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Share-based Compensation (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Apr. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percent of annual incentive compensation receivable in shares         100.00%
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         $ 17.1
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