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Total Shareholder Return Amount Total Shareholder Return Amount Tax (expense) benefit, cash flow hedges, net Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax Litigation Case [Domain] Litigation Case [Domain] Adjustments to reconcile net income to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Share-Based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] Cash (used in) provided by financing activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Property, plant and equipment, net of accumulated depreciation of $646.6 and $465.4 Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Net sales Intersegment revenues: Revenue from Contract with Customer, Excluding Assessed Tax Interest cost Defined Benefit Plan, Interest Cost Financial Instruments Financial Instruments [Domain] Financial assets: Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Inventories Inventory Disclosure [Text Block] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Underlying Securities Award Underlying Securities Amount Fair Value Estimate of Fair Value Measurement [Member] Issuance of common stock Stock Issued During Period, Value, New Issues Number of claims Loss Contingency, Claims, Number Loss Contingency, Claims, Number Fair Values Derivatives Balance Sheet Location By Derivative Contract Type By Hedging Designation [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] May 2026 Grant May Two Thousand Twenty Six Grant [Member] May Two Thousand Twenty Six Grant Other investing activities Payment for (Proceeds from) Other Investing Activity Inventories Increase (Decrease) in Inventories Number of potential responsible parties Number Of Potentially Responsible Parties Number of potentially responsible parties. Schedule Of Segment Reporting Information By Segment [Table] Segment Reporting [Table] Stock Options Additional Disclosures Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract] Performance Shares, Granted 2025 And Prior Performance Shares, Granted 2025 And Prior [Member] Performance Shares, Granted 2025 And Prior Other current assets Other Assets, Current Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Operating (loss) profit Operating Income (Loss) Current Fiscal Year End Date Current Fiscal Year End Date Railroad and Utility Products and Services Railroad And Utility Products And Services [Member] Railroad and utility products and services. Non cash gain on liquidation of business Gain (Loss) on Disposition of Business Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Derivative [Line Items] Derivative [Line Items] Impairment and depreciation in impairment and restructuring Impairment and Depreciation in Impairment and Restructuring Depreciation in impairment and restructuring. Cumulative restructuring charges, expected Restructuring and Related Cost, Expected Cost Restructuring Reserve [Roll Forward] Restructuring Reserve [Roll Forward] Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Common Stock dividends (in dollars per share) Quarterly dividend declared per common share (in dollars per share) Common Stock, Dividends, Per Share, Declared Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Service cost Defined Benefit Plan, Service Cost Amortization of cloud-based software implementation costs Capitalized Cost, Software to be Sold, Leased, or Marketed, Amortization Expense Summary of Status and Activity of Stock Options Share-Based Payment Arrangement, Option, Activity [Table Text Block] Weighted Average Exercise Price per Option Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Common Stock, shares issued (in shares) Common Stock, Shares, Issued Measure: Measure [Axis] Finished goods Inventory, Finished Goods, Gross Non-cash interest expense Amortization of Debt Discount (Premium) Currency translation Accrual for Environmental Loss Contingencies, Foreign Currency Translation Gain (Loss) Railroad treated products Railroad Treated Products [Member] Railroad treated products. Treasury stock, shares (in shares) Treasury Stock, balance at beginning of period (in shares) Treasury Stock, balance at end of period (in shares) Treasury Stock, Common, Shares Foreign Currency Forward Contracts Foreign currency forward contracts Forward Contracts [Member] Equity Components Equity Components [Axis] Accounts receivable Increase (Decrease) in Accounts Receivable Product and Service Product and Service [Domain] Entity Interactive Data Current Entity Interactive Data Current Deferred tax liabilities Deferred Income Tax Liabilities, Net Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] (Gain) loss from contracts where hedge accounting was not elected Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net Defined contribution plan expense Defined Contribution Plan, Cost Entity Small Business Entity Small Business Termination Date Trading Arrangement Termination Date Effective Income Tax Rate Reconciliation [Table] Effective Income Tax Rate Reconciliation [Table] Federal income tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Pension adjustments, net of tax of $0.0, $0.0, $0.0 and $8.3 Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Cash expenditures Accrual for Environmental Loss Contingencies, Payments Summary of Details of Plant Closures and Restructuring Liabilities Summary of Details of Plant Closures and Restructuring Liabilities [Table Text Block] Summary of details of plant closures and restructuring liabilities. Stock options, term in years Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period Other assets Other Assets, Noncurrent Document Type Document Type Accrued liabilities Accrued Liabilities, Current Fair Value as of Grant Date Award Grant Date Fair Value Loss (gain) on sale of assets (Loss) gain on sale of assets Gain (Loss) on Disposition of Assets Aggregate Intrinsic Value, Exercisable Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Arrangement Duration Trading Arrangement Duration Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Number of miles between facility taking on production from idle facility Number Of Miles Between Facility Taking On Production From Idle Facility Number Of Miles Between Facility Taking On Production From Idle Facility Local Phone Number Local Phone Number Work in process Inventory, Work in Process, Gross Consolidation