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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Investments [Abstract]        
Realized losses $ (4.5) $ (24.1) $ (49.1) $ (63.0)
Net change in unrealized gains (losses) (20.4) 145.7 107.2 325.7
Total $ (24.9) $ 121.6 $ 58.1 $ 262.7