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Stock-Based Compensation (Details 7) (USD $)
In Millions, except Per Share data, unless otherwise specified
 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Supplemental Employee Incentive Plan
tradingdays
Dec. 31, 2011
Supplemental Employee Incentive Plan
Dec. 31, 2010
Supplemental Employee Incentive Plan
Dec. 31, 2012
Supplemental Employee Incentive Plan
February 2013 Trigger Achievement
Dec. 31, 2012
Supplemental Employee Incentive Plan
Interim trigger date occurs by June 30, 2014
Feb. 28, 2013
Supplemental Employee Incentive Plan
Interim trigger date occurs by June 30, 2014
February 2013 Trigger Achievement
Dec. 31, 2012
Supplemental Employee Incentive Plan
Final trigger date occurs by June 30, 2016
Stock-Based Compensation arrangements                    
Stock based compensation expense $ 33.5 $ 39.5 $ 14.4 $ 1.4 $ 1.2 $ (0.9)        
Number of trading days during which the closing price per share of the Company's common stock equals or exceeds the goal price       20            
Number of consecutive trading days       60 days            
Interim goal price (in dollars per share)               $ 50    
Final goal price (in dollars per share)                   $ 75
Percentage of eligible employee's base salary for interim distribution               20.00%    
Total percentage of salary eligible for final distribution if final trigger is achieved                   50.00%
Incremental percentage of salary eligible for final distribution if compay paid interim distributions upon achievement of the interim trigger                   30.00%
Percentage of the total distribution paid immediately             25.00%      
Percentage of the total distribution paid on deferred payment dates             75.00%      
Distribution to be made to company's employees due to achievement of interim goal price of $50 per share                 6.8  
Percentage of total interim distribution paid in February                 25.00%  
Current distribution to be made to company's employees due to achievement of interim goal price of $50 per share                 1.7  
Percentage of total interim distribution deferred                 75.00%  
Deferred distribution to be made to company's employees due to achievement of interim goal price of $50 per share                 $ 5.1