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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% |  |  |  |  |

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