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ACQUISITIONS - Pro Forma Financial Information (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Business Combinations [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 8,675.6 | $ 8,030.5 |
Gross profit |  |  |  |  |  |  |  |  | 2,528.3 | 2,102.8 |
Net income attributable to Wabtec shareholders |  |  |  |  |  |  |  |  | $ 485.1 | $ 234.8 |
Diluted earnings per share |  |  |  |  |  |  |  |  |  |  |
As Reported (in dollars per share) | $ 0.71 | $ 0.48 | $ 0.54 | $ (0.04) | $ 0.36 | $ 0.91 | $ 0.87 | $ 0.92 | $ 1.84 | $ 3.05 | $ 2.72
Pro forma (in dollars per share) |  |  |  |  |  |  |  |  | $ 2.53 | $ 1.22 |

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