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Investments - Investments of Consolidated Funds (Details)
$ in Millions
9 Months Ended
Sep. 30, 2024
USD ($)
collateralized_Loan_obligation
Dec. 31, 2023
USD ($)
Schedule of Investments [Line Items]    
Number of new collateralized loan obligations | collateralized_Loan_obligation 4  
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 $ 371.9 $ 322.0