Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 16,409.6	$ 17,580.4
Other comprehensive income (loss) before reclassifications	(39.1)	33.5
Amounts reclassified from accumulated other comprehensive income (loss)	(20.6)	(1.9)
Total other comprehensive (loss) income	(59.7)	31.6
Ending balance	16,496.3	18,546.6
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	127.8	(14.3)
Total other comprehensive (loss) income	(59.7)	31.6
Ending balance	68.1	17.3
Foreign Currency Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	9.7	1.1
Other comprehensive income (loss) before reclassifications	14.1	6.8
Amounts reclassified from accumulated other comprehensive income (loss)	0.0	0.0
Total other comprehensive (loss) income	14.1	6.8
Ending balance	23.8	7.9
On Available-For-Sale Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	7.1	9.6
Other comprehensive income (loss) before reclassifications	18.3	(20.5)
Amounts reclassified from accumulated other comprehensive income (loss)	(1.8)	0.8
Total other comprehensive (loss) income	16.5	(19.7)
Ending balance	23.6	(10.1)
On Foreign Currency Forward Contracts
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	111.0	(25.0)
Other comprehensive income (loss) before reclassifications	(71.5)	47.2
Amounts reclassified from accumulated other comprehensive income (loss)	(18.8)	(2.7)
Total other comprehensive (loss) income	(90.3)	44.5
Ending balance	$ 20.7	$ 19.5