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[Table] Market Pulp Market Pulp [Member] Market Pulp Schedule of Segment Reporting Schedule of Segment Reporting Information, by Segment [Table Text Block] Pension Plan Pension Plan [Member] Stock-based compensation Share-Based Payment Arrangement, Noncash Expense Debt Covenant Terms [Axis] Debt Covenant Terms [Axis] Debt Covenant Terms Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Total Equity Beginning balance Ending balance Total Accumulated Other Comprehensive Income (Loss) at End of Period Equity, Attributable to Parent Net gains (losses) arising during the period, tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax Other comprehensive income (loss) before reclassifications OCI, before Reclassifications, Net of Tax, Attributable to 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Computation of Earnings Per Share [Line Items] Line of Credit Facility, Interest Rate at Period End Line of Credit Facility, Interest Rate at Period End Defined Benefit Pension and Postretirement Adjustments Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] LIABILITIES AND EQUITY Liabilities and Equity [Abstract] Cover [Abstract] Amounts reclassified from accumulated other comprehensive income (loss) Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent Maximum Maximum [Member] Accounting Policies [Abstract] Debt Instrument [Line Items] Debt Instrument [Line Items] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Common Stock Held In Treasury, At Cost Treasury Stock, Common [Member] Term Loan F Notes Due 2027 Term Loan F Notes Due 2027 [Member] Term Loan F Notes Due 2027 Retirement Benefits [Abstract] Change in cumulative foreign currency translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Interest Rate Fair Value Hedge Liability at Fair Value Interest Rate Fair Value Hedge Liability at Fair Value Total leased assets Lease, Right-Of-Use Asset Lease, Right-Of-Use Asset Liabilities Liabilities [Abstract] INCOME (LOSS) BEFORE INCOME TAXES Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Environmental Remediation Site [Domain] Environmental Remediation Site [Domain] Other Liabilities Other Liabilities, Noncurrent Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Site Contingency [Table] Site Contingency [Table] Operating Segments Operating Segments [Member] Remaining lease term Lessee, Operating Lease, Remaining Lease Term Net gains (losses) arising during the period (less tax of $2 and $3) Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax Less: current portion Long-Term Debt, Current Maturities Statement of Cash Flows [Abstract] Financing Leases Other Long-Term Debt [Member] Other Long-Term Debt Change in cumulative foreign currency translation adjustment Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax [Abstract] Comprehensive income (loss) Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Expected timing for resolution in open market, term Open Tax Matters, Expected Timing for Resolution in Open Market, Term Open Tax Matters, Expected Timing for Resolution in Open Market, Term Interest and Legal Fees Interest, Legal Fees and Penalties [Member] Interest, Legal Fees and Penalties Schedule of Stock Based Compensation Cost Recognized Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Secured Debt Secured Debt [Member] Operating Operating Lease, Liability, Current Change In Equity Note [Line Items] Class of Stock [Line Items] Deferred Income Taxes Deferred Income Tax Liabilities, Net Document Fiscal Period Focus Document Fiscal Period Focus Other Significant Noncash Transaction [Axis] Other Significant Noncash Transaction [Axis] Litigation Case [Domain] Litigation Case [Domain] Hedging Relationship [Domain] Hedging Relationship [Domain] Term Loan A Due 2028 [Member] Term Loan A Due 2028 [Member] Term Loan A Due 2028 Change in Cumulative Foreign Currency Translation Adjustments Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Legal Entity [Axis] Legal Entity [Axis] TOTAL ASSETS Assets Assets Trading Symbol Trading Symbol Incentive Plan Incentive Plan [Member] Incentive Plan Antidilutive Due to Net Loss Antidilutive Due to Net Loss [Member] 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Information [Table] Document Information [Table] External net sales by major products Disaggregation of Revenue [Table Text Block] Fair value of interest rate swaps Interest Rate Fair Value Hedge Asset at Fair Value Derivative Instruments and Hedging Activities Disclosure [Abstract] Retained Earnings Retained Earnings [Member] Mogi Guacu Mogi Guacu [Member] Mogi Guacu Debt instrument, effective interest rate Debt Instrument, Interest Rate, Effective Percentage Entity Address, Postal Zip Code Entity Address, Postal Zip Code Share-Based Payment Arrangement [Abstract] Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation, Beginning Balance Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation, Ending Balance Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement [Abstract] Income tax provision (benefit) Income Tax Expense (Benefit) Debt instrument, basis 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Instrument, Patronage Distributions, Cash Rebate, Percentage Debt Instrument, Patronage Distributions, Cash Rebate, Percentage Taxes other than payroll and income taxes Taxes, Miscellaneous Equity [Abstract] Other Significant Noncash Transaction, Name [Domain] Other Significant Noncash Transaction, Name [Domain] FINANCIAL INFORMATION BY BUSINESS SEGMENT AND GEOGRAPHIC AREA Segment Reporting Disclosure [Text Block] Schedule of Goodwill [Table] Goodwill [Table] Notes payable and current maturities of long-term debt Long-Term Debt and Lease Obligation, Current Long-term debt Debt and Lease Obligation Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Cost of products sold and other Cost of products sold and other Cost of products sold and other OTHER COMPREHENSIVE INCOME Comprehensive Income (Loss) Note [Text Block] Debt and Derivatives Disclosure Debt and Derivatives Disclosure [Text Block] Debt and Derivatives Disclosure 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equity Schedule of Stockholders Equity [Table Text Block] Revolving Credit Facility Revolving Credit Facility [Member] Defined Benefit Plan [Table] Defined Benefit Plan [Table] Total Interest Expense (Income), Including Capitalized Interest Costs, Net Interest Expense (Income), Including Capitalized Interest Costs, Net Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Segments [Axis] Segments [Axis] Other Other Inventory, Net of Reserves Entity Filer Category Entity Filer Category Local Phone Number Local Phone Number Class of Stock [Domain] Class of Stock [Domain] Subsequent Event Type [Axis] Subsequent Event Type [Axis] INCENTIVE PLANS Share-Based Payment Arrangement [Text Block] ASSETS Assets [Abstract] Credit Facility [Axis] Credit Facility [Axis] Balance Sheet Location [Axis] Statement of Financial Position Location, Balance [Axis] Debt Instrument [Axis] Debt Instrument [Axis] PENSION AND POSTRETIREMENT BENEFIT PLANS Retirement Benefits [Text Block] Credit Facility [Domain] Credit Facility [Domain] Entity Address, Address Line One Entity Address, Address Line One Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Debt Instrument, interest rate, stated percentage Debt Instrument, Interest Rate, Stated Percentage Allowance for expected credit losses Accounts Receivable, Allowance for Credit Loss, Current Operating Operating Lease, Liability, Noncurrent Location, Statement of Financial Position, Balance [Axis] Location, Statement of Financial Position, Balance [Axis] Location, Statement of Financial Position, Balance Debt instrument, patronage distributions, percentage Debt Instrument, Patronage Distributions, Percentage Debt Instrument, Patronage Distributions, Percentage Other Liabilities Other Liabilities [Member] Reclassification adjustments for (gains) losses included in net earnings, tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain 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Goods, Net of Reserves Common stock $1.00 par value, 200.0 shares authorized, 46.0 shares and 45.6 shares issued and 39.7 shares and 39.4 shares outstanding at March 31, 2026 and December 31, 2025, respectively Common Stock, Value, Issued Finance lease assets Finance Lease, Right-of-Use Asset, after Accumulated Amortization Goodwill [Roll Forward] Goodwill [Roll Forward] Short-term Investments Short-Term Investments COMMITMENTS AND CONTINGENT LIABILITIES Commitments and Contingencies Disclosure [Text Block] Weighted average common shares outstanding - assuming dilution Weighted Average Number of Shares Outstanding, Diluted Commitments and Contingent Liabilities (Note 11) Commitments and Contingencies Interest and penalties Interest and penalties [Member] Interest and penalties Entity Small Business Entity Small Business Income Tax Disclosure [Abstract] Document Transition Report Document Transition Report Term Loan F-2 - due 2031 (a) Term Loan F-2 Due 2031 [Member] Term Loan F-2 Due 2031 Equity Component [Domain] Equity Component [Domain] Document Period End Date Document Period End Date INCOME TAXES Income Tax Disclosure [Text Block] SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION Supplemental Balance Sheet Disclosures [Text Block] Revenue from Contract with Customer [Abstract] Hedging Designation [Axis] Hedging Designation [Axis] Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Document Type Document Type EARNINGS PER SHARE Earnings Per Share [Text Block] Paid-in capital Additional Paid in Capital Notes and other Accounts and Other Receivables, Net, Current Product and Service [Axis] Product and Service [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Income Tax Examination, Available Liquidity Required to Eliminate Limits on Maximum Annual Restricted Payments Income Tax Examination, Available Liquidity Required to Eliminate Limits on Maximum Annual Restricted Payments Income Tax Examination, Available Liquidity Required to Eliminate Limits on Maximum Annual Restricted Payments NET SALES Revenue from Contract with Customer, Excluding Assessed Tax Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Total Current Assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Operating supplies Inventory, Supplies, Net of Reserves Loss Contingency Accrual Loss Contingency Accrual Schedule of Supplemental Balance Sheet Information Related To Leases Assets And Liabilities, Lessee [Table Text Block] Assets And Liabilities, Lessee Debt Instrument, Consolidated Total, Maximum Leverage Ratio Debt Instrument, Consolidated Total, Maximum Leverage Ratio Debt Instrument, Consolidated Total, Maximum Leverage Ratio Derivative, fixed interest rate Derivative, Fixed Interest Rate Currency translation and other Goodwill, Foreign Currency Translation, Gain (Loss) Current 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