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Commitments and Contingencies - Performance-Contingent Awards (Details) - Long-Term Retention and Incentive Cash Bonus Awards - Employees - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Commitments and Contingencies      
Service-based vesting period     5 years
Share-based compensation expense recognized   $ 8.9  
Maximum potential of compensation expenses   $ 18.2  
First and Second tranches      
Commitments and Contingencies      
Share-based compensation expense recognized $ 4.3    
Maximum potential of compensation expenses 5.4    
Second and Third tranche      
Commitments and Contingencies      
Share-based compensation expense recognized 17.8    
Maximum potential of compensation expenses 21.0    
Third tranche      
Commitments and Contingencies      
Share-based compensation expense recognized $ 0.0