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Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net loss	$ (7.7)	$ (465.5)
Other comprehensive income (loss), net of tax:
Change in foreign currency translation adjustments	1.1	1.5
Change in net unrealized gains (losses) on short-term investments	1.9	(0.1)
Total other comprehensive income (loss), net of tax	3.0	1.4
Comprehensive loss	$ (4.7)	$ (464.1)

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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