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Accrued Compensation and Benefits - Components (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Retirement Benefits [Abstract]    
Accrued performance allocations and incentive fee related compensation $ 3,939.4 $ 4,255.8
Accrued bonuses 110.4 498.2
Accrued pension liability 12.4 13.1
Other 111.7 155.1
Total 4,173.9 4,922.2
Realized performance allocations and incentive fee-related compensation not yet paid $ 15.1 $ 44.5