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Investments - Principal Investment Income (Loss) from Equity Method Investments (Details) - Principal investment income (loss) from equity method investments - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]      
Principal investment income from equity method investments $ 236.5 $ 116.6 $ 619.5
Global Private Equity      
Schedule of Investments [Line Items]      
Principal investment income from equity method investments 140.8 157.6 744.8
Global Credit      
Schedule of Investments [Line Items]      
Principal investment income from equity method investments 71.2 (60.0) (134.8)
Global Investment Solutions      
Schedule of Investments [Line Items]      
Principal investment income from equity method investments $ 24.5 $ 19.0 $ 9.5