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ACQUISITIONS - Pro Forma Financial Information (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Business Combination and Asset Acquisition [Abstract]
Net sales			$ 8,676
Gross profit			2,343
Net income attributable to Wabtec shareholders			$ 277
Diluted earnings per share
As Reported (in dollars per share)	$ 2.96	$ 2.17	$ 1.84
Pro forma (in dollars per share)			$ 1.45

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- 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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