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Employee Benefit Plans - Narrative (Details)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jan. 04, 2021
item
Jan. 31, 2021
USD ($)
shares
Sep. 30, 2021
USD ($)
shares
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
shares
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
2005 Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares available for issuance (in shares) | shares     5,900,000   5,900,000    
Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock awards granted (in shares) | shares         0    
Compensation cost | $     $ 0.8 $ 1.1 $ 2.5 $ 3.2  
Performance Share Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of components of equity awards granted | item 2            
Percentage based on service and market conditions 50.00%            
Percentage based on service and performance conditions 50.00%            
Compensation cost | $     1.0 1.0 3.1 3.0  
Performance Period   3 years          
Share-based payment awards vested (in shares) | shares   368,038          
Award vesting percentage   200.00%          
Performance Share Units | Common Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based payment awards vested (in shares) | shares   736,075          
Fair value of awards vested | $   $ 3.1          
Performance Share Units | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting percentage 200.00%            
Performance Share Units | Minimum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting percentage 0.00%            
RSUs              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Compensation cost | $         0.4    
Fixed Value Cash Awards              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Long-term incentive cash awards granted | $     3.5   $ 3.5   $ 4.7
Vesting period         3 years    
Deferred compensation cost | $     $ 1.0 $ 1.1 $ 3.0 $ 3.4  
ESPP              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares available for issuance (in shares) | shares     1,600,000   1,600,000    
Purchase limit per employee (in shares) | shares         260