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Numerator Activity [Abstract] Derivative asset fair value Derivative Asset, Fair Value, Gross Asset Proceeds from treasury stock issued from the exercise of stock options and other benefit plans, net of tax (in shares) Stock Granted Exercised And Cancelled For Various Equity Instruments Stock awards granted, exercised and cancelled for the following forms of stock compensation 1) Stock Options 2) Restricted Stock Awards and 3) Incentive Stock Awards. 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500.0 shares authorized: 226.9 shares issued and 188.9 outstanding at March 31, 2021 and December 31, 2020 Common Stock, Value, Issued Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Finite Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Document Fiscal Year Focus Document Fiscal Year Focus 2023 Finite-Lived Intangible Asset, Expected Amortization, Year Two Proceeds from debt Proceeds from Issuance of Long-term Debt and Capital Securities, Net Income tax benefit (expense) related to components of other comprehensive income Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Exercisable, aggregate intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Current portion of long-term debt Long-term Debt, Current Maturities Entity Current Reporting Status Entity Current Reporting Status 2025 Finance Lease, Liability, to be Paid, Year Four Total lease payments Lessee, Operating And Finance Lease, Liability, Payments Due Lessee, Operating And Finance Lease, Liability, Payments Due Cross-currency Swaps Currency Swap [Member] Denver Transit, Installation of Constant Wireless Crossings Denver Transit Installation of Constant Wireless Crossings [Member] Denver Transit Installation of Constant Wireless Crossings [Member] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Noncontrolling interest Stockholders' Equity Attributable to Noncontrolling Interest Granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Inventory Disclosure [Abstract] Inventory Disclosure [Abstract] Percentage of incentive stock awards expected to be vested and awarded of stocks granted (as a percent) Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Common stock, shares issued (in shares) Common Stock, Shares, Issued Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value 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 Schedule Of Product Information [Table] Schedule of Product Information [Table] Foreign Exchange Forward Foreign Exchange Forward [Member] Present value of lease liabilities Operating Lease, Liability Litigation Status [Axis] Litigation Status [Axis] Long-term debt Long-term Debt, Excluding Current Maturities Segment Reporting [Abstract] Segment Reporting [Abstract] Accounts receivable and unbilled accounts receivable Increase (Decrease) in Accounts Receivable Debt Instrument [Line Items] Debt Instrument [Line Items] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Total Westinghouse Air Brake Technologies Corporation shareholders’ equity Stockholders' Equity Attributable to Parent Business Nature of Operations [Text Block] Business combination, consideration transferred Business Combination, Consideration Transferred Concentration Risk Type Concentration Risk Type [Domain] Total Liabilities and Equity Liabilities and Equity Loss Contingencies [Line Items] Loss Contingencies [Line Items] Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Income Taxes Income Tax Disclosure [Text Block] Entity Address, City or Town Entity Address, City or Town Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Accrued compensation Employee-related Liabilities, Current Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Operating lease expense Operating Lease, Cost Net assets acquired Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net Total liabilities assumed Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Hedging Relationship [Axis] Hedging Relationship [Axis] Patents Intellectual Property [Member] Shares not included in computation of diluted earnings per share Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Finance leases Finance Lease, Weighted Average Remaining Lease Term Goods Product [Member] Intellectual property, patents, non-compete and other intangibles Intellectual Property, Patents And Other [Member] Intellectual Property, Patents and other. Interest coverage ratio Debt Instrument, Restrictive Covenants, EBITDA to Interest Expense Ratio, Minimum Debt Instrument, Restrictive Covenants, EBITDA to Interest Expense Ratio, Minimum Trade names, useful life Finite-Lived Intangible Asset, Useful Life Equity Component [Domain] Equity Component [Domain] Gross profit Gross Profit 2023 Lessee, Operating And Finance Lease, Liability, Total Payments, Due Year Two Lessee, Operating And Finance Lease, Liability, Total Payments, Due Year Two Property, plant