Total revenues, net of other expenses Total Revenues Net Of Other Expenses Total sales, net of returns, allowances and discounts, plus other non-operating income and expenses. 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Includes income/loss from ongoing operations; plant shutdowns, asset impairments, restructurings and other non-recurring charges; and goodwill impairment charges. Nov-22 Nov-22 [Member] Nov-22 Aluminum Extrusions [Member] Aluminum Extrusions [Member] Aluminum Extrusions Member. Liability, Defined Benefit Plan, Current Liability, Defined Benefit Plan, Current Other assets Other Assets, Noncurrent Credit Spread Over London Interbank Offered Rate Basis Points Credit Spread Over Secured Overnight Financing Rate Basis Points Credit spread over SOFR basis points. Segments [Axis] Segments [Axis] Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Effective income tax rate reconciliation social contribution on income Effective income tax rate reconciliation social contribution on income Effective income tax rate reconciliation social contribution on income. Retirement Benefits [Abstract] Retirement Benefits [Abstract] Increase (decrease) in cash & cash equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Entity File Number Entity File Number Apr-23 Apr-23 [Member] Apr-23 Schedule of Other Nonoperating Income (Expense) [Table Text Block] Schedule of Other Nonoperating Income (Expense) [Table Text Block] Divestitures and Assets Held for Sale Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] General Corporate General Corporate [Member] General Corporate [Member] Aluminum Futures Contracts Aluminum Futures Contracts [Member] Aluminum futures contracts. Amortization of identifiable intangibles Amortization of Intangible Assets Payments of Financing Costs Payments of Financing Costs Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Schedule of Inventory, Current Schedule of Inventory, Current [Table Text Block] Tredegar common stock purchased by trust for savings restoration plan Tredegar Common Stock Purchased by Trust for Savings Restoration Plan Tredegar Common Stock Purchased By Trust For Savings Restoration Plan Cash Flow Hedging Cash Flow Hedging [Member] Schedule Of Identifiable Assets By Segment Schedule Of Identifiable Assets By Segment [Table Text Block] Schedule of identifiable assets by segment. Aug-22 Aug-22 [Member] Aug-22 Deferred income taxes Increase Decrease In Net Deferred Taxes Increase decrease in net deferred taxes. Local Phone Number Local Phone Number Credit Facility [Domain] Credit Facility [Domain] Assets Assets [Abstract] Schedule of Investments [Line Items] Schedule of Investments [Line Items] Derivative Financial Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Automotive [Member] Automotive [Member] Automotive [Member] [Member] Basis Of Presentation [Abstract] Basis Of Presentation [Abstract] Basis Of Presentation [Abstract] Derivative Assets (Liabilities), at Fair Value, Net Derivative Assets (Liabilities), at Fair Value, Net Retained Earnings Retained Earnings [Member] Prepaid expenses and other Increase (Decrease) in Prepaid Expense and Other Assets Amortization of prior service costs, (gains) losses and net transition asset Amortization Of Prior Service Costs And Net Gains Loss Amortization Of Prior Service Costs And Net Gains Loss Discontinued Operation, Tax Effect of Discontinued Operation Discontinued Operation, Tax Effect of Discontinued Operation Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Accrued pension and post-retirement benefits Pension and Other Postretirement Benefits Cost (Reversal of Cost) Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Brazil BRAZIL Earnings Per Share, Basic Earnings Per Share, Basic Accounts and Other Receivables Financing Receivables [Text Block] Personal Care Materials Overwrap Packaging [Member] Personal Care Materials [Member] Investment Income, Dividend Investment Income, Dividend Investments and Other Noncurrent Assets Investments and Other Noncurrent Assets [Text Block] CANADA CANADA Foreign Tax Credit - Brazil Foreign Tax Credit - Brazil Foreign Tax Credit - Brazil Disaggregation of Revenue [Table Text Block] Disaggregation of Revenue [Table Text Block] Stock option-based compensation costs Stock or Unit Option