Long-Term Debt -Senior Notes (Details) (USD $)	3 Months Ended		9 Months Ended							3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2014 Senior Notes due 2022 [Member]		Dec. 31, 2013 Senior Notes due 2022 [Member]	Aug. 05, 2014 Senior Notes [Member]	Sep. 30, 2014 Senior notes due 2019 [Member]		Sep. 30, 2014 Senior notes due 2019 [Member]		Aug. 05, 2014 Senior notes due 2019 [Member]	Mar. 20, 2014 Senior notes due 2019 [Member]	Dec. 31, 2013 Senior notes due 2019 [Member]
Debt Instrument [Line Items]
Extinguishment of Debt, Accrued Interest Paid to Lenders															$ 1,000,000
Net loss on extinguishments of long-term debt	(45,800,000)	(41,300,000)	(53,800,000)	(55,500,000)						22,100,000		2,700,000
Long-term Debt, stated interest rate						6.00%				8.50%		8.50%
Debt, short-term and long-term						600,000,000		0	600,000,000	1,045,300,000		1,045,300,000				1,305,000,000
Deferred financing costs, net	31,800,000		31,800,000		30,100,000	8,000,000
Long-term Debt, Weighted Average Interest Rate						6.00%	[1]			8.50%	[1]	8.50%	[1]
Premium, unamortized										2,900,000		2,900,000				4,200,000
Debt Instrument, Repurchased Face Amount														234,700,000	25,000,000
Redemption Premium, percentage of par value														108.80%	109.75%
Extinguishment of Debt, Fees Paid to Lenders										10,000,000		2,400,000
Extinguishment of Debt, Make-whole Interest Payment										10,600,000
Write off of Deferred Debt Issuance Cost										2,200,000		300,000
Write off of Deferred Debt issuance Cost, unamortized premium										700,000
Debt Instrument, Repurchase Amount														$ 234,700,000

[1] Interest rate at September 30, 2014