v3.26.3
Investments - Schedule of Investments in NGP (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Schedule of Equity Method Investments [Line Items]    
Total $ 3,069.4 $ 2,879.5
Global Private Equity    
Schedule of Equity Method Investments [Line Items]    
Total 1,460.5 1,384.4
Total investments in NGP | Global Private Equity    
Schedule of Equity Method Investments [Line Items]    
Total 640.9 616.0
Investment in NGP Management | Global Private Equity    
Schedule of Equity Method Investments [Line Items]    
Total 220.6 247.4
Investments in NGP general partners - accrued performance allocations | Global Private Equity    
Schedule of Equity Method Investments [Line Items]    
Total 377.1 326.2
Principal investments in NGP funds | Global Private Equity    
Schedule of Equity Method Investments [Line Items]    
Total $ 43.2 $ 42.4