Plan Expense Shipping and Handling [Member] Shipping and Handling [Member] Diluted: Earnings Per Share, Diluted [Abstract] EBITDA Plant Shutdowns, Asset Impairments, Restructuring And Other Gains or losses associated with plant shutdowns, asset impairments and restructurings, gains or losses from the sale of assets, goodwill impairment losses and other non-recurring items which are not associated with the ongoing operations of a segment. Schedule of Investments [Table] Schedule of Investments [Table] Derivative Asset, Fair Value, Gross Asset Derivative Asset, Fair Value, Gross Asset Percentage of Coverage Using Cash Flow Hedges Percentage of Coverage Using Cash Flow Hedges Percentage of Coverage Using Cash Flow Hedges Amount of pre-tax gain (loss) recognized in other comprehensive income (loss) Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax Dec-23 Dec-23 [Member] Dec-23 Continuing operations Income (Loss) from Continuing Operations, Per Diluted Share Long-term Debt Long-term Debt Residential Building And Construction [Member] Residential Building And Construction [Member] Residential Building And Construction [Member] Feb-23 Feb-23 [Member] Feb-23 Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Other, net Other Operating Activities, Cash Flow Statement Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Entity Small Business Entity Small Business Operations Outside United States [Member] Operations Outside United States [Member] Operations Outside The United States [Member] Total liabilities and shareholders’ equity Liabilities and Equity Investments, Debt and Equity Securities [Abstract] Accounts and other receivables, net Accounts Receivable, after Allowance for Credit Loss Derivative financial instruments adjustment Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Other Income and Expenses [Abstract] Other Income and Expenses [Abstract] Dec-22 Dec-22 [Member] Dec-22 Jul-23 Jul-23 [Member] Jul-23 Accounts and other receivables Increase (Decrease) in Accounts and Other Receivables Liabilities and Shareholders’ Equity Liabilities and Equity [Abstract] Cost Method Investments, Original Cost Cost Method Investments, Original Cost Investment Income [Table] Investment Income [Table] Income Tax Beneficiary [Domain] Income Tax Beneficiary [Domain] Income Tax Beneficiary [Domain] Hedging Relationship [Domain] Hedging Relationship [Domain] Derivative [Line Items] Derivative [Line Items] Income tax (expense) benefit Reclassification from AOCI, Current Period, Tax Disposal Group, Including Discontinued Operation, Assets Disposal Group, Including Discontinued Operation, Assets Earnings Per Share Earnings Per Share [Text Block] Entity Interactive Data Current Entity Interactive Data Current Repurchase of employee common stock for tax withholdings Stock Issued During Period, Value, Stock Options Exercised Income taxes recoverable Income Taxes Receivable, Current Effect of exchange rate changes on cash Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash Flow Hedge Maturity Date [Axis] Cash Flow Hedge Maturity Date [Axis] Cash Flow Hedge Maturity Date [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Selling, general and administrative Selling, General and Administrative Expense Income Tax Authority [Domain] Income Tax Authority [Domain] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Address, State or Province Entity Address, State or Province Schedule Of Reclassifications Of Balances Out Of Accumulated Other Comprehensive Income (Loss) Into Net Income Schedule Of Reclassifications Of Balances Out Of Accumulated Other Comprehensive Income (Loss) Into Net Income [Table Text Block] Schedule Of Reclassifications Of Balances Out Of Accumulated Other Comprehensive Income (Loss) Into Net Income [Table Text Block] Reclassification adjustment to net income (loss), net of tax Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent Deferred Income Tax Assets, Net Deferred Income Tax Assets, Net Current liabilities: Liabilities, Current [Abstract] Shares issued upon exercise of stock options Stock Issued During Period for Stock Options Exercised and Other Miscellaneous Stock Transactions Value of stock issued during the period as a result of the exercise of stock options and other miscellaneous stock