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Share-Based Compensation - Incentive Unit Awards (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Share-Based Compensation          
Personnel accruals $ 41.1   $ 41.1   $ 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 2.3   $ 2.3    
Weighted-average period for amortization of unrecognized compensation cost     1 year    
Compensation expense (benefit) 1.0 $ 1.5 $ 1.1 $ 3.9  
Incentive Unit Award | Personnel Accruals          
Share-Based Compensation          
Personnel accruals $ 3.7   $ 3.7   $ 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%