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Share-Based Compensation - Incentive Unit Awards (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Share-Based Compensation          
Personnel accruals, VIEs $ 34.8   $ 34.8   $ 45.7
Incentive Unit Award          
Share-Based Compensation          
Vesting period     3 years    
Number of share right to receive cash payment on vesting equal to fair market value is received per award (in shares)     1    
Unrecognized compensation cost 2.8   $ 2.8    
Weighted-average period for amortization of unrecognized compensation cost     1 year 2 months    
Compensation expense (credit) (0.2) $ 0.9 $ 0.1 $ 2.4  
Incentive Unit Award | Personnel Accruals          
Share-Based Compensation          
Personnel accruals, VIEs $ 2.7   $ 2.7   $ 2.6
Tranche One | Incentive Unit Award          
Share-Based Compensation          
Vesting rights percentage (as a percent)     33.33%    
Tranche Two | Incentive Unit Award          
Share-Based Compensation          
Vesting rights percentage (as a percent)     33.33%    
Tranche Three | Incentive Unit Award          
Share-Based Compensation          
Vesting rights percentage (as a percent)     33.33%