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EARNINGS PER SHARE - Computation of Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Numerator        
Net income attributable to Wabtec shareholders $ 160.0 $ 131.0 $ 475.0 $ 368.0
Denominator        
Weighted average shares outstanding- basic (in shares) 181.3 187.6 182.6 188.2
Assumed conversion of dilutive stock-based compensation plans (in shares) 0.6 0.4 0.5 0.4
Weighted average shares outstanding- diluted (in shares) 181.9 188.0 183.1 188.6
Net income attributable to Wabtec shareholders per common share        
Basic (in dollars per share) $ 0.88 $ 0.69 $ 2.60 $ 1.95
Diluted (in dollars per share) $ 0.88 $ 0.69 $ 2.59 $ 1.95