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Share Based Compensation - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2020
Feb. 28, 2021
Sep. 30, 2021
Dec. 31, 2020
Stock Option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period     4 years  
Total unrecognized compensation cost     $ 11.5  
Weighted-average period of total unrecognized compensation cost, in years     1 year 3 months 18 days  
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares)     37,985  
Total unrecognized compensation cost     $ 7.8  
Weighted-average period of total unrecognized compensation cost, in years     1 year 1 month 6 days  
Restricted Stock | Employees and Non-employee Directors        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period     3 years  
Cash-settled Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period     3 years  
Granted (in shares)     22,385  
Total unrecognized compensation cost     $ 4.3  
Weighted-average period of total unrecognized compensation cost, in years     1 year  
Performance Shares Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period       3 years
Granted (in shares) 24,305   29,020  
Payout percent       201.00%
Stock issued during period (in shares)   48,867    
Total unrecognized compensation cost     $ 6.1  
Weighted-average period of total unrecognized compensation cost, in years     10 months 24 days