transactions, including but not limited to shares forfeited to pay payroll taxes and excess tax benefits from issuance of stock from share-based compensation plans. Debt Disclosure [Text Block] Debt Disclosure [Text Block] Foreign Currency Translation Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Dividends paid Payments of Ordinary Dividends, Common Stock Inventories Inventory Disclosure [Text Block] Line Of Credit Facility, Covenant Terms, Maximum Aggregate Dividends Line Of Credit Facility, Covenant Terms, Maximum Aggregate Dividends Line of credit facility, covenant terms, maximum aggregate dividends. Sales Net Sales Aggregrate revenue during the period from the sales of goods in the normal course of business, after deducting returns, allowances, discounts, and charges for outbound freight. Derivative Instrument [Axis] Derivative Instrument [Axis] Unrealized Gain (Loss) on Investments - kaleo Unrealized Gain (Loss) on Investments - kaleo Unrealized Gain (Loss) on Investments - kaleo Unrealized Gain (Loss) on Investments - kaleo Sep-23 Sep-23 [Member] Sep-23 Costs and expenses: Cost of Revenue [Abstract] Document Transition Report Document Transition Report Net income (loss) from continuing operations Income from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Common stock, no par value (issued and outstanding 33,965,478 shares at June 30, 2022 and 33,736,629 shares at December 31, 2021) Common Stock, Value, Issued Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Inventory, Net [Abstract] Inventory, Net [Abstract] Jan-23 Jan-23 [Member] Jan-23 Other Post-Retirement Benefits Other Postretirement Benefits Plan [Member] Electrical [Member] Electrical [Member] Electrical [Member] Entity Emerging Growth Company Entity Emerging Growth Company Earnings before interest, taxes, depreciation and amortization (EBITDA) Earnings before interest, taxes, depreciation and amortization (EBITDA) Earnings before interest, taxes, depreciation and amortization (EBITDA) Carrying value Investment Owned, at Fair Value Disposal Group, Including Discontinued Operation, Accrued Expenses Disposal Group, Including Discontinued Operation, Accrued Expenses Disposal Group, Including Discontinued Operation, Accrued Expenses Line of credit facility, covenant terms, minimum adjusted EBIT-to-interest expense ratio Line of credit facility, covenant terms, minimum adjusted EBIT-to-interest expense ratio Line of credit facility, covenant terms, minimum adjusted EBIT-to-interest expense ratio. Receivables [Abstract] Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax Pension and postretirement benefit plan contributions Payment for Pension and Other Postretirement Benefits Legal Entity [Axis] Legal Entity [Axis] Cover [Abstract] Incremental dilutive shares attributable to stock options and restricted stock Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Total Costs and Expenses Surface Protection Films [Member] Surface Protection Films [Member] Surface Protection Films [Member] Pension and other postretirement benefit obligations, net Liability, Pension and Other Postretirement and Postemployment Benefits, Noncurrent Income Tax Authority [Axis] Income Tax Authority [Axis] Income tax (expense) benefit Other Comprehensive Income (Loss) before Reclassifications, Tax Prepaid expenses and other Prepaid Expense and Other Assets, Current Cash Flow Hedge Maturity Date [Domain] Cash Flow Hedge Maturity Date [Domain] [Domain] for Cash Flow Hedge Maturity Date [Axis] Subtotal Subtotal [Member] Subtotal [Member] Selling, general & admin Selling, General and Administrative Expenses [Member] Entity [Domain] Entity [Domain] Cash dividends declared, per share Common Stock, Dividends, Per Share, Declared Accrued expenses Accrued Liabilities, Current Income Taxes [Table] Income Taxes [Table] Income Taxes [Table] Income taxes recoverable/payable Increase (Decrease) in Income Taxes Payable, Net of Income Taxes Receivable Disposal Group, Including Discontinued Operation, Operating Expense Disposal Group, Including Discontinued Operation, Operating Expense kaleo [Member] kaleo [Member] kaleo [Member] Finished goods Inventory, Finished Goods, Net of Reserves Document Quarterly Report Document Quarterly Report Stores, supplies and other Inventory, Supplies, Net of Reserves Interest income Investment Income, Interest Common Stock Common Stock [Member] Segment Reporting Segment Reporting Disclosure [Text Block] Other comprehensive income (loss), net of tax OCI, before Reclassifications, Net of Tax, Attributable to Parent Sep-22 Sep-22 [Member] Sep-22 PE Films [Member] PE Films [Member] PE Films Member. 