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Investments - Investments in NGP (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Schedule of Equity Method Investments [Line Items]    
Total $ 3,153.2 $ 3,292.3
Global Private Equity    
Schedule of Equity Method Investments [Line Items]    
Total 1,660.0 1,818.0
Investment in NGP Management | Global Private Equity    
Schedule of Equity Method Investments [Line Items]    
Total 275.7 369.2
Investments in NGP general partners - accrued performance allocations | Global Private Equity    
Schedule of Equity Method Investments [Line Items]    
Total 441.4 489.4
Principal investments in NGP funds | Global Private Equity    
Schedule of Equity Method Investments [Line Items]    
Total 49.2 53.4
Total investments in NGP | Global Private Equity    
Schedule of Equity Method Investments [Line Items]    
Total $ 766.3 $ 912.0