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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
Jan. 16, 2015
Apr. 22, 2014
Dec. 31, 2015
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     $ 0.3 $ 13.7 $ 35.3  
Shares delivered by employees as payment for the exercise price and income tax withholdings on compensation (in shares)     56,013 249,696 138,553  
Shares issued related to exercise of stock options (in shares)     89,664 434,054 652,015  
Market-based options that have not met performance criteria (in shares)     340,000      
Net aggregate intrinsic value of stock options outstanding     $ 0.0      
Net aggregate intrinsic value of stock options exercisable     $ 0.0      
Market-based options outstanding (in shares)     4,722,814      
Market-based options outstanding, exercisable (in shares)     4,377,814      
Weighted average remaining contractual term of options outstanding     3 years 11 months 4 days      
Weighted average remaining contractual term of options exercisable     3 years 2 months 19 days      
Total fair value of stock options vested and became exercisable     $ 2.0 $ 2.6 $ 4.7  
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        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares 500,000