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Share-Based Payments, Deferred Compensation and Employee Ownership Plans - Share-Based Payments and Deferred Compensation Narrative (Details) - Equity Plans - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-compensation expense recognized in connection with compensation plan $ 10.3 $ 11.6 $ 61.3 $ 35.2
Tax benefit of stock-compensation expense recognized in connection with compensation plan $ 6.5 $ 3.1 $ 29.4 $ 8.4
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted 2,700,000   2,700,000  
Restricted Stock | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock compensation award, vesting period     2 years  
Restricted Stock | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock compensation award, vesting period     5 years  
Employee Stock | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock compensation award, vesting period     2 years  
Employee Stock | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock compensation award, vesting period     5 years  
Expiration period     7 years  
Deferred Cash Award        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock compensation award, vesting period     4 years  
Deferred cash awards granted     $ 34.4  
Deferred cash award, interest rate     0.70%  
Deferred cash awards, unrecognized compensation expense $ 64.6   $ 64.6