and equipment, net Property, Plant and Equipment, Net 2024 Finite-Lived Intangible Asset, Expected Amortization, Year Three Entity Tax Identification Number Entity Tax Identification Number Revenue Recognition Revenue from Contract with Customer [Policy Text Block] Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Stock-Based Compensation Share-based Payment Arrangement [Text Block] Net income attributable to Wabtec shareholders Net income attributable to Wabtec shareholders Net Income (Loss) Attributable to Parent Changes in operating assets and liabilities, net of acquisitions Increase (Decrease) in Operating Capital [Abstract] Remaining 2021 Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Inventories Inventory Disclosure [Text Block] Other comprehensive loss, net of tax Net current-period other comprehensive (loss) income Other Comprehensive Income (Loss), Net of Tax Trade Names Trade Names [Member] Corporate Activities and Elimination Corporate And Eliminations [Member] Corporate And Eliminations [Member] Leases [Abstract] Leases [Abstract] Total Total Payments Due [Abstract] Total Payments Due [Abstract] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Total current assets Assets, Current Current Fiscal Year End Date Current Fiscal Year End Date Operating expenses: Operating Expenses [Abstract] Earnings Per Share [Abstract] Earnings Per Share [Abstract] Present value of lease liabilities Finance Lease, Liability 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 Pension and post retirement benefit plans Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Other intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Options Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Document Fiscal Period Focus Document Fiscal Period Focus Noncurrent contract liabilities Contract with Customer, Liability, Noncurrent Numerator for diluted earnings per common share Net Income (Loss) Available to Common Stockholders, Diluted Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures Foreign currency impact Contract With Customer Asset Increase (Decrease) Foreign Currency Translation Adjustment Contract With Customer Asset Increase (Decrease) Foreign Currency Translation Adjustment Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Debt issuance price (as a percent) Debt Instrument, Redemption Price, Percentage Entity Filer Category Entity Filer Category Common Stock Common Stock [Member] Foreign currency translation Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Products And Services Product and Service [Domain] Concentration Risk Benchmark Concentration Risk Benchmark [Domain] Cash dividends Dividends, Cash Finance leases Finance Lease, Weighted Average Discount Rate, Percent Geographic Concentration Risk Geographic Concentration Risk [Member] Current Availability Line of Credit Facility, Remaining Borrowing Capacity Sales Revenue Outside United States Revenue Benchmark [Member] Stated interest rate (as a percent) Debt Instrument, Interest Rate, Stated Percentage Performance obligation period Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Transit Segment Transit Segment [Member] Transit segment. Unbilled accounts receivable Contract with Customer, Asset, after Allowance for Credit Loss, Current Thereafter Finance Lease, Liability, Payments, Due after Year Four Finance Lease, Liability, Payments, Due after Year Four Diluted Earnings Per Share, Diluted [Abstract] Exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Number of countries where product is found (more than) Number Of Countries Where Product Found Number of countries where product found. (Decrease) increase in cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Acquisitions Business Combination Disclosure [Text Block] Other income (expense), net Total other income (expense), net Nonoperating Income (Expense) Hedging Relationship [Domain] Hedging Relationship [Domain] Maturity of Operating Lease Liabilities Lessee, Operating Lease, Liability, Maturity [Table Text Block] Stock Option Share-based Payment Arrangement, Option [Member] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Basic (in shares) Basic weighted average common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Risk-free interest rate (as a percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Canceled (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price 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. Treasury stock, shares (in shares) Treasury Stock, Shares Revolving Receivables Program Accounts Receivable Securitization, Policy [Policy Text Block] Accounts Receivable Securitization, Policy Cash Flow Hedging Cash Flow Hedging [Member] Collateral Pledged Collateral Pledged [Member] Loss Contingencies [Table] Loss Contingencies [Table] Multi-Currency Revolving Loan Facility Multi-Currency Revolving Loan Facility [Member] Multi-Currency