Consolidated Statements Of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 134.2	$ (5.4)
Other comprehensive income, net of tax:
Foreign currency translation adjustments	(15.6)	(25.1)
Unrealized gain (loss) on derivative instruments	1.4	(10.3)
Retirement plan and other activity	0.1	0.1
Comprehensive income (loss)	120.1	(40.7)
Comprehensive (income) loss attributable to noncontrolling interest	(0.1)	0.0
Comprehensive income (loss)	$ 120.0	$ (40.7)