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Investments - Investments of Consolidated Funds (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Investments measured at net asset value   $ 7,962.9
Minimum percent of aggregate assets for individual investments with fair value 5.00%  
Consolidated VIEs | Equity securities    
Schedule of Investments [Line Items]    
Investments measured at net asset value $ 332.1 $ 322.0