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Stock-Based Compensation - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock compensation expense (gain) $ 3.6   $ 4.5 $ 15.7 $ 7.2
Unrecognized stock-based compensation cost 13.3     $ 13.3  
Unrecognized share-based compensation expense, weighted-average recognition period (in years)       2 years 2 months 12 days  
Chief Legal Officer          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Incremental stock-based compensation for accelerated vesting 2.2     $ 2.2  
Chief Executive Officer          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Incremental stock-based compensation for accelerated vesting       5.9  
Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized stock-based compensation cost $ 17.1     $ 17.1  
Unrecognized share-based compensation expense, weighted-average recognition period (in years)       1 year 10 months 24 days  
Restricted Stock | Chief Legal Officer          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Accelerated vesting (in shares) 76,138        
Incremental stock-based compensation for accelerated vesting $ 1.9     $ 1.9  
Restricted Stock | Chief Executive Officer          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Accelerated vesting (in shares)   142,302      
Incremental stock-based compensation for accelerated vesting $ 0.0     3.6  
Stock options | Chief Legal Officer          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Accelerated vesting (in shares) 41,487        
Incremental stock-based compensation for accelerated vesting $ 0.3     0.3  
Stock options | Chief Executive Officer          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Accelerated vesting (in shares)   237,960      
Incremental stock-based compensation for accelerated vesting $ 0.0     $ 2.3