CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net Income	$ 827.5	$ 785.9	$ 615.9
Other comprehensive income, net of tax:
Foreign exchange translation adjustments	(3.8)	10.4	5.7
Defined benefit plan loss	(0.6)	(0.0)	(0.9)
Income (loss) from derivative agreements	13.8	(21.3)	(17.9)
Other comprehensive income (loss)	9.4	(10.9)	(13.1)
Comprehensive income	$ 836.9	$ 775.0	$ 602.8