CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net Income	$ 189.7	$ 138.5	$ 419.5	$ 314.2
Other comprehensive income, net of tax:
Foreign exchange translation adjustments	6.4	1.1	(6.6)	2.9
Income (loss) from derivative agreements	(5.3)	(10.0)	(25.0)	(17.7)
Other comprehensive income (loss)	1.1	(8.9)	(31.6)	(14.8)
Comprehensive income	$ 190.8	$ 129.6	$ 387.9	$ 299.4