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ACQUISITIONS - Pro Forma Financial Information (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Business Combination and Asset Acquisition [Abstract] |  |  |
Net sales |  |  | $ 8,676
Gross profit |  |  | 2,343
Net income attributable to Wabtec shareholders |  |  | $ 277
Diluted earnings per share |  |  |
As Reported (in dollars per share) | $ 2.96 | $ 2.17 | $ 1.84
Pro forma (in dollars per share) |  |  | $ 1.45

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