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Fair Value Measurement - Level III Financial Liabilities Measured at Fair Value (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
USD ($)
fund
Sep. 30, 2023
USD ($)
fund
Sep. 30, 2024
USD ($)
fund
Sep. 30, 2023
USD ($)
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 Net investment income (loss) of Consolidated Funds Net investment income (loss) of Consolidated Funds
Number of deconsolidated funds | fund 3 1 3 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 $ 7,623.4 $ 6,383.9 $ 6,298.6 $ 5,491.6
Deconsolidation of funds (1,269.3) 0.0 (1,269.3) 0.0
Borrowings 591.6 5.4 4,138.5 875.2
Paydowns (707.9) (2.0) (1,174.3) (51.0)
Sales 0.0 (156.2) (1,741.9) (276.8)
Realized and unrealized (gains) losses, net        
Included in earnings (27.5) 131.0 67.7 252.7
Included in other comprehensive income 135.0 (112.4) 26.0 (42.0)
Balance, end of period 6,345.3 6,249.7 6,345.3 6,249.7
Changes in unrealized (gains) losses included in earnings related to financial liabilities still held at the reporting date (19.1) 132.9 71.1 225.5
Changes in unrealized (gains) losses included in other comprehensive income related to financial liabilities still held at the reporting date $ 135.2 $ (112.1) $ 30.2 $ (36.1)