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Investments - Investments in NGP (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]    
Total $ 2,758.7 $ 2,128.6
Investment in NGP Management    
Schedule of Equity Method Investments [Line Items]    
Total 370.9 371.8
Investments in NGP general partners - accrued performance allocations    
Schedule of Equity Method Investments [Line Items]    
Total 454.4 3.8
Principal investments in NGP funds    
Schedule of Equity Method Investments [Line Items]    
Total 84.6 61.3
Total investments in NGP    
Schedule of Equity Method Investments [Line Items]    
Total $ 909.9 $ 436.9