CONSOLIDATED STATEMENT OF STOCKHOLDERS' DEFICIENCY - USD ($) $ in Millions		3 Months Ended				12 Months Ended
		Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			$ (506.8)		$ (491.6)	$ (506.8)	$ (491.6)		$ (557.0)
Stock-based compensation amortization						6.8	6.4		5.1
Excess tax benefits from stock-based compensation							0.5		0.3
Net (loss) income		$ (77.1)	(35.8)	$ (34.8)	13.0	(178.7)	(15.7)	[1]	62.1	[1]
Other comprehensive income	[2]					23.3	(6.4)		(2.1)
Ending balance		(655.4)		(506.8)		(655.4)	(506.8)		(491.6)
RCPC Preferred Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			54.6		54.6	54.6	54.6		54.6
Ending balance		54.6		54.6		54.6	54.6		54.6
Additional Paid-In Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			964.4		957.5	964.4	957.5		952.1
Stock-based compensation amortization						6.8	6.4		5.1
Excess tax benefits from stock-based compensation							0.5		0.3
Ending balance		971.2		964.4		971.2	964.4		957.5
Accumulated Deficit
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			(1,274.1)		(1,258.4)	(1,274.1)	(1,258.4)		(1,320.5)
Net (loss) income						(178.7)	(15.7)		62.1
Ending balance		(1,452.8)		(1,274.1)		(1,452.8)	(1,274.1)		(1,258.4)
Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			$ (251.7)		$ (245.3)	(251.7)	(245.3)		(243.2)
Other comprehensive income	[2]					23.3	(6.4)		(2.1)
Ending balance		$ (228.4)		$ (251.7)		$ (228.4)	$ (251.7)		$ (245.3)

[1] Adjusted as a result of the adoption of certain accounting pronouncements beginning on January 1, 2017. See Note 1, "Description of Business and Summaryof Significant Accounting Policies - Recently Adopted Accounting Pronouncements," for details of these adjustments.

[2] See Note 17, "Accumulated Other Comprehensive Loss," regarding the changes in the accumulated balances for each component of other comprehensive loss during 2017, 2016 and 2015.