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Investments - Net Investment Earnings (Loss) (Details) - NGP Management - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Schedule of Equity Method Investments [Line Items]    
Management fee related revenues from NGP Management $ 16.1 $ 17.3
Expenses related to the investment in NGP Management (3.6) (3.2)
Impairment of investment in NGP Management (92.5) 0.0
Net investment income from NGP Management $ (80.0) $ 14.1