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Entity Registrant Name Treasury stock, shares (in shares) Treasury Stock, Shares Interest expense, net Interest Income (Expense), Net Less: Present value discount Lessee, Operating Lease, Liability, Undiscounted Excess Amount Recognized in current year Contract With Customer Asset New Contract Additions Contract With Customer Asset New Contract Additions Work-in-progress Inventory, Work in Process, Net of Reserves 3.2000 Percent Senior Notes Due 2025 3.20% Senior Notes, due 2025 3.2000 Percent Senior Notes Due Two Thousand and Twenty Five [Member] 3.2000 Percent Senior Notes Due Two Thousand and Twenty Five Total net sales Total sales Revenue from Contract with Customer, Excluding Assessed Tax Unrecognized tax benefits subject to change within the next 12 months Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit Less: Present value discount Finance Lease, Liability, Undiscounted Excess Amount Assets acquired Business Combination, 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Collections reinvested under revolving agreement Repayments of Accounts Receivable Securitization Denver Transit, Installation of Constant Wireless Crossings Denver Transit Installation of Constant Wireless Crossings [Member] Denver Transit Installation of Constant Wireless Crossings [Member] Geographical [Axis] Geographical [Axis] Debt Instrument, Covenant, Period [Axis] Debt Instrument, Covenant, Period [Axis] Debt Instrument, Covenant, Period Basic (in shares) Basic weighted average common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Net income attributable to Wabtec shareholders (in dollars per share) Diluted (in dollars per share) Earnings Per Share, Diluted Segments [Domain] Segments [Domain] Goods Product [Member] Remaining 2021 Lessee, Operating And Finance Lease, Liability, Total, Payments, Remainder of Fiscal Year Lessee, Operating And Finance Lease, Liability, Total, Payments, Remainder of Fiscal Year Non-US Non-US [Member] Comprehensive income attributable to Wabtec shareholders Comprehensive Income (Loss), Net of Tax, Attributable to Parent Other intangible assets, net Intangible Assets, Net (Excluding Goodwill) Balance at beginning of year Balance at end of period Contract with Customer, Liability Net cash used for financing activities Net Cash Provided by (Used in) Financing Activities Treasury stock, at cost, 37.9 and 38.0 shares, at June 30, 2021 and December 31, 2020, respectively Treasury Stock, Value Weighted average shares outstanding Weighted Average Number of Shares Outstanding, Diluted [Abstract] Deferred income taxes Deferred Income Tax Liabilities, Net Award vesting period (in years) Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Equity income Income (Loss) from Equity Method Investments Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Property, plant and equipment Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Maturity of Finance Lease Liabilities Finance Lease, Liability, Fiscal Year Maturity [Table Text Block] Accounts payable Accounts Payable, Current Concentration Risk By Type Concentration Risk Type [Axis] Threatened Litigation Threatened Litigation [Member] Collateral Held [Axis] Collateral Held [Axis] Less: dividends declared - common shares and non-vested restricted stock Dividends, Common Stock, Stock 2024 Finite-Lived Intangible Asset, Expected Amortization, Year Three Accumulated Other Comprehensive Loss AOCI Attributable to Parent AOCI Attributable to Parent [Member] Remainder of 2021 Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year Intellectual property, patents, non-compete and other intangibles Intellectual Property, Patents And Other [Member] Intellectual Property, Patents and other. Inventories Increase (Decrease) in Inventories Interest Coverage Ratio Debt Instrument, Restrictive Covenants, EBITDA to Interest Expense Ratio, Minimum Debt Instrument, Restrictive Covenants, EBITDA to Interest Expense Ratio, Minimum Balance at beginning of year Balance at end of period Contract with Customer, Asset, after Allowance for Credit Loss Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Derivative [Table] Derivative [Table] Unrealized gain (loss) on derivative contracts Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax Balance at beginning of year Balance at end of period Standard and Extended Product Warranty Accrual Total cost of sales Cost of Goods and Services Sold Net sales: Revenues [Abstract] 2023 Lessee, Operating And Finance Lease, Liability, Total Payments, Due Year Two Lessee, Operating And Finance Lease, Liability, Total Payments, Due Year Two Accrued warranty Product Warranty Accrual, Current Concentration Risk Benchmark Concentration Risk Benchmark [Domain] Consolidated Entities [Domain] Consolidated Entities [Domain] Options Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Corporate Activities and Elimination Corporate And Eliminations [Member] Corporate