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Share-Based Compensation - Incentive Unit Awards (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Share-Based Compensation          
Personnel accruals $ 37.8   $ 37.8   $ 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 expense 5.1   $ 5.1    
Weighted-average period for amortization of unrecognized compensation cost     1 year 4 months    
Compensation expense (benefit) 1.3 $ (0.2) $ 2.5 $ 0.1  
Incentive Unit Award | Personnel Accruals          
Share-Based Compensation          
Personnel accruals $ 4.2   $ 4.2   $ 1.9
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%