UNAUDITED CONSOLIDATED STATEMENT OF STOCKHOLDERS' DEFICIENCY - USD ($) $ in Millions		3 Months Ended	9 Months Ended
		Sep. 30, 2018	Sep. 30, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			$ (655.4)
Stock-based compensation amortization			14.8
Net (loss) income		$ (9.9)	(220.0)
Other comprehensive income (loss), net		(2.6)	(5.1)	[1]
Ending balance		(865.7)	(865.7)
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			14.8
Ending balance		986.0	986.0
Accumulated Deficit
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			(1,452.8)
Net (loss) income			(220.0)
Ending balance		(1,672.8)	(1,672.8)
Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			(228.4)
Other comprehensive income (loss), net	[1]		(5.1)
Ending balance		$ (233.5)	$ (233.5)

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