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Investments - Principal Investments (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Segment Reporting Information [Line Items]    
Total $ 2,883.8 $ 2,128.6
NGP Management    
Segment Reporting Information [Line Items]    
Total 988.2 436.9
Fortitude Group Holdings, LLC    
Segment Reporting Information [Line Items]    
Total 645.3 715.7
iStar    
Segment Reporting Information [Line Items]    
Total 184.2  
Global Private Equity    
Segment Reporting Information [Line Items]    
Total 1,832.8 1,231.2
Global Credit    
Segment Reporting Information [Line Items]    
Total 960.3 819.7
Global Investment Solutions    
Segment Reporting Information [Line Items]    
Total $ 90.7 $ 77.7