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Fair Value Measurement - Changes in Financial Liabilities Using Level III Inputs (Details)
$ in Millions
12 Months Ended
Dec. 31, 2024
USD ($)
fund
Dec. 31, 2023
USD ($)
fund
Realized and unrealized gains (losses), net    
Fair value, liability, recurring basis, unobservable input reconciliation, gain (loss), statement of income or comprehensive income Net investment income (loss) of Consolidated Funds Net investment income (loss) of Consolidated Funds
Number of deconsolidated funds | fund 4 3
Level III    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Deconsolidation of funds $ (1,269.3) $ 0.0
Level III | Loans Payable Of Consolidated Funds    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 6,298.6 5,491.6
Borrowings 7,006.0 903.0
Paydowns (2,101.8) (159.6)
Sales (2,986.7) (290.8)
Realized and unrealized gains (losses), net    
Included in earnings 72.0 239.7
Included in other comprehensive income (209.7) 114.7
Balance, end of period 6,809.1 6,298.6
Changes in unrealized (gains) losses included in earnings related to financial liabilities still held at the reporting date 86.4 250.1
Changes in unrealized (gains) losses included in other comprehensive income related to financial liabilities still held at the reporting date $ (254.2) $ 112.4