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Share-based Compensation (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Percent of annual incentive compensation receivable in shares   100.00%     100.00%  
Compensation expense   $ 99.8   $ 83.8 $ 163.2 $ 139.0
2021 Ventures Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Assessed period 3 years          
Vesting percentage 100.00%          
Fair value of the 2021 Ventures Incentive Plan Awards   20.7     $ 20.7  
2021 Ventures Incentive Plan | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Eligible participants’ initial contribution percent 10.00%          
2021 Ventures Incentive Plan | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Eligible participants’ initial contribution percent 100.00%          
SARs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Expiration period 10 years   7 years      
Share-based compensation expense   $ 22.7   $ 18.9