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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 72.2	$ 45.8	$ 138.4	$ 8.4
Other comprehensive income (loss), net of tax:
Translation adjustments and other	0.4	(0.9)	0.2	(1.0)
Unrealized gain (loss) on marketable debt securities	(1.1)	(0.1)	0.3	0.5
Total other comprehensive income (loss), net of tax	(0.7)	(1.0)	0.5	(0.5)
Comprehensive income	$ 71.5	$ 44.8	$ 138.9	$ 7.9

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