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Share-Based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Mar. 08, 2021
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 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   $ 10.4 $ 11.4 $ 37.4 $ 27.1
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   $ 0.7 $ 1.5 $ 2.2 $ 3.5
Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of stock units granted (in shares)   0.0 0.0 0.7 1.1
Stock units, weighted average grant-date fair value (in dollars per share)   $ 22.80 $ 29.67 $ 22.82 $ 29.62
Compensation expense related to restricted stocks   $ 4.5 $ 3.8 $ 13.2 $ 9.8
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   $ 5.2 $ 6.1 $ 22.0 $ 13.8
Number of stock units granted (in shares)   0.0   0.5 1.4
Stock units, weighted average grant-date fair value (in dollars per share)   $ 23.28   $ 23.37 $ 29.42
Cliff vesting period       3 years  
Performance Shares | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance achievement metric, percentage       0.00%  
Performance Shares | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance achievement metric, percentage       200.00%  
Performance Shares | Tranche One          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights, percentage       50.00%  
Award vesting period       3 years  
Performance Shares | Tranche Two          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights, percentage       50.00%  
Award vesting period       4 years