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Accrued Compensation and Benefits - Components (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Retirement Benefits [Abstract]    
Accrued performance allocations and incentive fee related compensation $ 4,819.7 $ 4,255.8
Accrued bonuses 335.5 498.2
Accrued pension liability 7.0 13.1
Other 284.4 155.1
Total 5,446.6 4,922.2
Realized performance allocations and incentive fee-related compensation not yet paid 7.1 $ 44.5
Accrued performance allocations and related compensation not yet paid $ 176.7