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Share-Based Compensation - Incentive Unit Awards (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Share-Based Compensation      
Personnel accruals, VIEs $ 23.7   $ 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 1    
Unrecognized compensation cost $ 5.2    
Weighted-average period for amortization of unrecognized compensation cost 1 year 6 months    
Compensation expense $ 0.3 $ 1.5  
Incentive Unit Award | Personnel Accruals      
Share-Based Compensation      
Personnel accruals, VIEs $ 2.9   $ 2.6
Tranche One | Incentive Unit Award      
Share-Based Compensation      
Vesting rights percentage 33.33%    
Tranche Two | Incentive Unit Award      
Share-Based Compensation      
Vesting rights percentage 33.33%    
Tranche Three | Incentive Unit Award      
Share-Based Compensation      
Vesting rights percentage 33.33%