UNAUDITED CONSOLIDATED STATEMENT OF STOCKHOLDER'S DEFICIENCY - USD ($) $ in Millions		3 Months Ended	6 Months Ended
		Jun. 30, 2018	Jun. 30, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			$ (655.4)
Stock-based compensation amortization			8.5
Net (loss) income		$ (121.1)	(210.1)
Other comprehensive (loss) income		(2.7)	(2.5)	[1]
Ending balance		(859.5)	(859.5)
Preferred Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			54.6
Ending balance		54.6	54.6
Additional Paid-In Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			971.2
Stock-based compensation amortization			8.5
Ending balance		979.7	979.7
Accumulated Deficit
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			(1,452.8)
Net (loss) income			(210.1)
Ending balance		(1,662.9)	(1,662.9)
Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			(228.4)
Other comprehensive (loss) income	[1]		(2.5)
Ending balance		$ (230.9)	$ (230.9)

[1] See Note 12, "Accumulated Other Comprehensive Loss," regarding the changes in the accumulated balances for each component of other comprehensive loss during the six months ended June 30, 2018.