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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 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Numerator        
Net income attributable to Wabtec shareholders $ 166.0 $ 125.0 $ 315.0 $ 237.0
Denominator        
Weighted average shares outstanding- basic (in shares) 181.9 188.6 183.2 188.5
Assumed conversion of dilutive stock-based compensation plans (in shares) 0.5 0.3 0.5 0.4
Weighted average shares outstanding- diluted (in shares) 182.4 188.9 183.7 188.9
Net income attributable to Wabtec shareholders per common share        
Basic (in dollars per share) $ 0.91 $ 0.66 $ 1.71 $ 1.25
Diluted (in dollars per share) $ 0.91 $ 0.66 $ 1.71 $ 1.25