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Stock-Based and Other Long-Term Incentive Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Sep. 30, 2019
Mar. 31, 2019
Jun. 30, 2019
Performance-based Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share-based compensation expense $ 2.3    
Time-based Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of outstanding stock, minimum 0.00%    
Percentage of outstanding stock, maximum 200.00%    
The 2015 Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity-based compensation, authorized (in shares)   9,800,000 12,300,000
Plan modification, expense recognized   $ 4.0  
The 2015 Plan | Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity-based compensation, authorized (in shares)     1,135,216
The 2015 Plan | Executive officer and key employees | Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Equity-based compensation, available for grant (in shares) 3,341,007    
Weighted average grant-date fair value (in dollars per share) $ 7.34    
The 2015 Plan | Non-employee director | Restricted Stock Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity-based compensation (in shares) 104,900