XML 76 R63.htm IDEA: XBRL DOCUMENT v3.23.3
Investments - Net Investment Earnings (Loss) (Details) - NGP Management - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Schedule of Equity Method Investments [Line Items]        
Management fee related revenues from NGP Management $ 20.5 $ 18.1 $ 58.4 $ 52.7
Expenses related to the investment in NGP Management (3.5) (3.5) (11.0) (8.9)
Amortization of basis differences from the investment in NGP Management 0.0 (0.4) 0.0 (1.1)
Net investment income from NGP Management $ 17.0 $ 14.2 $ 47.4 $ 42.7