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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 40.3	$ 19.9
Other comprehensive income (loss), net of tax:
Translation adjustments and other	(0.3)	(0.7)
Unrealized gain on marketable debt securities	0.0	2.1
Total other comprehensive income (loss), net of tax	(0.3)	1.4
Comprehensive income	$ 40.0	$ 21.3

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