Condensed Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net (loss) income	$ (14.0)	$ 42.4
Currency translation adjustments	(12.0)	(24.8)
Net unrealized pension and other benefit actuarial (losses) gains and prior service credits (net of tax)	(1.7)	0.9
Net unrealized losses on financial instruments (net of tax)	(5.4)	(12.7)
Total other comprehensive loss	(19.1)	(36.6)
Comprehensive (loss) income	$ (33.1)	$ 5.8