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DEBT AND FINANCING ARRANGEMENTS - Debt (Details) - USD ($) $ in Thousands |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 01, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 10, 2019 | Jun. 19, 2019 | Dec. 06, 2017 | Mar. 13, 2014 | Mar. 23, 2010
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt |  | $ 1,808,157 | $ 1,341,961 |  |  |  |  |  |
Repayment of notes payable |  | 250,000 | 0 | $ 67,242 |  |  |  |  |
AXIS Specialty Finance PLC |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Percentage ownership in subsidiary | 100.00% |  |  |  |  |  |  |  |
Senior Notes | 5.875% Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt |  | 499,687 | 498,967 |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  | 5.875%
Senior Notes | 2.650% Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt |  | 0 | 249,885 |  |  |  |  |  |
Senior Notes | 5.150% Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt |  | 246,491 | 246,425 |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  | 5.15% |
Senior Notes | 4.000% Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt |  | 346,997 | 346,684 |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 4.00% |  |
Senior Notes | 3.900% Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt |  | 295,339 | 0 |  |  |  |  |  |
Interest rate |  |  |  |  |  | 3.90% |  |  |
Senior Notes | 2010 AXIS Specialty Finance LLC Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate | 2.65% |  |  |  |  |  |  |  | 5.875%
Senior Notes | AXIS Specialty Finance PLC | 2.65% Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Repayment of notes payable | $ 250,000 |  |  |  |  |  |  |  |
Junior Subordinated Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt |  | $ 419,643 | $ 0 |  |  |  |  |  |
Interest rate |  |  |  |  | 4.90% |  |  |  |

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