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Investments - Strategic Investment in NGP - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]          
Performance allocations, percentage (percent)     47.50%    
Basis difference $ 0.7   $ 0.7   $ 1.4
Amortization period of basis difference     10 years    
NGP Management          
Schedule of Equity Method Investments [Line Items]          
Net investment earnings related to performance allocations 200.2 $ 1.1 $ 450.6 $ 1.1  
Net investment earnings related to principal investment income $ 15.4 $ 5.7 $ 33.4 $ 11.7  
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%