Items Consolidation Items [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Basis of Presentation and New Accounting Pronouncements Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] (Loss) income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Percentage of target award earned by participants Share Based Compensation Arrangement By Share Based Payment Award Percentage Of Target Award Participants Earn Share based compensation arrangement by share based payment award percentage of target award the participants earn. Commitments and contingent liabilities (Note 12) Commitments and Contingencies Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Pension settlement and expense Defined Benefit Plan, Gain (Loss) Due To Settlement And Expense Defined Benefit Plan, Gain (Loss) Due To Settlement And Expense Executive Category: Executive Category [Axis] Percentage of target award from cumulative free cash flow Share Based Compensation Arrangement By Share Based Payment Award, Cumulative Free Cash Flow, Percentage Of Target Award Share Based Compensation Arrangement By Share Based Payment Award, Cumulative Free Cash Flow, Percentage Of Target Award Adjusted EBITDA: Adjustments To Earnings Before Interest Taxes Depreciation And Amortization [Abstract] Adjustments to earnings before interest, tax, depreciation and amortization. Stock-based awards, vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Counterparty Name Counterparty Name [Axis] Expired (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period Australia AUSTRALIA Weighted Average Remaining Contractual Term, Exercisable Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted-Average Remaining Contractual Term Inventories, net Inventories, net Inventory, Net All Award Types Award Type [Domain] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Amounts reclassified from accumulated other comprehensive income to net income related to derivative financial instruments, net of tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax Shares repurchased (in shares) Treasury Stock, Shares, Acquired Number of plaintiffs filing an appeal Loss Contingency, Number Of Plaintiffs Filing An Appeal Loss Contingency, Number Of Plaintiffs Filing An Appeal PEO Name PEO Name Geographical Geographical [Axis] Accrued liabilities Increase (Decrease) in Accrued Liabilities Financial liabilities: Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Utility poles Utility Poles [Member] Utility poles. Debt instrument, floor interest rate Debt Instrument Floor Interest Rate Debt instrument floor interest rate. Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Less related income tax benefit Share-Based Payment Arrangement, Expense, Tax Benefit Purchases Treasury Stock, Value, Acquired, Cost Method Cash paid Payments for Restructuring Exercised (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Cash and cash equivalents Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Insurance proceeds Proceeds from Sale of Insurance Investments Accounts payable Increase (Decrease) in Accounts Payable Derivative contracts Derivative Fair Value Of Derivative Current Assets Derivative fair value of derivative current assets. Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Portland Harbor, Trustee Claims Portland Harbor, Trustee Claims [Member] Portland Harbor, Trustee Claims Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Comprehensive (loss) income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Debt Instrument Debt Instrument [Axis] Stock-based compensation Share-Based Payment Arrangement, Noncash Expense Undiscounted cost of selected remedy estimation Undiscounted Cost Of Selected Remedy Estimation Undiscounted cost of selected remedy estimation. Summary of Components of Inventories Schedule of Inventory, Current [Table Text Block] Long-Term Debt, Type Long-Term Debt, Type [Domain] Basic (in dollars per share) Earnings Per Share, Basic Raw materials Inventory, Raw Materials, Gross Repurchases of Common Stock Payments for Repurchase of Common Stock Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Summary of Unrealized (Gain) loss from Contract Where Hedge Accounting Was Not Elected Derivative Instruments, Gain (Loss) [Table Text Block] Long-term debt Long-Term Debt, Excluding Current Maturities Award Type Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Accounts receivable, net of allowance of $4.6 and $7.0 Accounts Receivable, after Allowance for Credit Loss, Current Retained earnings Retained Earnings (Accumulated Deficit) Commodity Price Hedging Commodity Contract [Member] Restructuring and Related Activities [Abstract] Product and Service Product and Service [Axis] Costs of participating in PRP group Costs Of Participating In Potentially Responsible Parties Group Costs of participating in potentially responsible parties group. Performance share adjustment (in shares) Share Based Compensation Arrangement By Performance Share Adjustment Share Based Compensation Arrangement By Performance Share Adjustment Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Term Loan B Term Loan B [Member] Term loan B. Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Net proceeds from secured debt, before debt financing costs Proceeds from Issuance of Secured Debt Debt instrument, unused borrowing capacity Debt Instrument, Unused Borrowing Capacity, Amount Common Stock: Common Stock [Member] Railroad infrastructure products and services Railroad Infrastructure Products and Services [Member] Railroad infrastructure products and services. Expected volatility Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate Fair Value Measurement Fair Value Measurement [Domain] Nondeductible expenses Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent Severance and employee benefits Employee Severance [Member] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Cover [Abstract] Impairment Impairment [Member] Impairment Sale of business and divestitures Payments For Divestiture Of Businesses Payments for divestiture of businesses. Derivative Contract Derivative Contract [Domain] Depreciation and asset disposal costs Depreciation And Asset Disposal Costs [Member] Depreciation and asset disposal costs. Equity Awards Adjustments Equity Awards Adjustments [Member] Vesting performance stock units if minimum performance criteria