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Investments - Net Investment Earnings (Loss) (Details) - NGP Management - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Schedule of Equity Method Investments [Line Items]        
Management fee related revenues from NGP Management $ 20.8 $ 20.5 $ 57.3 $ 58.4
Expenses related to the investment in NGP Management (3.5) (3.5) (10.5) (11.0)
Net investment income from NGP Management $ 17.3 $ 17.0 $ 46.8 $ 47.4