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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
Mar. 31, 2021
Mar. 31, 2020
Earnings Per Share Numerator Activity [Abstract]    
Net income attributable to Wabtec shareholders $ 112.4 $ 111.6
Less: dividends declared - common shares and non-vested restricted stock (23.0) (23.0)
Undistributed earnings $ 89.4 $ 88.6
Percentage allocated to common shareholders (as a percent) 99.80% 99.70%
Undistributed earnings allocated to common shareholders $ 89.2 $ 88.3
Add: dividends declared - common shares 22.9 22.9
Numerator for basic earnings per common share 112.1 111.2
Numerator for diluted earnings per common share $ 112.1 $ 111.2
Denominator    
Basic weighted average common shares outstanding (in shares) 188.5 190.8
Assumed conversion of dilutive stock-based compensation plans (in shares) 0.4 0.6
Denominator for diluted earnings per common share adjusted weighted average shares and assumed conversion (in shares) 188.9 191.4
Net income attributable to Wabtec shareholders per common share    
Basic (in dollars per share) $ 0.59 $ 0.58
Diluted (in dollars per share) $ 0.59 $ 0.58
Basic weighted-average common shares outstanding and non-vested restricted stock expected to vest (in shares) 188.9 191.4