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Stock-based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Feb. 19, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Stock-based Compensation arrangements          
Stock based compensation expense   $ 6.7 $ 5.7 $ 21.9 $ 11.1
Decrease to tax expense from stock-based compensation activities       $ 0.9  
Increase to tax expense from stock-based compensation activities         $ 0.2
Restricted Stock Units          
Stock-based Compensation arrangements          
Granted (in shares)       78,290  
Granted (in dollars per share)       $ 25.01  
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 (as a percent)       100.00%  
Employee Performance Share Awards          
Stock-based Compensation arrangements          
Granted (in shares)       526,730  
Granted (in dollars per share)       $ 24.95  
Number of years over which performance criteria is to be met       3 years  
Hybrid Performance Share Awards          
Stock-based Compensation arrangements          
Granted (in shares)       315,029  
Granted (in dollars per share)       $ 24.95  
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 (as a percent)       100.00%  
Right to receive an additional award in cash (as a percent)       100.00%  
TSR Performance Share Awards          
Stock-based Compensation arrangements          
Granted (in shares)       536,673  
Granted (in dollars per share) $ 20.63        
Performance period       3 years  
TSR Performance Share Awards | Minimum          
Stock-based Compensation arrangements          
Granted (in dollars per share)       $ 11.46  
TSR Performance Share Awards | Maximum          
Stock-based Compensation arrangements          
Granted (in dollars per share)       $ 22.04