CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss) attributable to Wabtec shareholders	$ 111.6	$ (4.5)
Foreign currency translation loss	(181.4)	(46.6)
Unrealized gain (loss) on derivative contracts	8.1	(4.1)
Unrealized loss on pension benefit plans and post-retirement benefit plans	(3.6)	(3.6)
Other comprehensive loss before tax	(176.9)	(54.3)
Income tax (benefit) expense related to components of other comprehensive income	(1.1)	1.9
Other comprehensive loss, net of tax	(178.0)	(52.4)
Comprehensive loss attributable to Wabtec shareholders	$ (66.4)	$ (56.9)