Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 1,082.9	$ 1,045.4	$ 2,762.1	$ (1,448.6)
Other comprehensive income (loss):
Unrealized holding gains on available-for-sale debt securities, net of tax of $(1.0), $(18.3), $(7.7) and $(11.4), respectively	3.5	66.7	27.4	41.6
Unrealized gains (losses) on foreign currency forward contracts, net of tax of $(9.4), $17.3, $70.3 and $1.8, respectively	33.5	(63.0)	(248.7)	(6.7)
Foreign currency translation adjustment	(0.4)	2.6	29.0	8.2
Total other comprehensive income (loss)	36.6	6.3	(192.3)	43.1
Comprehensive income (loss)	$ 1,119.5	$ 1,051.7	$ 2,569.8	$ (1,405.5)