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Fair Value Measurement - Level III Financial Liabilities Measured at Fair Value (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
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
Level III | Loans Payable of Consolidated Funds        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period $ 6,383.9 $ 5,757.8 $ 5,491.6 $ 5,811.0
Borrowings 5.4 26.4 875.2 1,597.7
Paydowns (2.0) (1.8) (51.0) (419.1)
Sales (156.2) (193.9) (276.8) (863.4)
Realized and unrealized (gains) losses, net        
Included in earnings 131.0 (40.8) 252.7 (268.3)
Included in other comprehensive income (112.4) (244.0) (42.0) (554.2)
Balance, end of period 6,249.7 5,303.7 6,249.7 5,303.7
Changes in unrealized (gains) losses included in earnings related to financial liabilities still held at the reporting date 132.9 (41.3) 225.5 (262.6)
Changes in unrealized (gains) losses included in other comprehensive income related to financial liabilities still held at the reporting date $ (112.1) $ (235.5) $ (36.1) $ (567.0)