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Investments - Income (Loss) from Principal Investments (Details) - Principal investment income (loss) from equity method investments (excluding performance allocations) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Schedule of Investments [Line Items]    
Principal investment income from equity method investments $ 8.3 $ 328.1
Global Private Equity    
Schedule of Investments [Line Items]    
Principal investment income from equity method investments 17.8 328.2
Global Credit    
Schedule of Investments [Line Items]    
Principal investment income from equity method investments (18.9) (2.7)
Global Investment Solutions    
Schedule of Investments [Line Items]    
Principal investment income from equity method investments $ 9.4 $ 2.6