v3.25.4
DEBT AND CREDIT FACILITIES - Credit Facilities Narrative (Details)
Dec. 31, 2025
USD ($)
Dec. 18, 2025
USD ($)
Oct. 03, 2024
USD ($)
Nov. 01, 2023
USD ($)
Oct. 31, 2023
USD ($)
Nov. 18, 2022
USD ($)
Sep. 08, 2022
USD ($)
Dec. 16, 2021
USD ($)
Line of Credit Facility [Line Items]                
Credit facilities outstanding $ 528,786,000              
Top Layer Reinsurance Ltd. | Letter of Credit                
Line of Credit Facility [Line Items]                
Line of credit facility, maximum borrowing capacity 37,500,000              
Top Layer Reinsurance Ltd. | Letter of Credit | Capital Support Agreement                
Line of Credit Facility [Line Items]                
Mandatory capital contribution in the event of capital and surplus reduction below a specified level 50,000,000.0              
Revolving Credit Facility                
Line of Credit Facility [Line Items]                
Credit facilities outstanding $ 0              
Revolving Credit Facility | Medici                
Line of Credit Facility [Line Items]                
Line of credit facility, maximum borrowing capacity   $ 75,000,000            
Revolving Credit Facility                
Line of Credit Facility [Line Items]                
Letter of credit aggregate commitment           $ 500,000,000.0    
Line of credit facility, maximum borrowing capacity           700,000,000.0    
Debt to capital ratio 0.35              
Minimum net worth requirements $ 4,000,000,000.0              
Revolving Credit Facility | Bridge Loan                
Line of Credit Facility [Line Items]                
Line of credit facility, maximum borrowing capacity           $ 50,000,000.0    
Secured Bilateral Facility | Letter of Credit | Citibank Europe plc | Bilateral Facility Participants                
Line of Credit Facility [Line Items]                
Line of credit facility, maximum borrowing capacity       $ 320,000,000.0 $ 180,000,000      
Accordion feature, maximum borrowing capacity       $ 350,000,000        
Loan agreement, remaining borrowing capacity 121,800,000              
Secured Bilateral Facility | Letter of Credit | Citibank Europe plc                
Line of Credit Facility [Line Items]                
Credit facilities outstanding 198,200,000              
Unsecured Bilateral Facility | Letter of Credit | Citibank Europe plc                
Line of Credit Facility [Line Items]                
Credit facilities outstanding 241,300,000              
Unsecured Bilateral Facility | Letter of Credit | Credit Suisse (Switzerland) Ltd.                
Line of Credit Facility [Line Items]                
Line of credit facility, maximum borrowing capacity               $ 200,000,000
Standby Letter of Credit Agreement | Letter of Credit | Nordea Bank Abp, New York Branch                
Line of Credit Facility [Line Items]                
Line of credit facility, maximum borrowing capacity     $ 250,000,000.0          
Credit facilities outstanding 81,000,000.0              
Uncommitted Letter of Credit Facility | Letter of Credit | Société Générale, New York Branch (“SocGen”)                
Line of Credit Facility [Line Items]                
Line of credit facility, maximum borrowing capacity             $ 250,000,000  
Secured Letter of Credit Facility | Letter of Credit | Citibank Europe                
Line of Credit Facility [Line Items]                
Credit facilities outstanding $ 8,300,000