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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	$ 453.6	$ 553.2	$ 335.8
Other comprehensive income (loss):
Change in foreign currency translation adjustments	0.2	(7.1)	(0.6)
Change in net unrealized gains and (losses) on short-term investments	27.2	(39.2)	(12.9)
Total other comprehensive income (loss)	27.4	(46.3)	(13.5)
Comprehensive income	$ 481.0	$ 506.9	$ 322.3

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