period of active employees used for recognition of market-related value of assets. Average Remaining Service Period Of Active Employees Used For Recognition Of Market Related Value Of Assets Average remaining service period of active employees used for recognition of market-related value of assets Summary of Property, Plant and Equipment Estimated Useful Lives Property, Plant and Equipment Estimated Useful Lives [Table Text Block] Property Plantand Equipment Estimated Useful Lives Table [Text Block] Increase (Decrease) in Income Taxes Receivable Federal and state income tax payable / receivable Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Net cash used for investing activities Finance Lease, Weighted Average Remaining Lease Term Finance leases Title of 12(b) Security Title of 12(b) Security Schedule of Segment Reporting Information, by Segment [Table] Schedule Of Segment Reporting Information By Segment [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Level 3 fair value of pension plans' assets [Roll Forward] DeRidder Litigation DeRidder Litigation DeRidder and other litigation Derivative Instruments and Hedging Activities Disclosure [Text Block] Derivative Instruments and Hedging Activities Share Repurchase Program, Remaining Authorized, Amount Common stock repurchase authorization amount available Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Weighted Average Grant-Date Fair Value, Forfeitures Gain on Sale of Transportation Assets Gain on Sale of Transportation Assets Gain on sale of transportation assets. Money Market Funds [Member] Money Market Fund Related and Nonrelated Parties [Domain] Related Party Income Tax Disclosure [Text Block] Income Taxes Workforce Subject to Collective-Bargaining Arrangements [Member] Workforce Subject to Collective Bargaining Arrangements Describes the method of accounting for cutting rights and fiber farms and the capitalization of costs and associated balance sheet location of recorded amounts Cutting Rightsand Fiber Farms Policy [Text Block] Cutting Rights Variable Rate Senior Notes [Member] Variable Rate Senior Notes [Member] Variable Rate Senior Notes Interest Expense [Member] Interest Expense, Net Debt Refinancing Cost Debt Refinancing Cost Short-term marketable debt securities Short-Term Marketable Debt Securities Short-Term Marketable Debt Securities Variable Costs [Member] Variable Costs Variable costs Other Liabilities, Noncurrent Other long-term liabilities Other Liabilities, Noncurrent, Total Consolidated Entities [Axis] Consolidated Entities Restructuring Plan [Domain] Restructuring Plan Legal Entity [Axis] Legal Entity Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Changes in operating assets and liabilities, net of acquisitions: Summary of Property, Plant and Equipment (at cost) Property, Plant and Equipment [Table Text Block] Letters of Credit Outstanding, Amount Letters of Credit Outstanding Amount Fair value of plan assets at plan year end Defined Benefit Plan, Plan Assets, Amount Fair value of plan assets at plan year end Plan assets at fair value at beginning of period Defined Benefit Plan, Plan Assets, Amount, Total Defined Benefit Plan, Plan Assets, Amount Reportable segment - Paper. Paper [Member] Paper Income Tax Disclosure [Abstract] Fair Value, Recurring and Nonrecurring [Table] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Unrecognized Tax Benefits Gross reserve for unrecognized tax benefits, excluding interest and penalties Balance at December 31 Balance as of January 1 Unrecognized Tax Benefits, Beginning Balance Unrecognized Tax Benefits, Ending Balance Additional Paid-in Capital [Member] Additional Paid in Capital Bonds [Member] Share Repurchase Program, Authorized, Amount Stock repurchase program, authorized amount Statement of Income Location, Balance [Axis] Income Statement Location Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] Senior Notes [Member] Senior Notes Trading Symbol Trading Symbol Intangible Asset, Finite-Lived [Table] Schedule Of Finite Lived Intangible Assets [Table] Open Tax Year Open tax year Related Party Transaction [Table] Schedule Of Related Party Transactions By Related Party [Table] Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent, Total Nontaxable and nondeductible items Revision of Prior Period, Adjustment [Member] Adjustments Schedule of Finite-Lived Intangible Assets [Table Text Block] Components of Intangible Assets Property, Plant and Equipment, Planned Major Maintenance Activities, Policy [Policy Text Block] Planned Major Maintenance Costs Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Cash Flows from Financing Activities: Accounts Payable and