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DEBT AND FINANCING ARRANGEMENTS (Details) - USD ($) | Jun. 19, 2019 | Apr. 03, 2019 | Apr. 01, 2019 | Mar. 28, 2019
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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% |  |  |
Senior Notes | AXIS Specialty Finance PLC | 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% |
Senior Notes | AXIS Specialty Finance PLC | 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% |  |
Senior Notes | AXIS Specialty Finance LLC | 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 |  |  |

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