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Share-Based Compensation (Details 4) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Restricted Stock Award
     
Share-based compensation disclosures      
Vesting period of shares 4 years    
Unvested restricted stock      
Outstanding at the beginning of the period (in shares)) 1,556,000    
Granted (in shares) 944,000    
Vested (in shares) (503,000)    
Forfeited (in shares) (216,000)    
Outstanding at the end of the period (in shares) 1,781,000    
Weighted-Average Grant-Date Fair Value      
Outstanding at the end of the period (in dollars per share) $ 26.07    
Granted (in dollars per share) $ 20.69    
Vested (in dollars per share) $ 25.94    
Forfeited (in dollars per share) $ 24.66    
Outstanding at the beginning of the period (in dollars per share) $ 23.42    
Total future compensation cost related to unvested stock that are expected to vest $ 30.6    
Weighted Average Period for Cost recognition 1 year    
Restricted Stock Award | Employees and Director
     
Unvested restricted stock      
Granted (in shares) 944,015 1,096,379  
Weighted-Average Grant-Date Fair Value      
Aggregate value of restricted stock awards at date of grant 19.5 30.0  
Fair value of Restricted Stock Awarded to Employees and Directors that vested $ 9.7 $ 21.4 $ 26.7
Restricted Stock Award | Maximum
     
Share-based compensation disclosures      
Vesting period of shares 5 years    
Restricted Stock Award | Maximum | Employees and Director
     
Share-based compensation disclosures      
Vesting period of shares 4 years    
Stock options
     
Share-based compensation disclosures      
Vesting period of shares 10 years    
Stock options | Minimum
     
Share-based compensation disclosures      
Vesting period of shares 3 years    
Stock options | Maximum
     
Share-based compensation disclosures      
Vesting period of shares 5 years    
Stock options | Maximum | Employees and Director
     
Share-based compensation disclosures      
Vesting period of shares 4 years