Accrued Liabilities Disclosure [Text Block] Accrued Liabilities Share based compensation arrangement by share based payment award percentage of performance measurement based on return on invested capital. Share Based Compensation Arrangement By Share Based Payment Award Percentage Of Performance Measurement Based On Return On Invested Capital Percentage of TSR as performance measure Lessee, Operating Lease, Liability, to be Paid Total lease payments Lessee, Operating Lease, Liability, Undiscounted Excess Amount Less imputed interest Labor Labor Member Labor [Member] Goodwill and intangible asset impairment Goodwill and Intangible Asset Impairment Goodwill and Intangible Asset Impairment, Total Equity Components [Axis] Equity Components Deferred Tax Assets, Derivative Instruments Derivatives Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Change in Benefit Obligations [Roll Forward] Share based compensation arrangement by share based payment award award vesting period performance measurement based on return on invested capital. Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period Performance Measurement Based On Return On Invested Capital Vesting period of ROIC as performance measure Accrued Environmental Loss Contingencies, Current Environmental liabilities and asset retirement obligations Equity Component [Domain] Equity Component Goodwill and Intangible Assets Disclosure [Abstract] Business Combination, Recognized Asset Acquired and Liability Assumed [Table Text Block] Schedule of the Allocation of the Purchase Price to the Assets Acquired and the Liabilities Assumed Document Annual Report Document Annual Report Business Combination [Axis] Business Acquisition Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost, Rate of compensation increase Pension and post-retirement benefits expense, net of contributions Pension And Postretirement Benefits Contributions Expense Net The amount of pension and postretirement benefit costs recognized during the period, less the amount of contributions made by the entity to fund its plans. For defined benefit plans, pension and postretirement expense includes the following components: service cost, interest cost, expected return on plan assets, gain or loss on plan assets, prior service cost or credit, transition asset or obligation, and gain or loss due to settlements or curtailments. Machinery and Equipment [Member] Machinery and Equipment Customer [Axis] Customer Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Operating Lease Obligation Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Operating Lease Obligation Long-term operating lease obligations Revenue, Segment Benchmark [Member] Paper Segment Sales Revenue Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year Health care cost trend rate assumed for next year Maximum [Member] Maximum Statistical Measurement [Axis] Statistical Measurement Finite-Lived Intangible Assets, Accumulated Amortization Accumulated Amortization Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits Pension and postretirement benefits Common Stock, Value, Issued Common Stock, Value, Issued, Total Common Stock, Value, Issued, Beginning Balance Common Stock, Value, Issued, Ending Balance Common stock, par value $0.01 per share, 300.0 million shares authorized, 89.2 million and 89.8 million shares issued as of December 31, 2025 and December 31, 2024, respectively Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Finance Lease, Principal Payments Financing cash flows for finance leases Farm Credit Agreement Farm Credit Agreement [Member] Farm Credit Agreement (Member) Incremental out-of-pocket costs Incremental Out Of Pocket Costs Incremental out of pocket costs. Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Summary of Reclassifications Out of Accumulated Other Comprehensive Income (AOCI) Payments to Acquire Other Productive Assets Additions to other long-term assets Payments to Acquire Other Productive Assets, Total Defined benefit plan purchases plan assets. Defined Benefit Plan Purchases Plan Assets Purchases Equity, Including Portion Attributable to Noncontrolling Interest Ending Balance Beginning Balance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Total Noncash information on increase decrease in lease liabilities. Noncash Information On Increase Decrease In Lease Liabilities Supplemental non-cash information on changes in lease liabilities Impairment of marketable debt securities. Impairment Of Marketable Debt Securities Impairment of marketable debt securities Deferred Tax Assets, Operating Loss Carryforwards Net operating loss carryforwards Deferred Tax Assets, Operating Loss