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Employee Compensation and Benefit Plans - Schedule of Stock Option Activity (Footnote) (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Apr. 22, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total intrinsic value of stock options exercised   $ 13.7 $ 35.3 $ 23.9
Shares delivered by employees as payment for the exercise price and income tax withholdings on compensation (in shares)   249,696 138,553 33,605
Shares issued related to exercise of stock options (in shares)   434,054 652,015 1,082,944
Market-based options that have not met performance criteria (in shares)   295,000    
Net aggregate intrinsic value of stock options outstanding   $ 41.1    
Net aggregate intrinsic value of stock options exercisable   $ 47.5    
Market-based options outstanding (in shares)   4,677,814    
Market-based options outstanding, exercisable (in shares)   3,986,878    
Weighted average remaining contractual term of options outstanding   4 years 5 months 20 days    
Weighted average remaining contractual term of options exercisable   3 years 9 months 18 days    
Total fair value of stock options vested and became exercisable   $ 2.6 $ 4.7 $ 2.2
Former Executive Chairman Of Board Of Directors [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options granted (in shares)       2,000,000
Stock options granted, exercise price (in dollars per share)       $ 24.38
Options surrendered (in shares) 1,000,000      
Recognized compensation expense, previously unrecognized $ 5.7