v3.26.1
DEBT AND CREDIT FACILITIES - Narrative (Details) - Financial Standby Letter of Credit
Jun. 30, 2026
USD ($)
Jun. 30, 2026
GBP (£)
Apr. 29, 2026
GBP (£)
Apr. 28, 2026
GBP (£)
Apr. 01, 2026
USD ($)
Mar. 31, 2026
USD ($)
Line of Credit Facility [Line Items]            
Capacity $ 675,000,000          
LCs issued 344,573,000          
CIBC            
Line of Credit Facility [Line Items]            
Capacity         $ 300,000,000 $ 200,000,000
LCs issued $ 190,939,000          
CIBC | Greenlight Re            
Line of Credit Facility [Line Items]            
Capacity         250,000,000  
CIBC | GRIL            
Line of Credit Facility [Line Items]            
Capacity         $ 50,000,000  
Citibank FAL            
Line of Credit Facility [Line Items]            
Capacity | £   £ 60,000,000 £ 60,000,000 £ 50,000,000    
Additional line of credit | £     13,000,000      
LCs issued | £   £ 58,000,000 £ 58,000,000