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DEBT AND FINANCING ARRANGEMENTS - Senior and Notes payable, Dekania Notes (Details) - USD ($)
12 Months Ended
Dec. 06, 2017
Mar. 13, 2014
Mar. 23, 2010
Sep. 29, 2004
Jun. 30, 2004
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Mar. 27, 2017
Senior notes [Line Items]                  
Net proceeds from issuance of debt           $ 346,362,000 $ 0 $ 0  
Senior Notes                  
Senior notes [Line Items]                  
Interest Expense           51,000,000 $ 50,000,000 $ 50,000,000  
Senior Notes | 2010 AXIS Specialty Finance LLC Senior Notes                  
Senior notes [Line Items]                  
Face amount           $ 500,000,000     $ 500,000,000
Interest rate           5.875%      
Issue price (percentage of face amount)     99.624%            
Net proceeds from issuance of debt     $ 495,000,000            
Senior Notes | Senior Notes Due 2019 Axis Specialty Finance PLC 2014                  
Senior notes [Line Items]                  
Face amount           $ 250,000,000      
Interest rate           2.65%      
Issue price (percentage of face amount)   99.896%              
Net proceeds from issuance of debt   $ 248,000,000              
Senior Notes | Senior Notes Due 2045 Axis Specialty Finance PLC 2014                  
Senior notes [Line Items]                  
Face amount           $ 250,000,000      
Interest rate           5.15%      
Issue price (percentage of face amount)   99.474%              
Net proceeds from issuance of debt   $ 246,000,000              
Senior Notes | Senior Notes Axis Specialty Finance PLC 2017                  
Senior notes [Line Items]                  
Face amount $ 350,000,000                
Interest rate 4.00%                
Issue price (percentage of face amount) 99.78%                
Net proceeds from issuance of debt $ 347,000,000                
Senior Notes | Senior Notes Due 2027 Axis Specialty Finance PLC 2017                  
Senior notes [Line Items]                  
Interest rate 4.00%                
Subordinated Debt                  
Senior notes [Line Items]                  
Net proceeds from issuance of debt         $ 35,000,000        
Interest Expense           $ 2,000,000      
Subordinated Debt | Dekania Notes, 15 Million                  
Senior notes [Line Items]                  
Face amount         15,000,000        
Subordinated Debt | Dekania Notes, 11 Million                  
Senior notes [Line Items]                  
Face amount         $ 11,000,000        
Subordinated Debt | Dekania Notes, 10 Million                  
Senior notes [Line Items]                  
Face amount       $ 10,000,000          
AXIS Specialty Finance LLC                  
Senior notes [Line Items]                  
Percentage ownership in subsidiary           100.00%      
AXIS Specialty Finance PLC                  
Senior notes [Line Items]                  
Percentage ownership in subsidiary           100.00%      
London Interbank Offered Rate (LIBOR) | Subordinated Debt | Dekania Notes, 15 Million                  
Senior notes [Line Items]                  
Basis spread on variable rate         3.50%        
London Interbank Offered Rate (LIBOR) | Subordinated Debt | Dekania Notes, 11 Million                  
Senior notes [Line Items]                  
Basis spread on variable rate         4.05%        
London Interbank Offered Rate (LIBOR) | Subordinated Debt | Dekania Notes, 10 Million                  
Senior notes [Line Items]                  
Basis spread on variable rate       3.50%