Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net Income	$ 31.7	$ 306.6	$ 276.6
Currency translation adjustments	54.6	(2.6)	(45.5)
Net unrealized pension and other benefit actuarial (loss) gain and prior service credits (net of tax)	(18.0)	(7.0)	3.1
Net unrealized gain (loss) on financial instruments (net of tax)	22.5	(1.1)	(22.2)
Total other comprehensive income (loss)	59.1	(10.7)	(64.6)
Comprehensive income	$ 90.8	$ 295.9	$ 212.0