Condensed Consolidated Statements of Comprehensive Income Statement - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 578.1	$ 467.6	$ 67.6	$ 1,515.3
Other comprehensive (loss) income, net of tax:
Foreign currency translation	1.2	(2.5)	(5.3)	(3.0)
Unrealized gains on debt securities	0.0	0.0	0.1	0.2
Unrealized (gains) losses on hedging activities, net of tax of $(2.8), $3.5, $(14.3) and $(10.8), respectively	(9.5)	12.2	(47.2)	(35.7)
Other comprehensive (loss) income, net of tax	(8.3)	9.7	(52.4)	(38.5)
Comprehensive income	$ 569.8	$ 477.3	$ 15.2	$ 1,476.8