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Fair Value Measurement - Level III Financial Liabilities Measured at Fair Value (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 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 of Consolidated Funds Net investment income 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 $ 5,491.6 $ 5,811.0
Borrowings 0.6 1,108.4
Paydowns (2.1) (415.4)
Sales (38.1) (669.5)
Realized and unrealized (gains) losses, net    
Included in earnings 141.4 (46.2)
Included in other comprehensive income 54.5 (106.2)
Balance, end of period 5,647.9 5,682.1
Changes in unrealized (gains) losses included in earnings related to financial liabilities still held at the reporting date 142.4 (49.8)
Changes in unrealized (gains) losses included in other comprehensive income related to financial liabilities still held at the reporting date $ 54.5 $ (102.6)