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Share-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
May 19, 2017
May 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
May 17, 2019
Share Based Compensation                
Options outstanding and exercisable (in share)     520,105     520,105    
Weighted average exercise price of options exercisable (in dollars per share)     $ 12.77     $ 12.77    
Average remaining contractual term of options exercisable           6 years 7 months 6 days    
Stock-based compensation expense     $ 3.1   $ 3.4 $ 15.6 $ 10.1  
Special Equity Plan                
Share Based Compensation                
Shares of common stock authorized for issuance under the share-based compensation plan 1,500,000              
2019 Omnibus Incentive Plan                
Share Based Compensation                
Shares of common stock authorized for issuance under the share-based compensation plan               2,025,000
2016 Omnibus Incentive Plan                
Share Based Compensation                
Available for issuance (in shares)               243,611
Stock Options | Special Equity Plan                
Share Based Compensation                
Issued (in shares) 800,000              
Performance-based stock awards                
Share Based Compensation                
Shares outstanding     367,097     367,097    
Weighted average grant date fair value     $ 18.94     $ 18.94    
Performance-based stock awards | Special Equity Plan                
Share Based Compensation                
Issued (in shares) 300,000              
Performance period   33 months            
Reduction in performance period   3 months            
Incremental fair value       $ 5.9        
Unvested restricted stock                
Share Based Compensation                
Shares outstanding     1,564,081     1,564,081    
Employee Service Based Awards                
Share Based Compensation                
Shares outstanding     1,126,361     1,126,361    
Weighted average grant date fair value     $ 19.23     $ 19.23    
Director Service Based Awards                
Share Based Compensation                
Shares outstanding     70,623     70,623    
Weighted average grant date fair value     $ 17.08     $ 17.08