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Fair Value Measurement -Schedule of Level III Financial Liabilities Measured at Fair Value (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
fund
Sep. 30, 2024
USD ($)
fund
Sep. 30, 2025
USD ($)
fund
Sep. 30, 2024
USD ($)
fund
Realized and unrealized (gains) losses, net        
Number of consolidated funds | fund 3   4  
Number of deconsolidated funds | fund 1 3 2 3
Level III | Loans Payable of Consolidated Funds        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period $ 7,923.0 $ 7,623.4 $ 6,809.1 $ 6,298.6
Initial consolidation/deconsolidation of funds (521.3) (1,269.3) (801.4) (1,269.3)
Borrowings 3,446.7 591.6 5,659.0 4,138.5
Paydowns (713.9) (707.9) (1,555.5) (1,174.3)
Sales (1,890.5) 0.0 (2,243.7) (1,741.9)
Realized and unrealized (gains) losses, net        
Included in earnings (34.7) (27.5) (74.0) 67.7
Included in other comprehensive income (0.6) 135.0 415.2 26.0
Balance, end of period 8,208.7 6,345.3 8,208.7 6,345.3
Changes in unrealized (gains) losses included in earnings related to financial liabilities still held at the reporting date (21.4) (19.1) (35.9) 71.1
Changes in unrealized (gains) losses included in other comprehensive income related to financial liabilities still held at the reporting date $ 1.9 $ 135.2 $ 452.4 $ 30.2
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 Net investment income (loss) of Consolidated Funds Net investment income (loss) of Consolidated Funds