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Investments - Realized and Unrealized Gains (Losses) Earned from Investments of Consolidated Funds (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Investments [Abstract]        
Realized gains (losses) $ (24.1) $ (9.3) $ (63.0) $ (13.1)
Net change in unrealized gains (losses) 145.7 (61.9) 325.7 (306.2)
Total $ 121.6 $ (71.2) $ 262.7 $ (319.3)