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Stock Incentive Plans - Narrative (Details)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
May 31, 2021
$ / shares
shares
Apr. 30, 2021
$ / shares
shares
Jun. 30, 2024
USD ($)
Sep. 30, 2024
Performance restricted stock units | Chief Executive Officer        
Share-based Compensation Arrangement by Share-based Payment Award        
Award vesting period (in years)       7 years
Granted (in shares) | shares 47,267 19,740,923    
Granted (in dollars per share) | $ / shares $ 23.40 $ 21.49    
Performance restricted stock units | 2021 Stock Option And Incentive Plan | Chief Executive Officer        
Share-based Compensation Arrangement by Share-based Payment Award        
Forfeiture of long-term performance awards     $ 167.3  
Forfeiture of long-term performance awards related to expenses recognized in prior periods     $ 144.6  
Minimum | PSU        
Share-based Compensation Arrangement by Share-based Payment Award        
Percentage of performance targets       0
Minimum | PSU | 2021 Stock Option And Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award        
Award vesting period (in years)       1 year
Maximum | PSU        
Share-based Compensation Arrangement by Share-based Payment Award        
Percentage of performance targets       2
Maximum | PSU | 2021 Stock Option And Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award        
Award vesting period (in years)       3 years