CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net Income	$ 220.7	$ 229.8
Other comprehensive income, net of tax:
Foreign exchange translation adjustments	(0.6)	(13.0)
Defined benefit plan adjustments gain (loss)	(0.7)	(0.0)
Income (loss) from derivative agreements	24.3	(19.7)
Other comprehensive income (loss)	23.0	(32.7)
Comprehensive income	$ 243.7	$ 197.1