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Fair Value Measurement - Level III Financial Liabilities Measured at Fair Value (Details) - Level III - Loans Payable of Consolidated Funds - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period $ 5,373.9 $ 4,412.0 $ 5,563.0 $ 4,685.2
Deconsolidation/consolidation of funds 480.0 0.0 360.8 0.0
Borrowings 1,133.0 745.2 1,966.6 1,886.9
Paydowns (712.0) (1.3) (1,303.0) (1,092.0)
Sales (237.5) (260.4) (515.2) (260.4)
Realized and unrealized (gains) losses, net        
Included in earnings (2.4) 139.1 90.7 (188.5)
Included in other comprehensive income (96.7) 147.1 (224.6) 150.5
Balance, end of period 5,938.3 5,181.7 5,938.3 5,181.7
Changes in unrealized (gains) losses included in earnings related to financial liabilities still held at the reporting date 3.7 139.1 98.1 (203.4)
Changes in unrealized (gains) losses included in other comprehensive income related to financial liabilities still held at the reporting date $ (127.0) $ 147.1 $ (281.4) $ 158.9