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Investments - Schedule of Investments as a Percentage of Investments of Consolidated Funds - Additional Information (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]    
Cost of investments of Consolidated Funds $ 7,387.9 $ 7,371.5
United States | Equity securities    
Schedule of Investments [Line Items]    
Cost of total assets 397.3 436.0
United States | Partnership and LLC interests    
Schedule of Investments [Line Items]    
Cost of total assets 389.2 504.2
United States | Loans    
Schedule of Investments [Line Items]    
Cost of total assets 36.3 26.4
United States | Total assets of the CLOs    
Schedule of Investments [Line Items]    
Cost of total assets 3,256.0 2,974.2
Europe | Total assets of the CLOs    
Schedule of Investments [Line Items]    
Cost of total assets 3,231.8 3,334.0
Global | Total assets of the CLOs    
Schedule of Investments [Line Items]    
Cost of total assets $ 77.3 $ 96.7