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Investments - Schedule of Net Investment Earnings (Loss) (Details) - NGP Management - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Schedule of Equity Method Investments [Line Items]    
Management fee-related revenues from NGP Management $ 17.0 $ 18.3
Expenses related to the investment in NGP Management (2.8) (2.9)
Amortization of basis differences from the investment in NGP Management (0.3) (0.7)
Net investment income $ 13.9 $ 14.7