CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 304.9	$ 77.7	$ 461.1	$ 123.9
Other comprehensive income (loss), net of tax:
Gain (loss) on cash flow hedges, net of tax (expense) benefit of ($0.1), $0.5, ($0.7), and $2.3, respectively	0.2	(1.4)	2.0	(6.5)
Comprehensive income	$ 305.1	$ 76.3	$ 463.1	$ 117.4