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Investments - Strategic Investment in NGP Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]      
Percentage of carried interest income allocated to partnership for future carry funds 47.50%    
Basis difference   $ 1.4 $ 4.2
Amortization period of basis difference 10 years    
Minimum | NGP Management Company LLC      
Schedule of Equity Method Investments [Line Items]      
Management fee - percentage of commitments 1.00%    
Management fee - percentage of invested capital 0.50%    
Maximum | NGP Management Company LLC      
Schedule of Equity Method Investments [Line Items]      
Management fee - percentage of commitments 2.00%    
Management fee - percentage of invested capital 2.00%    
Investment in NGP Management      
Schedule of Equity Method Investments [Line Items]      
Percentage of carried interest income allocated to partnership for future carry funds 47.50%    
Investment in NGP Management | Management Fee Related Revenues      
Schedule of Equity Method Investments [Line Items]      
Percentage of income allocated under partnership investment 55.00%    
NGP Management Company LLC      
Schedule of Equity Method Investments [Line Items]      
Performance allocation income (loss) $ 560.7 3.8 0.0
Principal investment income (loss) $ 44.5 $ 20.1 $ (12.0)