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Debt (Details 3) (USD $)
In Millions, unless otherwise specified
6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2013
note
Dec. 31, 2012
Jun. 30, 2013
Interest rate cap contracts
Dec. 31, 2012
Interest rate cap contracts
Jun. 30, 2013
12-month period commencing October 15, 2017
Jun. 30, 2013
12-month period commencing October 15,2018
Jun. 30, 2013
12-month period commencing October 15,2019
Jun. 30, 2013
12-month period commencing October 15,2020 and thereafter
Jun. 30, 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
Jun. 30, 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
Jun. 30, 2013
Senior notes 8.50% due 2020
12-month period commencing November 1, 2015
Jun. 30, 2013
Senior notes 8.50% due 2020
12-month period commencing November 1, 2016
Jun. 30, 2013
Senior notes 8.50% due 2020
12-month period commencing November 1, 2017
Jun. 30, 2013
Senior notes 8.50% due 2020
12-month period commencing November 1, 2018 and thereafter
Jun. 30, 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
Jun. 30, 2013
Senior Notes 9.50% due 2018
12-month period commencing February 15, 2014
Jun. 30, 2013
Senior Notes 9.50% due 2018
12-month period commencing February 15, 2015
Jun. 30, 2013
Senior Notes 9.50% due 2018
12-month period commencing February 15, 2016 and thereafter
Jun. 30, 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 1,897.1 1,824.8             291.6 298.9   616.7 621.2           409.5 410.5         88.5 81.3
Weighted average interest rate (as a percent)                                                 6.50%  
Notional Amount of Interest Rate Cash Flow Hedge Derivatives     $ 225.0 $ 225.0                                            
Cap on interest rate (as a percent)     3.00%                                              
Derivative, Description of Variable Rate Basis     LIBOR                                              
Derivative, Fixed Interest Rate                 5.20%     8.31%