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Acquisitions - Pro Forma Financial Information (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Business Combinations [Abstract]
Net sales				$ 6,307.2
Gross profit				1,668.4
Net income attributable to Wabtec shareholders				$ 141.5
Diluted earnings per share
Diluted (in dollars per share)	$ 0.67	$ 0.48	$ 1.71	$ 1.11
Pro forma (in dollars per share)				$ 0.74

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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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