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Stock Option Share-Based Payment Arrangement, Option [Member] Change in unearned revenue Change In Unearned Revenue Change In Unearned Revenue Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Asset Class [Axis] Asset Class [Axis] Restructuring expense Additional Charges Restructuring Charges Inventory Disclosure [Abstract] Inventory Disclosure [Abstract] Tabular List, Table Tabular List [Table Text Block] Foreign debt Other Long-Term Debt Other non-operating (income)—net Other Nonoperating Income (Expense) Other—net Total Other Operating Income (Expense), Net Name Awards Close in Time to MNPI Disclosures, Individual Name 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] Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Change in accounts receivable, trade Contract With Customer Asset Net Current Change Contract With Customer Asset Net Current Change Serial preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Payments for mine development Payments to Acquire Mining Assets Serial preferred stock (no par value; 5,000 authorized shares, none issued) Preferred Stock, Value, Issued Location, Statement of Financial Position, Activity, Accrual [Axis] Location, Statement of Financial Position, Activity, Accrual [Axis] Adjustment to Compensation: Adjustment to Compensation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Foreign currency forward contracts - euro Precious Metal Swaps [Member] Precious metal swaps. 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] Hedging Designation [Axis] Hedging Designation [Axis] Foreign Currency Foreign currency forward contracts Foreign Exchange Forward [Member] Performance Materials Performance Alloys and Composites [Member] Performance Alloys and Composites [Member] Directors' deferred compensation Stock Issued During Period Value Directors Deferred Compensation Stock Issued during period value directors deferred compensation. Derivative, gain (loss), statement of income or comprehensive income [Extensible Enumeration] Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Credit Facility [Axis] Credit Facility [Axis] Restructuring Restructuring and Related Activities Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Financial assets Assets, Fair Value Disclosure Denominator: Denominator [Abstract] Denominator Name Measure Name Income Taxes Income Tax Disclosure [Text Block] Accounts payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Other Other Operating Segment [Member] Contract asset percent change Contract with Customer Asset Percent Change Contract with Customer Asset Percent Change Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Entity Filer Category Entity Filer Category Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and Cash Equivalent Company Selected Measure Amount Company Selected Measure Amount Not designated as hedging instrument Not Designated as Hedging Instrument [Member] Depreciation, depletion, and amortization Depreciation, Depletion and Amortization Current assets Assets, Current [Abstract] Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Income tax expense Income Tax Expense (Benefit) Foreign currency loss (gain) Gain (Loss), Foreign Currency Transaction, before Tax Other-net Other Income and Other Expense Disclosure [Text Block] Effect of dilutive securities: Dilutive Securities, Effect on Basic Earnings Per Share [Abstract] Cost of sales Cost of Product and Service Sold Award Timing Method Award Timing Method [Text Block] Net change in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Derivative liability, notional amount Derivative Liability, Notional Amount Amortization of net loss (gain) Defined Benefit Plan, Amortization of Gain (Loss) AOCI Attributable to Parent, Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Net income Net income Net Income (Loss) Attributable to Parent Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Unamortized deferred financing fees Unamortized Debt Issuance Expense Location, Statement of Financial Position, Balance [Axis] Location, Statement of Financial Position, Balance [Axis] Statement [Table] Statement [Table] Proceeds from sale of property, plant, and equipment Proceeds from Sale of Property, Plant, and Equipment Restatement Determination Date: Restatement Determination Date [Axis] Schedule of Accumulated Other Comprehensive Income Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Term Loan Facility Term Loan Facility [Member] Term Loan Facility Derivative, term (maximum) Derivative, Contract Term Deferred compensation investments Deferred Compensation, Excluding Share-Based Payments and Retirement Benefits [Member] Performance Materials Performance Materials [Member] Performance Materials Schedule of Contract with Customer, Asset and Liability Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Derivative asset, fair value, gross asset Derivative Asset, Subject to Master Netting Arrangement, before Offset Proceeds from (repayments of) borrowings under credit facilities, net Proceeds from Short-Term Debt Prepayments from customers Proceeds from Deposits from Customers Additional liquidity Line Of Credit Facility Additional Liquidity Line Of Credit Facility Additional Liquidity Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Interest and taxes payable Increase Decrease In Interest And Taxes Payable The increase (decrease) during the period in the amount due for taxes based on the reporting entity's earnings or attributable to the entity's income earning process (business presence) within a given jurisdiction and the increase (decrease) during the reporting period in interest payable, which represents the amount owed to note holders, bond holders, and other parties for interest earned on loans or credit extended to the reporting entity.