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Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 48.6	$ 97.3
Other comprehensive income (loss), net of tax:
Translation adjustments and other	1.4	(1.4)
Unrealized gain (loss) on marketable debt securities	3.7	(5.2)
Total other comprehensive income (loss), net of tax	5.1	(6.6)
Comprehensive income	$ 53.7	$ 90.7

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