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Fair Value Measurement - Level III Financial Liabilities Measured at Fair Value (Details)
$ in Millions
3 Months Ended
Mar. 31, 2025
USD ($)
fund
Mar. 31, 2024
USD ($)
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 1  
Level III | Loans Payable of Consolidated Funds    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period $ 6,809.1 $ 6,298.6
Initial consolidation of funds 193.8 0.0
Borrowings 782.1 546.7
Paydowns (242.1) (207.7)
Sales (6.5) (288.7)
Realized and unrealized (gains) losses, net    
Included in earnings 1.2 89.4
Included in other comprehensive income 142.7 (86.0)
Balance, end of period 7,680.3 6,352.3
Changes in unrealized (gains) losses included in earnings related to financial liabilities still held at the reporting date 10.0 91.1
Changes in unrealized (gains) losses included in other comprehensive income related to financial liabilities still held at the reporting date $ 133.5 $ (87.9)