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Share-Based Employee Compensation - Narrative (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 08, 2021
Mar. 31, 2022
Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Cost (reversal) of employee share-based compensation included in income, before income tax   $ 13.8 $ 4.6
Replacement Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options converted in connection with acquisition (in shares) 3.2    
Restricted stock awards converted in connection with acquisition (in shares) 0.2    
Cost (reversal) of employee share-based compensation included in income, before income tax   $ 0.8 $ 0.4
Restricted Stock Units, Inducement Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of stock units granted (in shares)   0.5 1.0
Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock units, weighted average grant-date fair value (in dollars per share)   $ 23.43 $ 29.61
Compensation expense related to restricted stocks   $ 4.1 $ 2.2
Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Cost (reversal) of employee share-based compensation included in income, before income tax   $ 8.9 $ 2.0
Number of stock units granted (in shares)   0.6 1.3
Stock units, weighted average grant-date fair value (in dollars per share)   $ 30.73 $ 29.58
Cliff vesting period   3 years  
Performance Shares | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares issued in period, performance achievement metric, percentage   0.00%  
Performance Shares | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares issued in period, performance achievement metric, percentage   200.00%