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Investments - Investment in NGP (Additional Information) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 30, 2025
Sep. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Schedule of Equity Method Investments [Line Items]                
Performance allocations, percentage (percent)           47.50%   47.50%
Partnership Common Units                
Schedule of Equity Method Investments [Line Items]                
Obligation to grant common shares   $ 10.0            
NGP Management                
Schedule of Equity Method Investments [Line Items]                
Impairment charge           $ 92.5    
Reduction in accrued performance allocations       $ 38.0   38.0    
Net investment earnings (losses) related to performance allocations     $ 23.8   $ 14.9 22.9 $ 33.2  
Net investment (losses) earnings related to principal investment income     3.3   $ 2.5 $ 8.8 $ 5.2  
Minimum                
Schedule of Equity Method Investments [Line Items]                
Performance allocations, carry funds, percentage (percent)               38.00%
Performance reduced, carry funds, percentage (percent)       35.10%        
Minimum | NGP Management                
Schedule of Equity Method Investments [Line Items]                
Useful life (in years)           5 years    
Management fee, percentage of commitments (percent)           1.50%    
Maximum                
Schedule of Equity Method Investments [Line Items]                
Performance allocations, carry funds, percentage (percent)               42.75%
Performance of reduced, percentage (percent)       43.80%        
Maximum | NGP Management                
Schedule of Equity Method Investments [Line Items]                
Useful life (in years)           7 years    
Management Fee Related Revenues | NGP Management                
Schedule of Equity Method Investments [Line Items]                
Management fee-related revenues, allocation percentage (percent) 55.00% 55.00%            
Impairment charge       $ 92.5        
Difference in the carrying value of the investments and fair value $ 352.5     352.5        
Fair value $ 260.0     $ 260.0        
Estimated fair value     $ 165.0     $ 165.0    
Management Fee Related Revenues | Investment in NGP Management                
Schedule of Equity Method Investments [Line Items]                
Management fee-related revenues, allocation percentage (percent)           55.00%