Carryforwards, Total Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block] Defined Benefit Plan, Amount Recognized in Net Periodic Benefit Cost (Credit) and Other Comprehensive (Income) Loss, before Tax Total recognized in net periodic benefit cost and other comprehensive income (pre-tax) Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Long-Lived Asset Impairment Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Domestic state and local income taxes, net of federal effect Amortization of Debt Issuance Costs Amortization of financing costs Schedule Of Income Taxes [Table] Schedule Of Income Taxes [Table] Schedule Of Income Taxes [Table] Represents amount of lease payments under long-term timberland cutting rights leases that are capitalized. Capitalized Payments Under Timber Cutting Rights Leases Long-term lease costs capitalization (Cutting rights) Entity Public Float Entity Public Float Interest Payable, Current Accrued interest Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class Payment, Tax Withholding, Share-Based Payment Arrangement Shares withheld to cover employee restricted stock taxes Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss Unrealized Losses Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total Effective Income Tax Rate Reconciliation, Cross-Border Tax Effect, Percent Effective Income Tax Rate Reconciliation, Cross-Border Tax Effect, Percent, Total Effect of cross-border tax laws Related Party Transaction [Line Items] Related Party Transaction [Line Items] Interest Expense, Lessee, Assets under Capital Lease Interest paid, finance lease obligations Revenue from Contract with Customer [Text Block] Revenue Entity Registrant Name Entity Registrant Name Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Interest accrued related to unrecognized tax benefits and penalties Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total Debt Disclosure [Text Block] Debt Deferred Tax Liabilities, Goodwill and Intangible Assets Goodwill and intangible assets Deferred Tax Liabilities, Goodwill and Intangible Assets, Total COVID nineteen. Covid Nineteen [Member] COVID-19 Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation Accumulated benefit obligation for plans with obligations in excess of plan assets Entity Voluntary Filers Entity Voluntary Filers Customer Concentration Risk [Member] Customer Concentration Risk [Member] Customer Concentration Risk Finite-Lived Intangible Asset, Expected Amortization, Year Two 2027 Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income Loss [Table] Deferred State and Local Income Tax Expense (Benefit) State and local International equity securities. International Equity Securities [Member] International Equity Securities Cybersecurity Risk Management Positions or Committees Responsible [Flag] Consolidated Entities [Domain] Consolidated Entities Finite-Lived Intangible Asset, Expected Amortization, Year Three 2028 Income Tax Expense (Benefit) Provision for income taxes Income tax benefit Total provision for income taxes Income before income tax expense Defined Benefit Plan, Plan Assets, Target Allocation, Percentage Defined Benefit Plan, Plan Assets, Target Allocation, Percentage Schedule of supplemental cash flow information related to leases. Schedule Of Supplemental Cash Flow Information Related To Leases Table [Text Block] Schedule of Supplemental Cash Flow Information Related to Leases Common Stock, Dividends, Per Share, Cash Paid Dividends paid per common share (in dollars per share) Payments to acquire assets Payments to Acquire Productive Assets Payments to Acquire Productive Assets, Total Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Common stock repurchases and retirements Common Stock Repurchase and Retirements Common stock repurchase and retirements Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Qualified Plan [Member] Qualified Plan Other Expense, Net Other Income and Other Expense Disclosure [Text Block] Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax Amortization of prior service cost (credit) Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax, Total Consolidation Items [Axis] Consolidation Items Supplemental Unemployment Benefits, Severance Benefits Severance, retention, and relocation Federal Income Tax Expense (Benefit), Continuing Operations Federal Income Tax Expense (Benefit), Continuing Operations, Total U.S. federal Additions to property, plant, and equipment Payments to Acquire Property, Plant, and Equipment Capital Expenditures Additions to property, plant, and equipment Payments to Acquire Property, Plant, and