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Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 154.7	$ 493.6	$ 101.1
Other comprehensive income (loss), net of tax:
Translation adjustments and other	(1.0)	1.1	0.4
Unrealized gain (loss) on marketable debt securities	(1.7)	(0.2)	0.4
Total other comprehensive income (loss), net of tax	(2.7)	0.9	0.8
Comprehensive income	$ 152.0	$ 494.5	$ 101.9

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