Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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Represents the minimum percentage of the original principal amount of the debt instrument that must remain outstanding after the entity has redeemed a portion of the debt instrument with net cash proceeds from qualified equity offerings.

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Represents the number of series of senior notes outstanding.

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Debt Instrument, Price Percentage on Notes that are Required to be Offered for Repurchase

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Represents the maximum redemption period for the entity to redeem the debt instrument following the receipt of net proceeds from qualified equity offerings.

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Represents the redemption price of the debt instrument as a percentage of the principal amount if redeemed with net proceeds from qualified equity offerings.

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Represents the maximum percentage of the original principal amount of the debt instruments that the entity may redeem with net cash proceeds from qualified equity offerings.

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Debt redemption premium

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Derivative, Fixed Interest Rate Plus Applicable Spread Based on the consolidated total leverage ratio of the Company as defined under the New Senior Credit Facility

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Repayments of Long-term Debt including Redemption Premium

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Represents the minimum percentage of the principal amount outstanding on the Senior Notes which entitles the holders to declare the debt instrument due and payable immediately in the event of default.

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Weighted average interest rate of debt outstanding.

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Fixed interest rate related to the interest rate derivative.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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Debt (Details 3) (USD $)	3 Months Ended		2 Months Ended
Debt (Details 3) (USD $)	Mar. 31, 2015 note	Mar. 31, 2014	Feb. 18, 2014	Dec. 31, 2014	Oct. 19, 2012	Oct. 18, 2010	Feb. 03, 2010	May 13, 2011
Debt:
Number of Senior Notes outstanding	2
Proceeds from long-term debt	$ 1,000,000	$ 580,600,000
Event of default, minimum percentage of Senior Notes held required to declare debt due and payable (as a percent)	25.00%
Loss on debt extinguishment	0	(25,300,000)
Carrying amount	1,674,200,000us-gaap_DebtAndCapitalLeaseObligations			1,523,500,000us-gaap_DebtAndCapitalLeaseObligations
Senior notes 5.875% due 2022
Debt:
Interest rate, stated percentage (as a percent)					5.875%
Face amount of debt					300,000,000
Maximum percentage of the principal amount of the debt instrument which the entity may redeem with proceeds from qualified equity offerings (as a percent)	35.00%
Redemption price of debt instrument if redeemed with proceeds from qualified equity offerings (as a percent)	105.875%
Minimum percentage of the principal amount of the debt instrument which must remain outstanding after the entity has redeemed a portion of the debt instrument with proceeds from qualified equity offerings (as a percent)	65.00%
Maximum redemption period for the entity to redeem the debt instrument following the receipt of proceeds from qualified equity offerings (in number of days)	90 days
Debt Instrument, Price Percentage on Notes that are Required to be Offered for Repurchase	101.00%
Carrying amount	299,100,000			296,900,000
Senior notes 8.50% due 2020
Debt:
Interest rate, stated percentage (as a percent)						8.50%
Face amount of debt						600,000,000
Carrying amount	615,200,000			614,800,000
Senior notes 8.50% due 2020 \| 12-month period commencing November 1, 2015
Debt:
Debt Instrument, Redemption Price, Percentage	104.25%
Senior notes 8.50% due 2020 \| 12-month period commencing November 1, 2016
Debt:
Debt Instrument, Redemption Price, Percentage	102.833%
Senior notes 8.50% due 2020 \| 12-month period commencing November 1, 2017
Debt:
Debt Instrument, Redemption Price, Percentage	101.417%
Senior notes 8.50% due 2020 \| 12-month period commencing November 1, 2018 and thereafter
Debt:
Debt Instrument, Redemption Price, Percentage	100.00%
Senior Notes 9.50% due 2018
Debt:
Interest rate, stated percentage (as a percent)							9.50%
Debt Instrument, Redemption Price, Percentage			104.75%
Repayments of Long-term Debt including Redemption Premium			419,000,000
Loss on debt extinguishment		23,300,000
Debt redemption premium		19,000,000
Write off of Deferred Debt Issuance Cost		4,300,000
Amortization of Debt Discount (Premium)		8,300,000
Other
Debt:
Carrying amount	83,900,000			106,400,000
Weighted average interest rate (as a percent)	5.60%
Term Loan A [Member]
Debt:
Carrying amount	332,500,000			336,900,000
Senior Notes, Due 2022 [Member] \| 12-month period commencing October 15, 2017
Debt:
Debt Instrument, Redemption Price, Percentage	102.938%
Senior Notes, Due 2022 [Member] \| 12-month period commencing October 15,2018
Debt:
Debt Instrument, Redemption Price, Percentage	101.958%
Senior Notes, Due 2022 [Member] \| 12-month period commencing October 15,2019
Debt:
Debt Instrument, Redemption Price, Percentage	100.979%
Senior Notes, Due 2022 [Member] \| 12-month period commencing October 15,2020 and thereafter
Debt:
Debt Instrument, Redemption Price, Percentage	100.00%
Cash Flow Hedging [Member] \| Term Loan A [Member]
Debt:
Derivative, Notional Amount	175,000,000			175,000,000
Derivative, Fixed Interest Rate Plus Applicable Spread	1.635%
Fair Value Hedging [Member] \| Senior Notes, Due 2020 [Member]
Debt:
Derivative, Notional Amount	75,000,000			75,000,000
Derivative, Fixed Interest Rate	8.31%
Fair Value Hedging [Member] \| Senior Notes, Due 2022 [Member]
Debt:
Derivative, Notional Amount	125,000,000			125,000,000
Derivative, Fixed Interest Rate	5.186%
Prior Senior Credit Facility \| Term Loan A [Member]
Debt:
Face amount of debt								$ 350,000,000
Weighted average interest rate (as a percent)	2.19%