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Long-term Debt (Details Textual) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Jun. 15, 2011
May 10, 2011
Mar. 07, 2011
Dec. 31, 2010
Jun. 30, 2011
Line of Credit [Member]
Jun. 30, 2011
7.25% Senior Notes due 2018 [Member]
Mar. 07, 2011
7.25% Senior Notes due 2018 [Member]
Jun. 30, 2011
7.75% Senior Notes due 2022 [Member]
Mar. 07, 2011
7.75% Senior Notes due 2022 [Member]
Jun. 15, 2011
7.25% Senior Notes due 2018 and 7.75% Senior Notes due 2022 [Member]
Sep. 30, 2011
10.75% Senior Notes due 2016 [Member]
Jun. 30, 2011
10.75% Senior Notes due 2016 [Member]
Jun. 15, 2011
10.75% Senior Notes due 2016 [Member]
May 10, 2011
Term loan facility [Member]
Jun. 30, 2011
2011 Credit Agreement [Member]
May 10, 2011
2011 Credit Agreement [Member]
Long Term Debt (Textuals)                                        
Public offering of senior notes             $ 120       $ 60   $ 60              
Issue Price of Senior Notes                     103.25%   103.50%              
Net Proceeds From Public Offering of Senior Notes             122                          
Amount of proceeds used to Repay outstanding amount under revolving credit facility                 45                      
Senior Notes Stated Interest Rate                   7.25%   7.75%       10.75%        
Term loan maturing in 2016 100.0   100.0         0                   100.0    
Initial Interest Rate           LIBOR plus 2.5%                            
Maximum future increases of credit agreement                                       200
Reduction In Contractual Interest Rates of Credit Agreement                                       100 basis points
Maximum Amount Under Senior Secured Revolving Credit Facility                                     500  
Letter of credit subfacility                                     260  
Percentage of term loan to be Amortized through June 30, 2013                                     5.00%  
Percentage of term loan to be Amortized through June 30, 2014                                     7.50%  
Percentage of term loan to be Amortized through March 31, 2016                                     10.00%  
Debt Extinguishment Senior Notes         335                              
Current Call Price of 10.75% Senior Notes Due 2016     105.375%                                  
Total Cash Paid to Call 10.75% Senior Notes Due 2016         353                              
Amount draw on our revolving credit facility to fund optional redemption                                 150      
Amount of cash on hand used to fund optional redemption                                 203      
Proceeds from the term loan used to fund optional redemption                                 100.0      
Remaining Proceeds from Add-on Issuance of Senior Notes Used to Fund Optional Redemption                           77            
Loss on early extinguishment of debt $ 26.1 $ 0.1 $ 26.1 $ 0.4                     $ 13.0