STOCKHOLDERS' EQUITY - Components of Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 14,796.5	$ 11,959.7	$ 13,397.3	$ 11,112.6
Other comprehensive income	36.9	23.1	25.0	105.0
Ending balance	15,677.5	12,623.5	15,677.5	12,623.5
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(23.5)	(79.8)	(12.2)	(162.5)
Other comprehensive income (loss) before reclassifications	36.4	21.0	19.8	106.0
Amounts reclassified from accumulated other comprehensive income (loss)	0.0	2.3	5.3	0.0
Other comprehensive income	36.4	23.3	25.1	106.0
Ending balance	12.9	(56.5)	12.9	(56.5)
Gains (Losses) on Hedge Instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	7.9	5.6	(2.5)	(2.9)
Other comprehensive income (loss) before reclassifications	(15.7)	2.0	(10.5)	12.6
Amounts reclassified from accumulated other comprehensive income (loss)	0.2	2.3	5.4	0.2
Other comprehensive income	(15.5)	4.3	(5.1)	12.8
Ending balance	(7.6)	9.9	(7.6)	9.9
Unrealized Gains (Losses) on Available-for-Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(28.4)	(103.5)	(29.7)	(154.2)
Other comprehensive income (loss) before reclassifications	59.5	25.6	60.6	76.5
Amounts reclassified from accumulated other comprehensive income (loss)	0.0	0.0	0.2	(0.2)
Other comprehensive income	59.5	25.6	60.8	76.3
Ending balance	31.1	(77.9)	31.1	(77.9)
Foreign Currency Translation Losses
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(3.5)	16.9	19.4	(6.6)
Other comprehensive income (loss) before reclassifications	(7.4)	(6.6)	(30.3)	16.9
Amounts reclassified from accumulated other comprehensive income (loss)	0.0	0.0	0.0	0.0
Other comprehensive income	(7.4)	(6.6)	(30.3)	16.9
Ending balance	(10.9)	10.3	(10.9)	10.3
Employee Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	0.5	1.2	0.6	1.2
Other comprehensive income (loss) before reclassifications	0.0	0.0	0.0	0.0
Amounts reclassified from accumulated other comprehensive income (loss)	(0.2)	0.0	(0.3)	0.0
Other comprehensive income	(0.2)	0.0	(0.3)	0.0
Ending balance	$ 0.3	$ 1.2	$ 0.3	$ 1.2