CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 220.3	$ 199.7
Foreign currency translation	(2.1)	(5.3)
Unrealized (loss) gain on available-for-sale debt securities, net of tax	(0.9)	0.3
Comprehensive income	$ 217.3	$ 194.7