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Investments - Net Investment Earnings (Loss) (Details) - NGP Management - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Schedule of Equity Method Investments [Line Items]    
Management fee related revenues from NGP Management $ 17.3 $ 18.1
Expenses related to the investment in NGP Management (3.2) (3.4)
Net investment income from NGP Management $ 14.1 $ 14.7