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Consolidated Statements of Comprehensive Loss - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net loss	$ (484.9)	$ (111.7)	$ (210.2)
Other comprehensive income (loss), net of tax:
Change in foreign currency translation adjustments	(4.9)	5.2	(1.3)
Change in net unrealized losses on short-term investments	(0.5)	0.0	0.0
Total other comprehensive income (loss), net of tax	(5.4)	5.2	(1.3)
Comprehensive loss	$ (490.3)	$ (106.5)	$ (211.5)

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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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