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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

X

- Definition

The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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