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Investments - Investments in NGP (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]    
Total $ 2,652.5 $ 2,128.6
Investment in NGP Management    
Schedule of Equity Method Investments [Line Items]    
Total 369.9 371.8
Investments in NGP general partners - accrued performance allocations    
Schedule of Equity Method Investments [Line Items]    
Total 254.2 3.8
Principal investments in NGP funds    
Schedule of Equity Method Investments [Line Items]    
Total 74.6 61.3
Total investments in NGP    
Schedule of Equity Method Investments [Line Items]    
Total $ 698.7 $ 436.9