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Commitments and Contingencies - Additional Information (Details)
£ in Thousands
3 Months Ended 9 Months Ended
Oct. 10, 2025
USD ($)
Jul. 10, 2025
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
GBP (£)
Mar. 17, 2025
USD ($)
Dec. 31, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2023
GBP (£)
Other Commitments [Line Items]                    
Unfunded Commitments for Capital Contributions     $ 2,584,000 $ 2,584,000            
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred but Not Reported (IBNR) Claims, Amount     3,585,000 3,585,000       $ 3,268,000    
Foreign Exchange Forward                    
Other Commitments [Line Items]                    
Derivative asset notional amount                 $ 36,675,000 £ 30,000
Derivative Asset, Current     573,000 573,000            
Derivative, Loss on Derivative     1,097,000 1,097,000 $ 347,000          
Foreign Exchange Forward | Short                    
Other Commitments [Line Items]                    
Derivative asset notional amount     96,401,000 96,401,000   £ 71,250        
Foreign Exchange Forward | Long                    
Other Commitments [Line Items]                    
Derivative asset notional amount     $ 270,600,000 270,600,000   £ 200,000        
Unsecured Line of Credit | PNC Bank                    
Other Commitments [Line Items]                    
Maximum Borrowing Capacity   $ 225,000,000         $ 85,000,000      
Debt Instrument, Basis Spread on Variable Rate   1.30%                
Short-Term Borrowings       0            
Unsecured Line of Credit | PNC Bank | EGL                    
Other Commitments [Line Items]                    
Short-Term Borrowings       $ 0            
Unsecured Line of Credit | PNC Bank | EGL | Subsequent Event                    
Other Commitments [Line Items]                    
Maximum Borrowing Capacity $ 75,000,000                  
Debt Instrument, Basis Spread on Variable Rate 1.30%