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Consolidated Statements of Comprehensive Loss - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 19.9	$ (26.9)
Other comprehensive income, net of tax:
Translation adjustments and other	(0.7)	0.0
Unrealized gain on marketable debt securities	2.1	0.1
Total other comprehensive income, net of tax	1.4	0.1
Comprehensive income (loss)	$ 21.3	$ (26.8)

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