CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income attributable to Wabtec shareholders	$ 149.0	$ 112.0
Foreign currency translation gain (loss)	13.0	(62.0)
Unrealized gain (loss) on derivative contracts	3.0	(8.0)
Unrealized gain (loss) on pension benefit plans and post-retirement benefit plans	1.0	(3.0)
Other comprehensive income (loss) before tax	17.0	(73.0)
Income tax benefit related to components of Other comprehensive income (loss)	0.0	3.0
Other comprehensive income (loss), net of tax	17.0	(70.0)
Comprehensive income attributable to Wabtec shareholders	$ 166.0	$ 42.0