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Investments - Principal Investments (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Segment Reporting Information [Line Items]    
Total $ 3,153.2 $ 3,292.3
Global Private Equity    
Segment Reporting Information [Line Items]    
Total 1,660.0 1,818.0
Global Private Equity | NGP Management    
Segment Reporting Information [Line Items]    
Total 766.3 912.0
Global Credit    
Segment Reporting Information [Line Items]    
Total 1,188.4 1,157.0
Global Credit | Fortitude Group Holdings, LLC    
Segment Reporting Information [Line Items]    
Total 737.4 723.5
Carlyle AlpInvest    
Segment Reporting Information [Line Items]    
Total $ 304.8 $ 317.3