Equipment, Total Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Granted Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] Amounts Recognized on Consolidated Balance Sheets: Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Reclassification Adjustment, before Tax Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Reclassification Adjustment, before Tax, Total Actuarial net gain Assets Assets Total assets Carrying amount of LTP's assets Inventory, Policy [Policy Text Block] Inventory Valuation Property, Plant and Equipment [Table] Schedule Of Property Plant And Equipment [Table] U.S. state and local Income Tax Paid, State and Local, after Refund Received Income Tax Paid, State and Local, after Refund Received, Total Income Statement [Abstract] Finance Lease, Interest Payment on Liability Operating cash flows for finance leases Share-Based Payment Arrangement [Policy Text Block] Share-Based Compensation Defined Benefit Plan, Amortization of Gain (Loss) Amortization of actuarial gains / (losses) Actuarial gain Cash, Cash Equivalent, and Marketable Security [Text Block] Cash, Cash Equivalents, and Marketable Debt Securities Deferred Income Tax Expense (Benefit) Total deferred provision (benefit) for taxes Deferred income tax provision (benefit) Loss from catastrophes, after tax. Loss From Catastrophes After Tax Charges related to the impact of Hurricane Laura, after tax Carrying value as of the balance sheet date of obligations incurred and payable for real and property taxes, sales and use taxes, and franchise taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Accrual For Franchise Property Sales And Use Taxes Current Franchise, property, sales and use taxes 3 Year Term Loan, due September 2028 Three Year Term Loan Due September TwoT housand And Twenty Eight [Member] Three Year Term Loan Due September TwoT housand And Twenty Eight [Member] Lease, Cost [Abstract] Finance lease cost: Depreciation, Depletion, and Amortization [Policy Text Block] Depreciation and Useful Life Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Vested Schedule of Allocation of Plan Assets [Table Text Block] Schedule of Pension Plans' Assets Investment Policies and Strategies Business Combination, Integration-Related Cost, Expense Acquisition and integration-related costs Acquisition and integration-related costs Business Combination [Abstract] Restructuring, Settlement and Impairment Provisions Restructuring, Settlement and Impairment Provisions Restructuring, Settlement and Impairment Provisions, Total Jackson mill conversion-related activities Earnings Per Share, Diluted Diluted Diluted income per common share (in dollars per share) Earnings Per Share, Diluted, Total Three Point Four Percentage Senior Notes Due December Two Thousand And Twenty Seven [Member] 3.40% Senior Notes, Due December 2027 Three point four percentage senior notes due december two thousand and twenty seven. Schedule of Segment Reporting Information, by Segment [Table Text Block] Analysis of Operations by Reportable Segment Unrealized Gain Unrealized Gain On Securities1 Unrealized gain on securities 1. Operating Segments [Member] Operating Segments Land and Land Improvements [Member] Land and Land Improvements Finite-Lived Intangible Asset, Expected Amortization, Year Five 2030 Effective Income Tax Rate Reconciliation, Percent [Abstract] Percentage Title and Position [Domain] Title of Individual Repurchases of common stock under stock repurchase program. Repurchases Of Common Stock Under Stock Repurchase Program Repurchases of common stock under stock repurchase program Retirement Plan Tax Status [Axis] Retirement Plan Tax Status City Area Code City Area Code Defined Benefit Plan, Cash [Member] Defined Benefit Plan, Cash Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position Accrued asset (obligation) recognized at December 31 Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date Long-term equity incentive plan, termination date Auditor Name Auditor Name Finance Lease, Liability, Noncurrent Finance lease obligations Long-term portion of finance lease obligations Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax Total Quarterly Financial Information [Table Text Block] Summary of Quarterly Financial Data Debt instrument, face amount Debt Instrument, Face Amount Debt, face amount Business Combination [Line Items] Schedule Of Quarterly Financial Data [Table] Schedule Of Quarterly Financial Data [Table] Schedule Of Quarterly Financial Data [Table] Defined Benefit Plan [Table] Schedule Of Defined Benefit Plans Disclosures [Table] Other Intangible Assets [Member] Other Intangible Assets Counterparty Name [Domain] Recorded Unconditional Purchase Obligation, to be Paid, after