Revolving Loan Facility Plan Name Plan Name [Domain] Contract Assets and Contract Liabilities Revenue from Contract with Customer [Text Block] Total Equity Beginning Balance Ending Balance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Remaining 2021 Finance Lease, Liability, to be Paid, Remainder of Fiscal Year 2022 Finite-Lived Intangible Asset, Expected Amortization, Year One Income tax expense Income Tax Expense (Benefit) Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Aggregate Intrinsic Value 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] Net income attributable to Wabtec shareholders (in dollars per share) Diluted (in dollars per share) Earnings Per Share, Diluted Local Phone Number Local Phone Number 4.150 Percent Senior Notes Due Two Thousand and Twenty Four 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. Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Schedule of Debt Schedule of Debt [Table Text Block] Derivative [Line Items] Derivative [Line Items] Goodwill and Intangible Assets Goodwill and Intangible Assets, Policy [Policy Text Block] Consolidation, Eliminations Consolidation, Eliminations [Member] Schedule of Long-term Debt Schedule of Long-term Debt Instruments [Table Text Block] Entity Address, Address Line One Entity Address, Address Line One Balance at beginning of year Balance at end of period Contract with Customer, Liability Entity Emerging Growth Company Entity Emerging Growth Company Threatened Litigation Threatened Litigation [Member] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Proceeds from treasury stock issued from the exercise of stock options and other benefit plans, net of tax Stock Issued During Period, Value, Stock Options Exercised Schedule Of Finite Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Liabilities at fair value Derivative Liability, Fair Value, Gross Liability Maximum borrowing capacity Maximum Availability Line of Credit Facility, Maximum Borrowing Capacity Award Type Award Type [Axis] 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] Intangible assets, accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Maximum Maximum [Member] Other noncurrent assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets Non-controlling Interest Noncontrolling Interest [Member] Fair Value Measurement and Fair Value of Financial Instruments Fair Value Measurement and Measurement Inputs, Recurring and Nonrecurring [Text Block] Retained Earnings Retained Earnings [Member] Measurement Basis [Axis] Measurement Basis [Axis] Unrealized (loss) gain on derivative contracts Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax Effective tax rate Effective Income Tax Rate Reconciliation, Percent Accounting Policies Significant Accounting Policies [Text Block] Net cash used for investing activities Net Cash Provided by (Used in) Investing Activities Outstanding, weighted average remaining contractual life (in years) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Share Based Compensation Arrangements By Share Based Payment Award Award Type And Plan Name Award Type [Domain] Trading Symbol Trading Symbol Exercisable (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] 4.70 Percent Senior Notes Due Two Thousand and Twenty Six 4.70 Percent Senior Notes Due Two Thousand and Twenty Six [Member] 4.70 Percent Senior Notes Due Two Thousand and Twenty Six [Member] Cost of sales: Cost of Goods and Services Sold [Abstract] Litigation Status [Domain] Litigation Status [Domain] Fair Value By Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Treasury stock, at cost, 38.0 shares, at March 31, 2021 and December 31, 2020 Treasury Stock, Value Balance at beginning of year Balance at end of period Contract with Customer, Asset, after Allowance for Credit Loss 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. Earnings Per Share Earnings Per Share [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Equipment Equipment [Member] Current Liabilities Liabilities, Current [Abstract] 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] Financing Activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Entity Shell Company Entity Shell Company Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] 2023 Finance Lease, Liability, to be Paid, Year Two Thereafter Lessee, Operating Lease, Liability, Payments, Due after Year Four Lessee, Operating Lease, Liability, Payments, Due after Year Four Foreign currency impact/other Standard and Extended Product Warranty Accrual, Foreign Currency Translation Gain (Loss) Accounting Standards Recently Adopted New Accounting Pronouncements, Policy [Policy Text Block] Leverage ratio Debt Instrument, Restrictive Covenants, Leverage Ratio, Maximum Debt Instrument, Restrictive Covenants, Leverage Ratio, Maximum Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Basic Earnings Per Share, Basic [Abstract]