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Stock-Based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Feb. 19, 2019
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Stock-based Compensation arrangements            
Stock based compensation expense   $ 8.3 $ 6.7 $ 24.6 $ 21.9  
Restricted stock units            
Stock-based Compensation arrangements            
Granted (shares)       124,012    
Granted (dollars per share)       $ 15.75    
Performance share awards | Minimum            
Stock-based Compensation arrangements            
Annual forfeiture rate assumption (as a percent)       0.00%    
Performance share awards | Maximum            
Stock-based Compensation arrangements            
Annual forfeiture rate assumption (as a percent)       5.00%    
Performance share awards based on internal performance metrics            
Stock-based Compensation arrangements            
Right to receive additional shares, maximum       100.00%    
Employee performance share awards            
Stock-based Compensation arrangements            
Granted (shares)       722,500    
Granted (dollars per share)       $ 15.60    
Minimum operating cash flow for the year preceding the performance period           $ 100.0
Number of years over which performance criteria is to be met       3 years    
Employee performance share awards | Hybrid performance share awards, percentage vesting on the third anniversary            
Stock-based Compensation arrangements            
Award vesting rights (as a percent)   100.00%        
Hybrid performance share awards            
Stock-based Compensation arrangements            
Granted (shares)       506,412    
Granted (dollars per share)       $ 15.60    
Minimum operating cash flow for the year preceding the performance period       $ 100.0    
Hybrid performance share awards | Hybrid performance share awards, percentage vesting on the first anniversary            
Stock-based Compensation arrangements            
Award vesting rights (as a percent)       25.00%    
Hybrid performance share awards | Hybrid performance share awards, percentage vesting on the second anniversary            
Stock-based Compensation arrangements            
Award vesting rights (as a percent)       25.00%    
Hybrid performance share awards | Hybrid performance share awards, percentage vesting on the third anniversary            
Stock-based Compensation arrangements            
Award vesting rights (as a percent)       50.00%    
Performance shares based on market conditions            
Stock-based Compensation arrangements            
Right to receive shares       100.00%    
Right to receive an additional award in cash       100.00%    
TSR performance share awards            
Stock-based Compensation arrangements            
Granted (shares)       862,180    
Granted (dollars per share) $ 13.79          
Performance period       3 years    
TSR performance share awards | Minimum            
Stock-based Compensation arrangements            
Granted (dollars per share)       $ 12.66    
TSR performance share awards | Maximum            
Stock-based Compensation arrangements            
Granted (dollars per share)       $ 15.28