Year Three Recorded Unconditional Purchase Obligation, to be Paid, after Year Three Thereafter Represents term of senior credit facilities and notes. Term Of Senior Credit Facilities And Notes Term of senior credit facilities and notes, in years Variable Lease, Cost Variable lease cost Defined Benefit Plan, Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate Year that the rate reaches the ultimate trend rate Domestic Equity Securities Domestic Equity Securities (Member) Domestic Equity Securities (Member) Operating Lease, Weighted Average Remaining Lease Term Operating leases Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Stock Issued During Period, Shares, Restricted Stock Award, Gross Stock Issued During Period, Shares, Restricted Stock Award, Gross Lease, Cost Total lease cost Cash and Cash Equivalents, Policy [Policy Text Block] Cash and Cash Equivalents Accumulated losses, excess percentage threshold required on projected benefit obligation. Accumulated Losses Excess Percentage Threshold Required On Projected Benefit Obligation Accumulated losses, excess percentage threshold required on projected benefit obligation Property, Plant and Equipment, Net Property, plant and equipment, net Property, plant and equipment, net Property, Plant and Equipment, Net, Beginning Balance Property, Plant and Equipment, Net, Ending Balance Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Finance leases Finance leases Defined Benefit Plan, Expected Future Benefit Payment, Year Three 2028 Deferred Foreign Income Tax Expense (Benefit) Foreign Impairment of Intangible Assets, Finite-Lived Intangible asset impairment charge Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation Cash and cash equivalents, end of year Cash and cash equivalents, beginning of year Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations, Total Operating Income (Loss) Operating Income (Loss) Income from operations Income (loss) from operations Old Credit Agreement [Member] Old Credit Agreement [Member] Old Credit Agreement [Member] Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost, Discount rate Retained Earnings [Member] Retained Earnings Intangible assets Intangible Assets, Current Intangible Assets, Current, Total Intersegment [Member] Intersegment. Intersegment sales Share-Based Payment Arrangement, Noncash Expense Share-based compensation expense Share-based Payment Arrangement, Noncash Expense, Total Short-Term Debt, Average Outstanding Amount Schedule of commitments and contingencies. Schedule Of Commitments And Contingencies [Line Items] Schedule Of Commitments And Contingencies [Line Items] Liabilities, Noncurrent Total long-term liabilities Unrecorded Unconditional Purchase Obligation, to be Paid, Year Four 2029 Fair Value of Marketable Debt Securities in a Loss Position Less than 12 Months Fair Value of Marketable Debt Securities in a Loss Position Less than 12 Months Unrecorded Unconditional Purchase Obligation Total Statement of Financial Position Location, Activity, Capitalization [Domain] Payment for Pension and Other Postretirement Benefits [Abstract] Pension Contributions [Abstract] Cash, Cash Equivalents, and Short-Term Investments [Abstract] Operating Lease, Weighted Average Discount Rate, Percent Operating leases Operating Lease, Liability, Noncurrent Long-term portion of operating lease obligations Operating lease obligations Fair Value, Inputs, Level 1 [Member] Level 1 Quoted prices in active markets for identical assets (Level 1) Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Net cash provided by (used for) financing activities Schedule of supplemental balance sheet information related to finance leases. Schedule Of Supplemental Balance Sheet Information Related To Finance Leases Table [Text Block] Schedule of Supplemental Balance Sheet Information Related to Finance Leases Lease, Cost [Table Text Block] Components of Lease Expense Asset Acquisition [Abstract] Auditor Location Auditor Location Deferred Income Tax Liabilities, Net Deferred income taxes Deferred Income Tax Liabilities, Net, Total Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax Amortization of actuarial loss (gain) Derivative Contract [Domain] Derivative Contract Goodwill [Table] Schedule Of Goodwill [Table] Business Combination, Recognized Asset Acquired, Receivable, Current Accounts receivable Annual principal maturities for debt Repayments of Long-Term Debt [Abstract] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Corporate Debt Securities [Member] Corporate Bonds (Corporate and Government Bonds) Corporate Debt Securities Income Tax Authority Income Tax Jurisdiction [Domain] Entity Interactive Data