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Stock Based Compensation (Details 5) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended 0 Months Ended 0 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Supplemental Employee Incentive Plan
Dec. 31, 2012
Supplemental Employee Incentive Plan
Dec. 31, 2011
Supplemental Employee Incentive Plan
Dec. 31, 2013
Supplemental Employee Incentive Plan
Interim trigger date
Dec. 31, 2013
Supplemental Employee Incentive Plan
Final trigger date
Jun. 30, 2012
SEIP II
Feb. 11, 2013
SEIP III
Interim trigger date occurs by June 30, 2014
May 01, 2012
SEIP III
Interim trigger date occurs by June 30, 2014
Feb. 11, 2013
SEIP III
Interim trigger date occurs by June 30, 2014
February 2013 Trigger Achievement
Aug. 27, 2013
SEIP III
Final trigger date occurs by June 30, 2016
Sep. 30, 2013
SEIP III
Final trigger date occurs by June 30, 2016
May 01, 2012
SEIP III
Final trigger date occurs by June 30, 2016
Dec. 31, 2013
SEIP IV
Dec. 31, 2013
SEIP IV
Interim trigger date occurs by September 30, 2015
Dec. 31, 2013
SEIP IV
Final trigger date occurs by September 30, 2017
Dec. 31, 2013
Performance Share Awards
item
Dec. 31, 2012
Performance Share Awards
Dec. 31, 2011
Performance Share Awards
Feb. 28, 2014
Employee Performance Share Awards
Dec. 31, 2013
Employee Performance Share Awards
item
Dec. 31, 2013
TSR Performance Share Awards
Stock-Based Compensation arrangements                                                
Stock based compensation expense $ 51.8 $ 33.5 $ 39.5 $ 11.5 $ 1.4 $ 1.2                         $ 30.9 $ 24.6 $ 28.5      
Unamortized compensation expense                                     17.0          
Unrecognized compensation expense recognition period                                     2 years          
Aggregate intrinsic value                                     115.1          
Weighted-average remaining contractual term of non-vested shares                                     2 years          
Number of types of performance shares awards for which performance goal period ended                                     2          
Number of criteria considered for awarding performance shares                                             3  
Number of years over which performance criteria is to be met                                             3 years  
Certified achievement, grant date fair value of award                                           7.4   2.9
Certified achievement, shares issuable                                           751,780   370,784
Performance share cash award in addition to shares                                               14.3
Number of trading days during which the closing price per share of the company's common stock equals or exceeds the goal price       20 days                                        
Number of consecutive trading days       60 days                                        
Period during which closing price per share equals or exceeds an interim price goal       2 years                                        
Period during which closing price per share equals or exceeds final price goal       4 years                                        
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 company 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 to be deferred in accordance with the plan       75.00%                 75.00%                      
Represents the period within which total distribution will be paid.       Interim or final trigger date occurs within the first 30 months from the effective date, 25% of the total distribution will be paid immediately and the remaining 75% will be deferred. Final trigger dates occurring during the last 18 months but before the end of the Plan, total distribution will be paid immediately.                                        
Payments under share-based compensation plan       4.5 0 0     0                              
Interim goal price (in dollars per share)                   $ 25.00 $ 25.00           $ 55.00              
Distribution to be made to company's employees due to achievement of interim goal price of $25 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 $25 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 $25 per share in August 2014                       5.1                        
Final goal price (in dollars per share)                         $ 37.50   $ 37.50     $ 80.00            
Distribution to be made to the company's employees due to achievement of interim goal price of $25 per share                         11.1                      
Percentage of the total distribution paid in September 2013                         25.00%                      
Current distribution to be made to the company's employees due to achievement of final goal price of $37.50 per share                           2.8                    
Deferred distribution to be made to the company's employees due to achievement of final goal price of $37.50 per share in August 2014                         $ 8.3                      
Assumptions                                                
Stock price volatility (as a percent)                               38.00%                
Risk free rate of return (as a percent)                               1.10%                
Annual salary increase rate (as a percent)                               4.00%                
Annual turnover rate                               4.60%