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Fair Value Measurement - Level III Financial Liabilities Measured at Fair Value (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
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
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 546.7 0.6
Paydowns (207.7) (2.1)
Sales (288.7) (38.1)
Realized and unrealized (gains) losses, net    
Included in earnings 89.4 141.4
Included in other comprehensive income (86.0) 54.5
Balance, end of period 6,352.3 5,647.9
Changes in unrealized (gains) losses included in earnings related to financial liabilities still held at the reporting date 91.1 142.4
Changes in unrealized (gains) losses included in other comprehensive income related to financial liabilities still held at the reporting date $ (87.9) $ 54.5