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Debt (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended						3 Months Ended							3 Months Ended			3 Months Ended							3 Months Ended
	Mar. 31, 2013 note	Sep. 30, 2012	Sep. 30, 2010	Dec. 31, 2012	Mar. 31, 2013 Interest rate cap contracts	Dec. 31, 2012 Interest rate cap contracts	Mar. 31, 2013 12-month period commencing October 15, 2017	Mar. 31, 2013 12-month period commencing October 15,2018	Mar. 31, 2013 12-month period commencing October 15,2019	Mar. 31, 2013 12-month period commencing October 15,2020 and thereafter	Mar. 31, 2013 Senior notes 5.875% due 2022	Dec. 31, 2012 Senior notes 5.875% due 2022	Oct. 19, 2012 Senior notes 5.875% due 2022	Mar. 31, 2013 Senior notes 8.50% due 2020	Dec. 31, 2012 Senior notes 8.50% due 2020	Oct. 18, 2010 Senior notes 8.50% due 2020	Mar. 31, 2013 Senior notes 8.50% due 2020 12-month period commencing November 1, 2015	Mar. 31, 2013 Senior notes 8.50% due 2020 12-month period commencing November 1, 2016	Mar. 31, 2013 Senior notes 8.50% due 2020 12-month period commencing November 1, 2017	Mar. 31, 2013 Senior notes 8.50% due 2020 12-month period commencing November 1, 2018 and thereafter	Mar. 31, 2013 Senior Notes 9.50% due 2018	Dec. 31, 2012 Senior Notes 9.50% due 2018	Feb. 03, 2010 Senior Notes 9.50% due 2018	Mar. 31, 2013 Senior Notes 9.50% due 2018 12-month period commencing February 15, 2014	Mar. 31, 2013 Senior Notes 9.50% due 2018 12-month period commencing February 15, 2015	Mar. 31, 2013 Senior Notes 9.50% due 2018 12-month period commencing February 15, 2016 and thereafter	Mar. 31, 2013 Other	Dec. 31, 2012 Other
Debt:
Number of Senior Notes outstanding	3
Interest rate, stated percentage (as a percent)													5.875%			8.50%							9.50%
Face amount of debt													$ 300.0			$ 600.0							$ 400.0
Event of default, minimum percentage of Senior Notes held required to declare debt due and payable (as a percent)	25.00%
Debt Instrument, Redemption Price, Percentage							102.938%	101.958%	100.979%	100.00%							104.25%	102.833%	101.417%	100.00%				104.75%	102.375%	100.00%
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%							35.00%
Redemption price of debt instrument if redeemed with proceeds from qualified equity offerings (as a percent)											105.875%			108.50%							109.50%
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%							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			90 days							90 days
Debt Instrument, Price Percentage on Notes that are Required to be Offered for Repurchase											101.00%
Carrying amount	1,952.7			1,824.8							297.6	298.9		620.5	621.2						410.0	410.5					88.5	81.3
Weighted average interest rate (as a percent)																											6.60%
Notional Amount of Interest Rate Cash Flow Hedge Derivatives					225.0	225.0
Derivative, Fixed Interest Rate											5.35%
Proceeds from swap monetization		$ 14.8	$ 21.5

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- Definition

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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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

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Interest rate stated in the contractual debt agreement.

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