Current Entity Interactive Data Current Defined Benefit Plan, Plan Assets, Category [Axis] Defined Benefit Plan, Plan Assets, Category Deferred Tax Liabilities, Gross [Abstract] Deferred tax liabilities: Statement of Income Location, Balance [Domain] Income Statement Location Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Cash Flows from Operating Activities: Furniture and Fixtures [Member] Furniture and Fixtures Asset Acquisition [Line Items] Asset Acquisition [Line Items] Hurricane Laura Hurricane laura. Hurricane Laura [Member] Treasury Lock [Member] Treasury Lock Unrealized Loss on Treasury Locks, Net Unfunded portion of commitment to invest in private equity securities. Unfunded Portion Of Investment Commitment Unfunded portion of investment commitment Cash Equivalents, at Carrying Value Cash equivalents Cash Equivalents, at Carrying Value, Total Common Stock, Dividends, Per Share, Declared Dividends declared per common share Accrued medical insurance and workers compensation current. Accrued Medical Insurance And Workers Compensation Current Medical insurance and workers’ compensation Cumulative Effect, Period of Adoption [Domain] Cumulative Effect, Period of Adoption Share-Based Payment Arrangement, Expense, Tax Benefit Income tax benefit Entity Tax Identification Number Entity Tax Identification Number Long-Term Debt, Type [Axis] Long-term Debt, Type Other Inventory, Supplies, Gross Supplies and materials Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions Number of Marketable Debt Securities in a Loss Position Less than 12 Months Proceeds from maturities of available-for-sale debt securities Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale Income Tax Authority, Name [Domain] Income Tax Authority, Name Other Interest Income, Other Other Local Phone Number Local Phone Number Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Net periodic benefit cost Short-Term Lease, Cost Short-term lease cost Auditor Opinion [Text Block] Schedule of Net Funded Status [Table Text Block] Schedule of Obligations and Funded Status of Defined Benefit Pension and Postretirement Benefit Plans Finance Lease, Liability, to be Paid, Year Two 2027 Payments of Financing Costs Financing costs paid Payments of Financing Costs, Total Trademarks [Member] Trademarks Noncash information on increase decrease in right of use assets. Noncash Information On Increase Decrease In Right Of Use Assets Supplemental non-cash information on changes in right-of-use assets Schedule of weighted average remaining lease term and weighted average discount rates for leases. Schedule Of Weighted Average Remaining Lease Term And Weighted Average Discount Rates For Leases Table [Text Block] Schedule of Weighted Average Remaining Lease Term and Weighted Average Discount Rates for Leases Denominator: Weighted Average Number of Shares Outstanding, Basic [Abstract] Accounting Policies [Abstract] Previously Reported [Member] Allocation Disaggregation of Revenue [Line Items] Disaggregation Of Revenue [Line Items] Revenue Revenue from Contract with Customer, Excluding Assessed Tax Revenue from Contract with Customer, Excluding Assessed Tax, Total Net sales 5.20% Senior Notes, Due August 2035 Five Point Two Zero Senior Notes Due August Two Thousand And Thirty Five [Member] Five Point Two Zero Senior Notes Due August Two Thousand And Thirty Five [Member] Segment Reporting, Revenue from External Customer, Product and Service [Table] Schedule Of Entity Wide Information Revenue From External Customers By Products And Services [Table] Facility Closing [Member] Corrugated Products Facility Closure Lessee, Operating Lease, Liability, to be Paid, Year Four 2029 Two Thousand And Ten Interest Rate Protection Agreement Two Thousand And Ten Interest Rate Protection Agreement [Member] 2010 Interest Rate Protection Agreement Cash and Cash Equivalents [Member] Cash and Cash Equivalents Production Capacity Production Capacity Production Capacity Commercial Paper [Member] Commercial Paper Packaging Corporation of America Packaging Corporation of America [Member] Packaging Corporation Of America [Member] Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant Number of shares available for future issuance under share-based plan Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Remaining weighted-average recognition period Non-cash impairment charges Impairment Charge on Reclassified Assets Other Long Term Guarantee Liability Other Long Term Guarantee Liability Other long term guarantee liability Entity Emerging Growth Company Entity Emerging Growth Company Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net, Total Net assets acquired