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Accrued Compensation and Benefits - Performance Allocations and Incentive Fee Related Compensation (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Retirement Benefits [Abstract]        
Realized $ 40.4 $ 377.0 $ 337.5 $ 776.7
Unrealized (94.3) (213.5) (377.9) (35.5)
Total $ (53.9) $ 163.5 $ (40.4) $ 741.2