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Brazilian Brazilian [Member] Brazilian [Member] Depreciation Depreciation Effective Income Tax Rate Reconciliation Federal Statutory Tax Rate Excluding Social Contribution On Income Effective Income Tax Rate Reconciliation Federal Statutory Tax Rate Excluding Social Contribution On Income Effective Income Tax Rate Reconciliation Federal Statutory Tax Rate Excluding Social Contribution On Income Exports From United States [Member] Exports From United States [Member] Exports From The United States [Member] Film Products Subtotal [Member] Film Products Subtotal [Member] Film Products Subtotal [Member] Derivative, Notional Amount Derivative, Notional Amount Nov-23 Nov-23 [Member] Nov-23 Other income (expense), net Other income (expense), net Other Nonoperating Income (Expense) Harbinger Capital Partners Special Situations Fund Harbinger Capital Partners Special Situations Fund [Member] Harbinger Capital Partners Special Situations Fund Capital expenditures Payments to Acquire Property, Plant, and Equipment Contribution to pension plans for continuing operations Defined Benefit Plan, Plan Assets, Contributions by Employer Total liabilities Liabilities Raw materials Inventory, Raw Materials, Net of Reserves Lease liability Short-term Lease Payments Oct-22 Oct-22 [Member] Oct-22 Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Total shareholders’ equity Beginning Balance Ending Balance Stockholders' Equity Attributable to Parent Common Stock, Shares, Issued Common Stock, Shares, Issued City Area Code City Area Code Accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Derivatives Designated As Hedging Instruments [Member] Designated as Hedging Instrument [Member] Entity Address, City or Town Entity Address, City or Town Accounts Receivable, before Allowance for Credit Loss Accounts Receivable, before Allowance for Credit Loss Oct-23 Oct-23 [Member] Oct-23 Other non-current liabilities Other non-current liabilities [Member] Other non-current liabilities Shareholders’ equity: Stockholders' Equity Attributable to Parent [Abstract] Retirement Plan Type [Axis] Retirement Plan Type [Axis] Distribution [Member] Distribution [Member] Distribution [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Comprehensive Income (Loss) Note [Text Block] Comprehensive Income (Loss) Note [Text Block] Lease liability, long-term Operating Lease, Liability, Noncurrent Aug-23 Aug-23 [Member] Aug-23 Net periodic benefit cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Pension and other postretirement benefit adjustments Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax Discontinued Operations and Disposal Groups [Abstract] Discontinued Operations and Disposal Groups [Abstract] Indebtedness To Adjusted Ebitda Ratio Greater Than Three But Less Than Or Equal To Three Point Five [Member] Indebtedness To Adjusted Ebitda Ratio Greater Than Three But Less Than Or Equal To Three Point Five [Member] Indebtedness To Adjusted Ebitda Ratio Greater Than Three But Less Than Or Equal To Three Point Five [Member] Retained earnings Retained Earnings (Accumulated Deficit) Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Entity Filer Category Entity Filer Category Gain (Loss) on Investments Gain (Loss) on Investments Income Statement [Abstract] Income Statement [Abstract] Entity Registrant Name Entity Registrant Name Commitment Fee on Credit Facility, basis points Commitment Fee on Credit Facility, basis points Commitment Fee on Credit Facility, basis points Consumer Durables [Member] Consumer Durables [Member] Consumer Durables [Member] Other Noncurrent Assets Other Noncurrent Assets [Member] Effective Income Tax Rate Reconciliation Federal Statutory Tax Rate Including Social Contribution On Income Effective Income Tax Rate Reconciliation Federal Statutory Tax Rate Including Social Contribution On Income Effective Income Tax Rate Reconciliation Federal Statutory