Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 17,580.4	$ 13,912.7
Other comprehensive income (loss) before reclassifications	33.5	3.3
Amounts reclassified from accumulated other comprehensive income (loss)	(1.9)	(17.2)
Total other comprehensive income (loss)	31.6	(13.9)
Ending balance	18,546.6	14,432.3
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(14.3)	0.8
Total other comprehensive income (loss)	31.6	(13.9)
Ending balance	17.3	(13.1)
Foreign Currency Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	1.1	(25.0)
Other comprehensive income (loss) before reclassifications	6.8	10.0
Amounts reclassified from accumulated other comprehensive income (loss)	0.0	0.0
Total other comprehensive income (loss)	6.8	10.0
Ending balance	7.9	(15.0)
On Available-For-Sale Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	9.6	(0.1)
Other comprehensive income (loss) before reclassifications	(20.5)	2.9
Amounts reclassified from accumulated other comprehensive income (loss)	0.8	0.0
Total other comprehensive income (loss)	(19.7)	2.9
Ending balance	(10.1)	2.8
On Foreign Currency Forward Contracts
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(25.0)	25.9
Other comprehensive income (loss) before reclassifications	47.2	(9.6)
Amounts reclassified from accumulated other comprehensive income (loss)	(2.7)	(17.2)
Total other comprehensive income (loss)	44.5	(26.8)
Ending balance	$ 19.5	$ (0.9)