And Eliminations [Member] Investing Activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Total Total Payments Due [Abstract] Total Payments Due [Abstract] Total Lease, Cost Debt instrument, term Debt Instrument, Term Equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Customer Relationships Customer Relationships [Member] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Total assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Including Goodwill Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Including Goodwill Property, plant and equipment, net Property, Plant and Equipment, Net Total operating expenses Operating Expenses Other long term liabilities Other Liabilities, Noncurrent Net cash proceeds received Proceeds from (Repayments of) Accounts Receivable Securitization Schedule of Long-term Debt Schedule of Long-term Debt Instruments [Table Text Block] Amortization Expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Stock repurchase (in shares) Treasury Stock, Shares, Acquired Debt Instrument [Line Items] Debt Instrument [Line Items] Earnings Per Share [Abstract] Earnings Per Share [Abstract] Other current assets Derivative Asset Document Quarterly Report Document Quarterly Report Equipment Equipment [Member] Remaining performance obligation percentage expected to be recognized Revenue, Remaining Performance Obligation, Percentage Amounts reclassified from Accumulated other comprehensive loss Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Other current liabilities Other Current Liabilities [Member] Foreign currency impact Contract With Customer Asset Increase (Decrease) Foreign Currency Translation Adjustment Contract With Customer Asset Increase (Decrease) Foreign Currency Translation Adjustment Foreign Exchange Contracts Foreign Exchange Contract [Member] Beginning balance (in dollars per share) Ending balance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Long-term debt Long-term Debt, Excluding Current Maturities Schedule Of Goodwill [Table] Schedule of Goodwill [Table] Stock-based compensation expense Share-based Payment Arrangement, Expense Provisions for loss contracts Provision for Loss on Contracts Exercisable weighted average remaining contractual life (in years) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Earnings Per Common Share Net income attributable to Wabtec shareholders per common share Earnings Per Share, Basic and Diluted [Abstract] Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Document Fiscal Period Focus Document Fiscal Period Focus Effective tax rate Effective Income Tax Rate Reconciliation, Percent Other Borrowings Other Debt Obligations [Member] Net income Net income Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Transit Segment Transit Segment [Member] Transit segment. Total liabilities assumed Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Unbilled accounts receivable Contract with Customer, Asset, after Allowance for Credit Loss, Current Beginning Balance (in shares) Ending Balance (in shares) Shares, Issued Consolidation, Eliminations Consolidation, Eliminations [Member] Thereafter Finance Lease, Liability, Payments, Due after Year Four Finance Lease, Liability, Payments, Due after Year Four Product Information [Line Items] Product Information [Line Items] Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Number of countries where product is found (more than) Number Of Countries Where Product Found Number of countries where product found. Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Current Assets Assets, Current [Abstract] Other financing activities Proceeds from (Payments for) Other Financing Activities Leases [Abstract] Leases [Abstract] Cost of sales: Cost of Goods and Services Sold [Abstract] Entity Central Index Key Entity Central Index Key Intangible Assets of the Company, Other Than Goodwill and Trade Names Schedule of Finite-Lived Intangible Assets [Table Text Block] Intangible assets, weighted average useful life (years) Finite-Lived Intangible Assets, Remaining Amortization Period Security Exchange Name Security Exchange Name Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Revenue Recognition Revenue from Contract with Customer [Policy Text Block] Undistributed earnings allocated to common shareholders Undistributed Earnings Allocated To Common Shareholders The amount of undistributed earnings allocated to common shareholders for the periods presented. Revolving Receivables Program Accounts Receivable Securitization, Policy [Policy Text Block] Accounts Receivable Securitization, Policy Diluted (in shares) Denominator for diluted earnings per common share adjusted weighted average shares and assumed conversion (in shares) Weighted Average Number of Shares Outstanding, Diluted Other comprehensive income (loss), net of tax Other comprehensive income (loss), net Other Comprehensive Income (Loss), Net of Tax Liabilities