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DEBT AND FINANCING ARRANGEMENTS - Senior and notes payable, Dekania Notes (Details) - USD ($) |  |  | 3 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 29, 2004 | Jun. 30, 2004 | Sep. 29, 2004 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 10, 2019 | Jun. 19, 2019 | Apr. 01, 2019 | Dec. 06, 2017 | Mar. 13, 2014 | Mar. 23, 2010
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of debt |  |  |  | $ 717,509,000 | $ 0 | $ 346,362,000 |  |  |  |  |  |
Dekania Notes, 15 Million |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Principal |  | $ 15,000,000 |  |  |  |  |  |  |  |  |  |
Dekania Notes, 11 Million |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Principal |  | $ 11,000,000 |  |  |  |  |  |  |  |  |  |
Dekania Notes, 10 Million |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Principal | $ 10,000,000 |  | $ 10,000,000 |  |  |  |  |  |  |  |  |
Dekania Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  | 2,000,000 | 2,000,000 |  |  |  |  |  |
Net proceeds from issuance of debt |  |  | $ 35,000,000 |  |  |  |  |  |  |  |  |
Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  | 67,000,000 | $ 64,000,000 | $ 51,000,000 |  |  |  |  |  |
Senior Notes | 2010 AXIS Specialty Finance LLC Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  | 2.65% |  |  | 5.875%
Senior Notes | Senior Notes Due 2045 Axis Specialty Finance PLC 2014 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  | 5.15% |
Senior Notes | Senior Notes Axis Specialty Finance PLC 2017 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  | 4.00% |  |
Junior Subordinated Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 4.90% |  |  |  |  |
Interest expense |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  |
Aggregate Principal |  |  |  |  |  |  | $ 425,000,000 |  |  |  |  |
AXIS Specialty Finance LLC |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage ownership in subsidiary |  |  |  | 100.00% |  |  |  | 100.00% |  | 100.00% | 100.00% | 100.00%
London Interbank Offered Rate (LIBOR) | Dekania Notes, 15 Million |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 3.50% |  |  |  |  |  |  |  |  |  |
London Interbank Offered Rate (LIBOR) | Dekania Notes, 11 Million |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 4.05% |  |  |  |  |  |  |  |  |  |
London Interbank Offered Rate (LIBOR) | Dekania Notes, 10 Million |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 3.50% |  |  |  |  |  |  |  |  |  |  |
AXIS Specialty Finance LLC | Senior Notes | 3.9% Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  | 3.90% |  |  |  |

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