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Investments - Investment in NGP (Additional Information) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Schedule of Equity Method Investments [Line Items]        
Performance allocations, percentage (percent)     47.50%  
Amortization period of basis difference     10 years  
Investment in NGP Management        
Schedule of Equity Method Investments [Line Items]        
Performance allocations, percentage (percent)     47.50%  
NGP Management        
Schedule of Equity Method Investments [Line Items]        
Net investment earnings related to performance allocations $ 34.8 $ 200.2 $ 36.5 $ 450.6
Net investment (losses) earnings related to principal investment income $ 4.0 $ 15.4 $ 3.9 $ 33.4
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 | Investment in NGP Management        
Schedule of Equity Method Investments [Line Items]        
Management fee-related revenues, allocation percentage (percent)     55.00%