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Investments - Income (Loss) from Principal Investments (Details) - Principal investment income (loss) from equity method investments - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Schedule of Investments [Line Items]        
Principal investment income from equity method investments $ 92.6 $ 150.9 $ 87.0 $ 570.8
Global Private Equity        
Schedule of Investments [Line Items]        
Principal investment income from equity method investments 77.2 124.7 157.8 698.8
Global Credit        
Schedule of Investments [Line Items]        
Principal investment income from equity method investments 15.0 26.8 (79.4) (134.6)
Global Investment Solutions        
Schedule of Investments [Line Items]        
Principal investment income from equity method investments $ 0.4 $ (0.6) $ 8.6 $ 6.6