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Stock-Based Compensation - Narrative (Details)
shares in Thousands, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2021
USD ($)
item
shares
Sep. 30, 2021
USD ($)
shares
Sep. 30, 2020
shares
Sep. 30, 2021
USD ($)
shares
Sep. 30, 2020
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number Of Performance Goals | item 2        
Antidilutive shares excluded from diluted earnings per share calculation (in shares) | shares   1,500 3,200 1,300 4,100
PSUs | Certain Executives          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted (in shares) | shares 800        
Fair value of shares granted | $ $ 1.2        
PSUs | Certain Senior Leaders          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted (in shares) | shares 400        
Fair value of shares granted | $ $ 0.6        
Employee Stock Option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation expense, stock options | $   $ 0.1   $ 0.1  
Unrecognized compensation expense, weighted-average period recognized       1 year 1 month 6 days  
RSUs and PSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted (in shares) | shares       4,791  
Unrecognized compensation expense, weighted-average period recognized       1 year 10 months 24 days  
Unrecognized compensation expense, RSUs and PSUs | $   $ 8.0   $ 8.0  
Minimum | PSUs | Certain Executives          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares received from rewards, percent 0.00%        
Minimum | PSUs | Certain Senior Leaders          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares received from rewards, percent 0.00%        
Maximum | PSUs | Certain Executives          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares received from rewards, percent 173.00%        
Maximum | PSUs | Certain Senior Leaders          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares received from rewards, percent 200.00%