assumed Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract] Income Taxes Income Tax Disclosure [Text Block] Multi-Currency Revolving Loan Facility Multi-Currency Revolving Loan Facility [Member] Multi-Currency Revolving Loan Facility Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Current Fiscal Year End Date Current Fiscal Year End Date Stock Option Activity Share-based Payment Arrangement, Option, Activity [Table Text Block] Measurement Basis [Axis] Measurement Basis [Axis] Derivative contracts Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Other income and expenses: Nonoperating Income (Expense) [Abstract] Cross-currency Swaps Cross-Currency Swap Agreement Currency Swap [Member] Non-Designated Not Designated as Hedging Instrument [Member] Aggregate Intrinsic value (in millions) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments, Nonvested, Aggregate Intrinsic Value [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments, Nonvested, Aggregate Intrinsic Value [Roll Forward] Credit Facility Credit Facility [Axis] Finite Lived Intangible Assets Major Class Name Finite-Lived Intangible Assets, Major Class Name [Domain] Net cash used for investing activities Net Cash Provided by (Used in) Investing Activities Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Changes in operating assets and liabilities, net of acquisitions Increase (Decrease) in Operating Capital [Abstract] Other current assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other 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 4.150 Percent Senior Notes Due 2024 4.150 Percent Senior Notes Due Two Thousand and Twenty Four [Member] 4.150 Percent Senior Notes Due Two Thousand and Twenty Four [Member] Intangible Assets Disclosure [Line Items] Intangible Assets Disclosure [Line Items] Intangible assets disclosure. Expected life (years) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Total current liabilities Liabilities, Current Litigation Status [Domain] Litigation Status [Domain] Foreign Exchange Forward Foreign Exchange Forward [Member] Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Foreign currency impact Goodwill, Foreign Currency Translation Gain (Loss) Loss Contingencies [Table] Loss Contingencies [Table] Cash and cash equivalents Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Unamortized debt issuance cost Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Reclassified to accounts receivable Contract with Customer, Asset, Reclassified to Receivable Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Remaining 2021 Finance Lease, Liability, to be Paid, Remainder of Fiscal Year Title of 12(b) Security Title of 12(b) Security Statement [Table] Statement [Table] Other current assets Other Assets, Current Accounting Standards Recently Adopted New Accounting Pronouncements, Policy [Policy Text Block] Unamortized compensation expense expected to be vested Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Statistical Measurement [Axis] Statistical Measurement [Axis] Liabilities at fair value Derivative Liability, Fair Value, Gross Liability Cover page. Cover [Abstract] Intangible assets, net of accumulated amortization Finite-Lived Intangible Assets, Net Goodwill Beginning balance Ending balance Goodwill Noncontrolling interest Stockholders' Equity Attributable to Noncontrolling Interest 4.70 Percent Senior Notes Due 2028 4.70 Percent Senior Notes Due Two Thousand and Twenty Six [Member] 4.70 Percent Senior Notes Due Two Thousand and Twenty Eight [Member] Scenario [Domain] Scenario [Domain] Change in the Carrying Amount of Goodwill by Segment Schedule of Goodwill [Table Text Block] Business Nature of Operations [Text Block] Adjustments to reconcile net income to cash provided by (used for) operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Components Components [Member] Components Accrued liabilities and customer deposits Increase Decrease In Accrued Liabilities And Customer Deposits Increase decrease in accrued liabilities and customer deposits. Summary of Notional Amounts and Fair Value Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Operating lease expense Operating Lease, Cost 4.375% Senior Notes, due 2023 4.375 Percent Senior Notes Due Two Thousand and Twenty Three [Member] 4.375 Percent Senior Notes Due Two Thousand and Twenty Three [Member] Concentration Risk By Benchmark Concentration Risk Benchmark [Axis] Pension and post retirement benefit plans Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Thereafter Lessee, Operating Lease, Liability, Payments, Due after Year Four Lessee, Operating Lease, Liability, Payments, Due after Year Four Schedule Of Finite Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Acquisitions Contract with Customer, Liability, Increase (Decrease) for Contract Acquired in Business Combination Leverage ratio Leverage Ratio Debt Instrument, Restrictive Covenants, Leverage Ratio, Maximum Debt Instrument, Restrictive Covenants, Leverage Ratio, Maximum