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Stock Based Compensation - Components of Equity-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Feb. 08, 2019
Feb. 07, 2019
Jun. 30, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense:   $ 11.7   $ 33.3 $ 45.1 $ 11.7
Expected tax benefit:   0.0   3.6 6.4 0.0
Cash value per share of stock repurchased and retired during period (USD per share) $ 145          
Acceleration charge   10.4       56.3
Restricted stock and restricted stock units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense:   11.7   18.7 3.1 0.0
Expected tax benefit:   0.0   3.4 0.5 0.0
Stock options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense:   0.0 $ 20.0 3.0 23.0 0.0
Expected tax benefit:   0.0   0.2 5.9 0.0
Incentive units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense:   $ 0.0   $ 11.6 $ 19.0 $ 11.7