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Acquisitions - Pro Forma Financial Information (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Business Combinations [Abstract]
Net sales	$ 1,737.4	$ 2,236.3	$ 3,667.3	$ 4,305.5
Gross profit	486.7	614.7	1,065.4	1,069.0
Net income attributable to Wabtec shareholders	$ 86.8	$ 104.1	$ 198.4	$ 50.4
Diluted earnings per share
Diluted (in dollars per share)	$ 0.46	$ 0.54	$ 1.04	$ 0.61
Pro forma (in dollars per share)	$ 0.46	$ 0.54	$ 1.04	$ 0.26

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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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