Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
AOCI, Net of Tax [Roll Forward]
Beginning balance	$ 8,686.8	$ 6,085.2	$ 4,435.2
Other comprehensive income (loss) before reclassifications	60.9	(69.4)	22.8
Amounts reclassified from accumulated other comprehensive income (loss)	23.5	2.9	(25.5)
Total other comprehensive income (loss)	84.4	(66.5)	(2.7)
Ending balance	10,100.0	8,686.8	6,085.2
Foreign Currency Translation Adjustment
AOCI, Net of Tax [Roll Forward]
Beginning balance	(15.6)	(0.9)	(11.2)
Other comprehensive income (loss) before reclassifications	2.0	(14.7)	10.3
Amounts reclassified from accumulated other comprehensive income (loss)	0.0	0.0	0.0
Total other comprehensive income (loss)	2.0	(14.7)	10.3
Ending balance	(13.6)	(15.6)	(0.9)
On Available-For-Sale Debt Securities
AOCI, Net of Tax [Roll Forward]
Beginning balance	0.3	0.5	(0.5)
Other comprehensive income (loss) before reclassifications	(0.8)	(0.2)	1.0
Amounts reclassified from accumulated other comprehensive income (loss)	0.0	0.0	0.0
Total other comprehensive income (loss)	(0.8)	(0.2)	1.0
Ending balance	(0.5)	0.3	0.5
On Foreign Currency Forward Contracts
AOCI, Net of Tax [Roll Forward]
Beginning balance	(53.2)	(1.6)	12.4
Other comprehensive income (loss) before reclassifications	59.7	(54.5)	11.5
Amounts reclassified from accumulated other comprehensive income (loss)	23.5	2.9	(25.5)
Total other comprehensive income (loss)	83.2	(51.6)	(14.0)
Ending balance	30.0	(53.2)	(1.6)
Total
AOCI, Net of Tax [Roll Forward]
Beginning balance	(68.5)	(2.0)	0.7
Total other comprehensive income (loss)	84.4	(66.5)	(2.7)
Ending balance	$ 15.9	$ (68.5)	$ (2.0)