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Investments - Principal Investments (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]    
Total $ 3,008.3 $ 2,922.0
Global Private Equity    
Segment Reporting Information [Line Items]    
Total 1,806.2 1,853.5
Global Private Equity | NGP Management    
Segment Reporting Information [Line Items]    
Total 954.6 1,015.7
Global Credit    
Segment Reporting Information [Line Items]    
Total 975.8 974.2
Global Credit | Fortitude Group Holdings, LLC    
Segment Reporting Information [Line Items]    
Total 595.4 646.0
Global Investment Solutions    
Segment Reporting Information [Line Items]    
Total $ 226.3 $ 94.3