Tax Rate Including Social Contribution On Income Jul-22 Jul-22 [Member] Jul-22 Income Taxes [Line Items] Income Taxes [Line Items] Income Taxes [Line Items] Income tax expense (benefit) Income Tax Expense (Benefit) Income Tax Expense (Benefit) Amendment Flag Amendment Flag Equity Components [Axis] Equity Components [Axis] Disposal Group, Including Discontinued Operation, General and Administrative Expense Disposal Group, Including Discontinued Operation, General and Administrative Expense Entity Tax Identification Number Entity Tax Identification Number Document Fiscal Period Focus Document Fiscal Period Focus Total current assets Assets, Current Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Inventories Inventory, Net Schedule Of Segment Reporting Information By Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Equity Method Investments and Joint Ventures [Abstract] Equity Method Investments and Joint Ventures [Abstract] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Product and Service [Axis] Product and Service [Axis] Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Basis Of Presentation Basis of Accounting [Text Block] Other Income and Other Expense Disclosure [Text Block] Other Income and Other Expense Disclosure [Text Block] Equity Component [Domain] Equity Component [Domain] Mar-23 Mar-23 [Member] Mar-23 Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Foreign currency translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of 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Sheet Location, by Derivative Contract Type [Table] Basic Weighted average shares outstanding used to compute basic earnings per share Weighted Average Number of Shares Outstanding, Basic Earnings Per Share, Diluted Earnings Per Share, Diluted Segments [Domain] Segment [Domain] Segments [Domain] Debt principal payments Repayments of Long-term Lines of Credit Reduction of right-of-use lease asset Operating Lease, Right-of-Use Asset, Amortization Expense Product [Member] Product [Member] Oct-2018 [Member] Oct-2018 [Member] Oct-2018 [Member] Service cost Defined Benefit Plan, Service Cost Hedging Relationship [Axis] Hedging Relationship [Axis] Comprehensive Income (Loss), Net of Tax, Attributable to Parent, Total Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive Income (Loss), Net of Tax, Attributable to Parent Identifiable intangible assets, net Intangible Assets, Net (Excluding Goodwill) Gain on investment in kaléo Unrealized Gain (Loss) on Investments 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benefit plan estimated required future employer contributions in current fiscal year. 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Interest expense Interest and Debt Expense Common stock held in trust for savings restoration plan (110,564 shares at June 30, 2022 and 108,433 shares at December 31, 2021) Common Stock Held in Trust Income Statement and Other Comprehensive Income (Loss) Location [Domain] Income Statement Location [Domain] May-23 May-23 [Member] May-23 Indebtedness To Adjusted Ebitda Ratio Greater Than Three Point Five But Less Than Or Equal To Four [Member] Indebtedness To Adjusted Ebitda Ratio Greater Than Three Point Five [Member] Indebtedness To Adjusted Ebitda Ratio Greater Than Three Point Five Net property, plant and equipment Property, Plant and Equipment, Net Other non-current liabilities Other Liabilities, Noncurrent Derivative Asset, Fair Value, Gross Liability Derivative Asset, Fair Value, Gross Liability Lender Name [Axis] Lender Name [Axis] Trading Symbol Trading Symbol Basic: Earnings Per Share [Abstract] Discontinued operations (in USD per share) Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share Revenue from Contract with Customer by Geographic Location [Abstract] Revenue from Contract with Customer by Geographic Location [Abstract] Revenue from Contract with Customer by Geographic Location [Abstract] Property, plant and equipment, at cost Property, Plant and Equipment, Gross Accounts Receivable, Allowance for Credit Loss Accounts Receivable, Allowance for Credit Loss Terphane Ltda [Member] Terphane Ltda [Member] Terphane Ltda [Member] Revenues Revenues Gain (loss) on derivative financial instruments AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax Line