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Investments - Principal Investments (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Segment Reporting Information [Line Items]    
Total $ 3,145.4 $ 3,024.1
Global Private Equity    
Segment Reporting Information [Line Items]    
Total 1,781.1 1,798.3
Global Private Equity | NGP Management    
Segment Reporting Information [Line Items]    
Total 918.0 916.2
Global Credit    
Segment Reporting Information [Line Items]    
Total 1,114.8 987.4
Global Credit | Fortitude Group Holdings, LLC    
Segment Reporting Information [Line Items]    
Total 709.3 595.4
Global Investment Solutions    
Segment Reporting Information [Line Items]    
Total $ 249.5 $ 238.4