CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income attributable to Wabtec shareholders	$ 326.7	$ 294.9	$ 262.3
Foreign currency translation (loss) gain	(106.4)	(207.3)	326.1
Unrealized (loss) gain on derivative contracts	(4.3)	(5.3)	9.8
Unrealized (loss) gain on pension benefit plans and post-retirement benefit plans	(21.5)	(3.8)	2.8
Other comprehensive (loss) gain before tax	(132.2)	(216.4)	338.7
Income tax benefit (expense) related to components of other comprehensive loss	6.2	4.8	(4.1)
Other comprehensive (loss) income, net of tax	(126.0)	(211.6)	334.6
Comprehensive income attributable to Wabtec shareholders	$ 200.7	$ 83.3	$ 596.9