Investments - Strategic Investment in NGP (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Total	$ 2,922.0	$ 2,128.6
Investment in NGP Management
Schedule of Equity Method Investments [Line Items]
Total	369.7	371.8
Investments in NGP general partners - accrued performance allocations
Schedule of Equity Method Investments [Line Items]
Total	564.5	3.8
Principal investments in NGP funds
Schedule of Equity Method Investments [Line Items]
Total	81.5	61.3
Total investments in NGP
Schedule of Equity Method Investments [Line Items]
Total	$ 1,015.7	$ 436.9