Debt (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
	Mar. 31, 2015	Jun. 30, 2015	Dec. 31, 2014
Debt, Long-term and Short-term, Combined Amount		$ 2,223.3	$ 2,015.8
Debt payable—unconsolidated affiliate		31.6	31.5
Deferred payment obligation		28.7	28.2
Less debt payable within one year		(76.8)	(96.8)
Debt payable after one year		$ 2,146.5	$ 1,919.0
Weighted average interest rates on total debt		4.20%	4.30%
Maturities of Long-term Debt [Abstract]
Long-term Debt, Current Maturities		$ 36.0
Long-term Debt, Maturing in Year Two		49.4
Long-term Debt, Maturing in Year Three		44.9
Long-term Debt, Maturing in Year Four		15.8
Long-term Debt, Maturing in Year Five		15.1
Long-term Debt, Maturing Thereafter		2,062.1
Senior Secured Credit Facility to Fund Emergence	$ 250.0
Payments for Repurchase of Warrants	$ 490.0
Term Loan B (USD) [Member]
Debt Instrument, Unamortized Discount		$ 1.9	$ 2.1
Debt Instrument, Basis Spread on Variable Rate		2.00%	2.25%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum		0.75%	0.75%
Term Loan B (EUR) [Member]
Debt Instrument, Unamortized Discount		$ 0.4	$ 0.4
Debt Instrument, Basis Spread on Variable Rate		2.25%	2.50%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum		0.75%	0.75%
Other Debt Obligations [Member]
Debt, Long-term and Short-term, Combined Amount		$ 59.7	$ 82.3
Senior Notes, Due 2021 [Member]
Debt Instrument, Interest Rate, Stated Percentage		5.125%	5.125%
Senior Notes, Due 2024 [Member]
Debt Instrument, Interest Rate, Stated Percentage		5.625%	5.625%