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Stock-Based Compensation (Details 2) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2010
Shares      
Number of share options granted during the period (in shares) 400,000 700,000  
Stock Options
      
Shares      
Options outstanding at the beginning of the period (in shares) 7,400,000 7,500,000  
Number of share options granted during the period (in shares) 400,000 700,000 1,000,000
Exercised (in shares) (600,000) (700,000)  
Cancelled (in shares) (200,000) (100,000)  
Options outstanding at the end of the period (in shares) 7,000,000 7,400,000  
Options exercisable (in shares) 4,800,000    
Weighted Average Exercise Price      
Options outstanding at the beginning of the period (in dollars per share) $ 15.27 $ 14.44  
Granted (in dollars per share) $ 18.14 $ 16.27  
Exercised (in dollars per share) $ 8.35 $ 6.53  
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price $ 16.66 $ 20.53  
Options outstanding at the end of the period (in dollars per share) $ 16.00 $ 15.27  
Options exercisable (in dollars per share) $ 16.95    
Aggregate Intrinsic Value      
Options outstanding (in dollars) $ 62.5    
Options exercisable (in dollars) $ 41.8