of Credit Facility [Table] Line of Credit Facility [Table] Brazil One-time Tax Credit PIS/COFINS Brazil One-time Tax Credit PIS/COFINS Brazil One-time Tax Credit PIS/COFINS Discontinued operations Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Table] Long-term debt Long-term Debt, Excluding Current Maturities Stock-based compensation expense Share-based Payment Arrangement, Expense Europe [Member] Europe [Member] Entity Current Reporting Status Entity Current Reporting Status Effective Income Tax Rate Reconciliation, Percent Effective Income Tax Rate Reconciliation, Percent Schedule Of Pretax Effect On Net Income (Loss) And Other Comprehensive Income (Loss) Of Derivative Instruments Classified As Cash Flow Hedges Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) [Table Text Block] Accounts Receivable, before Allowance for Credit Loss, Current Accounts Receivable, before Allowance for Credit Loss, Current Current Effective Tax Rate Including Social Contribution On Income Current Effective Tax Rate Including Social Contribution On Income Current Effective Tax Rate Including Social Contribution On Income Disposal Group, Including Discontinued Operation, adjustment to fair value Disposal Group, Including Discontinued Operation, adjustment to fair value Disposal Group, Including Discontinued Operation, adjustment to fair value Flexible Packaging Films [Member] [Domain] Flexible Packaging Films [Member] [Domain] Flexible Packaging Films [Member] [Domain] Stock-based compensation expense Share Based Compensation Expense, Value Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, stock options, restricted stock or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. Cash and cash equivalents Cash, cash equivalents, and restricted cash at beginning of period Cash, cash equivalents, and restricted cash at end of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Derivative, Description of Hedged Item Schedule of Derivative Instruments [Table Text Block] UNITED STATES UNITED STATES Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Income taxes payable Taxes Payable, Current Current assets: Assets, Current [Abstract] Other Proceeds from (Payments for) Other Financing Activities Other Nonoperating Income (Expense), Net - Other Other Nonoperating Income (Expense), Net - Other Other Nonoperating Income (Expense), Net - Other Reclassification adjustment to net income (loss) Reclassification from AOCI, Current Period, before Tax, Attributable to Parent Entity Address, Postal Zip Code Entity Address, Postal Zip Code Diluted Shares used to compute diluted earnings per share Weighted Average Number of Shares Outstanding, Diluted Income Taxes Income Tax Disclosure [Text Block] Disposal Groups, Including Discontinued Operations Disposal Groups, Including Discontinued Operations [Table Text Block] Gain (Loss) on Derivative Financial Instruments Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Credit Facility [Axis] Credit Facility [Axis] Entity Address, Address Line One Entity Address, Address Line One Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Other Receivables, Gross, Current Other Receivables, Gross, Current Changes in assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Aluminum Extrusions Subtotal [Member] Aluminum Extrusions Subtotal [Member] Aluminum Extrusions Subtotal [Member] Less: accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Indebtedness To Adjusted Ebitda Ratio Greater Than Two But Less Than Or Equal To Three [Member] Indebtedness To Adjusted Ebitda Ratio Greater Than Two But Less Than Or Equal To Three [Member] Indebtedness-To-Adjusted EBITDA Ratio Greater Than Two But Less Than Or Equal To Three [Member] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Entity Shell Company Entity Shell Company Credit Facility covenant maximum liquidity Credit Facility covenant maximum liquidity Credit Facility covenant maximum liquidity Total current liabilities Liabilities, Current Commitment Under Cash Flow Hedges, Mass Commitment Under Cash Flow Hedges, Mass Commitment Under Cash Flow Hedges, Mass Trust for Savings Restoration Plan Trust For Saving Restoration Plan [Member] Trust For Saving Restoration Plan. Earnings before interest and taxes (EBIT) Earnings before interest and taxes (EBIT) Earnings