Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 310.2	$ 471.0	$ 252.7
Available-for-sale debt securities:
Change in net unrealized gains and losses	7.1	(6.5)	(5.0)
Net realized losses (gains) reclassified into net income	0.0	0.4	(1.2)
Net change on available-for-sale debt securities	7.1	(6.1)	(6.2)
Cash flow hedges:
Change in net unrealized gains and losses	11.7	15.7	(13.5)
Net realized losses (gains) reclassified into net income	29.1	26.8	(25.2)
Net change on cash flow hedges	40.8	42.5	(38.7)
Change in foreign currency translation adjustments	(3.0)	(30.1)	(12.8)
Other comprehensive income (loss), net	44.9	6.3	(57.7)
Comprehensive income	$ 355.1	$ 477.3	$ 195.0