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

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Represents the number of series of senior notes outstanding.

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

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Debt (Details 3) $ in Millions	2 Months Ended	3 Months Ended			6 Months Ended
Debt (Details 3) $ in Millions	Feb. 18, 2014 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Jun. 30, 2015 USD ($) note	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)	Oct. 19, 2012 USD ($)	May. 13, 2011 USD ($)	Oct. 18, 2010 USD ($)	Feb. 03, 2010
Debt:
Number of Senior Notes outstanding \| note					2
Proceeds from long-term debt					$ 1.8	$ 611.7
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		$ 0.0	$ 0.0		$ 0.0	$ (25.3)
Carrying amount		$ 1,628.9			$ 1,628.9		$ 1,523.5
Senior notes 5.875% due 2022
Debt:
Interest rate, stated percentage (as a percent)								5.875%
Face amount of debt								$ 300.0
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%			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%			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		$ 297.7			$ 297.7		296.9
Senior notes 8.50% due 2020
Debt:
Interest rate, stated percentage (as a percent)										8.50%
Face amount of debt										$ 600.0
Carrying amount		614.4			$ 614.4		614.8
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	$ 419.0
Loss on debt extinguishment				$ 23.3
Debt redemption premium				19.0
Write off of Deferred Debt Issuance Cost				4.3
Amortization of Debt Discount (Premium)				$ 8.3
Other
Debt:
Carrying amount		$ 80.4			$ 80.4		106.4
Weighted average interest rate (as a percent)		5.70%			5.70%
Term Loan A [Member]
Debt:
Carrying amount		$ 325.9			$ 325.9		336.9
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		$ 175.0			$ 175.0		175.0
Derivative, Fixed Interest Rate Plus Applicable Spread		1.635%			1.635%
Fair Value Hedging [Member] \| Senior Notes, Due 2020 [Member]
Debt:
Derivative, Notional Amount		$ 0.0			$ 0.0		75.0
Fair Value Hedging [Member] \| Senior Notes, Due 2022 [Member]
Debt:
Derivative, Notional Amount		$ 80.0			$ 80.0		$ 125.0
Derivative, Fixed Interest Rate		5.46%			5.46%
Prior Senior Credit Facility \| Term Loan A [Member]
Debt:
Face amount of debt									$ 350.0
Weighted average interest rate (as a percent)		2.44%			2.44%