Long-Term Debt -Senior Notes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Mar. 03, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Net loss on extinguishments of long-term debt	$ 0.0	$ (45.8)	$ (24.3)	$ (53.8)
Debt, short-term and long-term	3,268.3		3,268.3			$ 3,177.0
Deferred financing costs, net	28.0		28.0			26.4
Deferred Finance Costs, Net	$ 28.0		28.0			26.4
Senior notes due 2019 [Member]
Debt Instrument [Line Items]
Net loss on extinguishments of long-term debt			$ 24.3
Long-term Debt, stated interest rate	8.50%		8.50%
Debt, short-term and long-term	$ 0.0		$ 0.0			$ 503.9
Long-term Debt, Weighted Average Interest Rate						8.50%
Premium, unamortized						$ 1.3
Deferred Finance Costs, Net						4.4
Debt Instrument, Repurchased Face Amount					$ 503.9
Redemption Premium, percentage of par value					104.25%
Extinguishment of Debt, Fees Paid to Lenders			21.4
Write off of Deferred Debt Issuance Cost			4.2
Write off of Deferred Debt issuance Cost, unamortized premium			$ 1.3
Senior Notes due 2023 [Member]
Debt Instrument [Line Items]
Long-term Debt, stated interest rate	5.00%		5.00%
Debt, short-term and long-term	$ 525.0		$ 525.0
Deferred financing costs, net	$ 6.8		$ 6.8
Long-term Debt, Weighted Average Interest Rate	5.00%		5.00%
Deferred Finance Costs, Net	$ 6.4		$ 6.4
Term Loan [Member]
Debt Instrument [Line Items]
Debt, short-term and long-term	$ 1,502.0		$ 1,502.0			$ 1,513.5
Long-term Debt, Weighted Average Interest Rate	3.25%		3.25%			3.25%