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DEBT AND FINANCING ARRANGEMENTS (Details) - USD ($)
Jun. 19, 2019
Apr. 01, 2019
Apr. 03, 2019
Mar. 28, 2019
LOC Facility Two | Letter of Credit        
Line of Credit Facility [Line Items]        
Line of credit facility       $ 250,000,000
LOC Facility | Letter of Credit        
Line of Credit Facility [Line Items]        
Line of credit facility       750,000,000
LOC Facility Three | Letter of Credit        
Line of Credit Facility [Line Items]        
Line of credit facility       $ 500,000,000
AXIS Specialty Finance PLC        
Line of Credit Facility [Line Items]        
Ownership percentage by parent   100.00%    
AXIS Specialty Finance LLC        
Line of Credit Facility [Line Items]        
Ownership percentage by parent 100.00%      
AXIS Specialty Finance PLC | Senior Notes | 2.65% Senior Notes        
Line of Credit Facility [Line Items]        
Maturities of senior debt   $ 250,000,000    
Debt instrument, interest rate, stated percentage   2.65%    
AXIS Specialty Finance PLC | Senior Notes | 5.15% Senior Notes        
Line of Credit Facility [Line Items]        
Maturities of senior debt   $ 250,000,000    
Debt instrument, interest rate, stated percentage     5.15%  
AXIS Specialty Finance LLC | Senior Notes | 3.9% Senior Notes        
Line of Credit Facility [Line Items]        
Debt instrument, interest rate, stated percentage 3.90%      
Debt instrument, face amount $ 300,000,000      
Debt instrument face amount issue percentage 99.36%      
Proceeds from issuance of senior long-term debt $ 296,000,000