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ACQUISITIONS - Pro Forma Financial Information (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Business Combinations [Abstract] |  |  |
Net sales |  | $ 8,675.6 |
Gross profit |  | 2,343.3 |
Net income attributable to Wabtec shareholders |  | $ 277.2 |
Diluted earnings per share |  |  |
As Reported (in dollars per share) | $ 2.17 | $ 1.84 | $ 3.05
Pro forma (in dollars per share) |  | $ 1.45 |

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