are not achieved (in shares) Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options To Be Vested If Performance Criteria Not Achieved Share based compensation arrangement by share based payment award equity instruments other than options to be vested if performance criteria not achieved. Return of capital to noncontrolling interests Return Of Capital To Noncontrolling Interests Return Of Capital To Noncontrolling Interests Total liabilities and equity Liabilities and Equity 6.19 Percent Credit Facility Six Point One Nine Percent Credit Facility [Member] Six point two nine percent credit facility. Employee Stock Option Share-Based Payment Arrangement, Option [Member] Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Short-term, asset retirement obligation Asset Retirement Obligation, Current Noncontrolling interests Equity, Attributable to Noncontrolling Interest Segments Segments [Axis] Change in other liabilities Increase (Decrease) in Other Operating Liabilities Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Inventory Disclosure [Abstract] Inventory Disclosure [Abstract] Tabular List, Table Tabular List [Table Text Block] Summary of Stock-based Compensation Expense Recognized Share-Based Payment Arrangement, Cost by Plan [Table Text Block] Name Awards Close in Time to MNPI Disclosures, Individual Name Equity Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Aggregate Intrinsic Value, Outstanding Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value Carbon Materials and Chemicals Carbon Materials And Chemicals [Member] Carbon materials and chemicals. Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Senior Convertible Preferred Stock, shares authorized (in shares) Preferred Stock, Shares Authorized Derivatives Fair Value [Line Items] Derivatives, Fair Value [Line Items] Senior Convertible Preferred Stock, $0.01 par value per share; 10,000,000 shares authorized; no shares issued Preferred Stock, Value, Issued Number of plant sites Number Of Acquired Plant Sites With Recorded Environmental Remediation Liability The number of acquired plant sites where environmental remediation liabilities have been recorded for soil and groundwater contamination which occurred prior to acquisition. Adjustment to Compensation: Adjustment to Compensation [Axis] Hedging Designation Hedging Designation [Domain] Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Portland Harbor and Newark Bay CERCLA sites Environmental Remedial Site Two [Member] Environmental remedial site two. Portland Harbor Portland Harbor [Member] Portland Harbor Performance Chemicals Performance Chemicals [Member] Performance chemicals. Hedging Designation Hedging Designation [Axis] Net present value of selected remedy estimation Net Present Value Of Selected Remedy Estimation Net present value of selected remedy estimation. Credit Facility Credit Facility [Axis] Restructuring Restructuring and Related Activities Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Wood preservative products and other Wood Preservative Products And Other [Member] Wood preservative products and other. Name Measure Name Income Taxes Income Tax Disclosure [Text Block] Accounts payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Other - net Other Noncash Income (Expense) Insurance proceeds Unusual or Infrequent Item, or Both, Insurance Proceeds Debt Instrument [Line Items] Debt Instrument [Line Items] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Additional paid-in capital: Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Name Trading Arrangement, Individual Name Retirement Plan Sponsor Location [Axis] Retirement Plan Sponsor Location [Axis] Expense Accrual for Environmental Loss Contingencies, Charges to Expense for New Losses Number of claims settled Loss Contingency, Claims Settled, Number Company Selected Measure Amount Company Selected Measure Amount Not Designated as Hedging Instrument Not designated as hedges Not Designated as Hedging Instrument [Member] Retirement Plan Sponsor Location [Domain] Retirement Plan Sponsor Location [Domain] Total Inventory, Gross Issued for employee stock plans (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Net (loss) income Net (loss) income Net (loss) income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Unrecognized tax benefits that would impact effective tax rate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Right-of-use assets obtained in exchange for new operating lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Vested (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Income tax (benefit) provision Income tax benefit (provision) Income Tax Expense (Benefit) Estimated annual effective income tax rate Estimated Annual Effective Income Tax Rate Estimated annual effective income tax rate. Cost of sales Cost of Product and Service Sold Award Timing Method Award Timing Method [Text Block] Net increase (decrease) in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Sites listed on National Priorities List Number Of Sites Listed On National Priorities List Number of sites listed on national priorities list. Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Cloud-based software implementation costs, net of amortization Payments For Computer Software Implementation, Net Payments For Computer Software Implementation, Net Units Outstanding (in Pounds) Derivative Liability, Notional Amount Amortization of net loss Defined Benefit Plan, Amortization of Gain (Loss) Net (loss) income Net Income (Loss) Attributable to Parent Long-Term Debt, Type Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Balance Sheet Location Location, Statement of Financial Position, Balance [Axis] Statement [Table] Statement [Table] Environmental Remediation Site Environmental Remediation Site [Domain] Restatement Determination Date: Restatement Determination Date [Axis] Exercisable (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price LIFO benefit Inventory, LIFO Reserve, Effect on Income, Net Plant cleaning, waste disposal and demolition costs Plant Cleaning, Waste Disposal And Demolition Costs [Member] Plant Cleaning, Waste Disposal And Demolition Costs Amendment Number One to Credit Facility Amendment Number One to Credit Facility [Member] Amendment Number One to Credit Facility Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract]