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Investments - Schedule of Net Investment Earnings (Loss) (Details) - NGP Management - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Schedule of Equity Method Investments [Line Items]        
Management fee-related revenues from NGP Management $ 18.1 $ 18.2 $ 52.7 $ 54.9
Expenses related to the investment in NGP Management (3.5) (2.9) (8.9) (8.1)
Amortization of basis differences from the investment in NGP Management (0.4) (0.7) (1.1) (2.1)
Net investment income from NGP Management $ 14.2 $ 14.6 $ 42.7 $ 44.7