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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Schedule of Investments [Line Items]        
Principal investment income from equity method investments $ 103.5 $ 92.6 $ 207.1 $ 87.0
Global Private Equity        
Schedule of Investments [Line Items]        
Principal investment income from equity method investments 58.0 77.2 124.1 157.8
Global Credit        
Schedule of Investments [Line Items]        
Principal investment income from equity method investments 30.5 15.0 61.5 (79.4)
Global Investment Solutions        
Schedule of Investments [Line Items]        
Principal investment income from equity method investments $ 15.0 $ 0.4 $ 21.5 $ 8.6