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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 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Schedule of Investments [Line Items]        
Principal investment income from equity method investments $ (13.9) $ 91.8 $ (5.6) $ 419.9
Global Private Equity        
Schedule of Investments [Line Items]        
Principal investment income from equity method investments 62.8 245.9 80.6 574.1
Global Credit        
Schedule of Investments [Line Items]        
Principal investment income from equity method investments (75.5) (158.7) (94.4) (161.4)
Global Investment Solutions        
Schedule of Investments [Line Items]        
Principal investment income from equity method investments $ (1.2) $ 4.6 $ 8.2 $ 7.2