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Investments - Strategic Investment in NGP - Narrative (Details) - USD ($)
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]      
Performance allocations, percentage (percent) 47.50%    
Basis difference $ 1,100,000   $ 1,400,000
Amortization period of basis difference 10 years    
NGP Management      
Schedule of Equity Method Investments [Line Items]      
Net investment earnings related to performance allocations $ 250,400,000 $ 0  
Net investment earnings related to principal investment income $ 18,000,000 $ 6,000,000  
Minimum | NGP Management      
Schedule of Equity Method Investments [Line Items]      
Management fee, percentage of commitments (percent) 1.00%    
Management fee, percentage of invested capital (percent) 0.50%    
Maximum | NGP Management      
Schedule of Equity Method Investments [Line Items]      
Management fee, percentage of commitments (percent) 2.00%    
Management fee, percentage of invested capital (percent) 2.00%    
Management Fee Related Revenues      
Schedule of Equity Method Investments [Line Items]      
Management fee-related revenues, allocation percentage (percent) 55.00%