before interest and taxes (EBIT) Indebtedness To Adjusted Ebitda Ratio Greater Than One But Less Than Or Equal To Two [Member] Indebtedness To Adjusted Ebitda Ratio Greater Than One But Less Than Or Equal To Two [Member] Indebtedness-To-Adjusted EBITDA Ratio Greater Than One But Less Than Or Equal To Two [Member] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Line of Credit Facility, Maximum Borrowing Capacity Line of Credit Facility, Maximum Borrowing Capacity Disposal Group, Including Discontinued Operation, Other Accrued Expense Disposal Group, Including Discontinued Operation, Other Accrued Expense Disposal Group, Including Discontinued Operation, Other Accrued Expense Asia [Member] Asia [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Latin America [Member] Latin America [Member] Current Fiscal Year End Date Current Fiscal Year End Date Line of credit facility, covenant terms, maximum debt to EBITDA ratio Line of credit facility, covenant terms, maximum debt to EBITDA ratio Line of credit facility, covenant terms, maximum debt to EBITDA ratio Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Asset impairments and costs associated with exit and disposal activities, net of adjustments Asset Impairment And Costs Associated With Exit And Disposal Activities - impairment Line Amounts charged against earnings for incurred and estimated one-time, nonrecurring costs assoicated with asset impariments and exit and disposal activities. Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Current assets of discontinued operations Disposal Group, Including Discontinued Operation, Assets, Current Statement [Table] Statement [Table] Disposal Group Including Discontinued Operation Cash Proceeds Disposal Group Including Discontinued Operation Cash Proceeds Disposal Group Including Discontinued Operation Cash Proceeds Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position Prepaid Expenses and Other Current Assets Prepaid Expenses and Other Current Assets [Member] Accrued Expenses [Member] Accrued Expenses [Member] Accrued Expenses [Member] Schedule Of Components Of Net Periodic Benefit Cost For Pension And Other Post-Retirement Benefit Programs Schedule Of Components Of Net Periodic Benefit Cost For Pension And Other Post-Retirement Benefit Programs [Table Text Block] Schedule Of Components Of Net Periodic Benefit Cost For Pension And Other Post-Retirement Benefit Programs [Table Text Block] Liability derivatives: Fair Value Derivative Liability, Fair Value, Gross Liability Other Nonrecurring Expense Other Nonrecurring Expense Disposal Group, Including Discontinued Operation, Operating Income (Loss) Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax Goodwill Goodwill Amount of pre-tax gain (loss) reclassified from accumulated other comprehensive income (loss) to net income (effective portion) Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax Cost of goods sold Cost of Sales [Member] Amortization of prior service costs and net gains or losses, tax Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax Amortization of prior service costs and net gains or losses Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax Nonresidential Building And Construction [Member] Nonresidential Building And Construction [Member] Nonresidential Building And Construction [Member] Other Nonoperating Expense Other Nonoperating Expense Pension Benefits Pension Plan [Member] Disposal Group, Including Discontinued Operation, Other Receivable Disposal Group, Including Discontinued Operation, Other Receivable Disposal Group, Including Discontinued Operation, Other Receivable Summary Of Location And Fair Value Of Derivative Financial Instruments Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Pension & Other Postretirement Benefit Adjust Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Net Investment Income [Line Items] Net Investment Income [Line Items] Income Tax Beneficiary [Axis] Income Tax Beneficiary [Axis] Income Tax Beneficiary [Axis] Annual Net Costs Mismatch Translation Exposure - Real vs US Dollar Annual Net Costs Mismatch Translation Exposure - Real vs US Dollar Annual Net Costs Mismatch Translation Exposure - Real vs US Dollar Adjustments for noncash items: Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]