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Share-Based Compensation - Narrative (Details) - 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]        
Share-based compensation expense $ 25.5 $ 6.8 $ 62.0 $ 15.9
Related tax benefits 5.1 1.2 12.2 2.6
Income tax benefit $ 0.6 $ 1.2 $ 7.2 $ 2.9
PBRSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum exercisable (in shares)     6,693,815  
Minimum | PBRSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares vesting if targets conditions met, potential percentage     0.00%  
Maximum | PBRSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares vesting if targets conditions met, potential percentage     200.00%