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SCHEDULE II - CONDENSED FINANCIAL INFORMATION OF PARENT COMPANY - BALANCE SHEETS, Footnotes (Details) - USD ($) | Dec. 31, 2017 | Dec. 06, 2017 | Dec. 31, 2016 | Nov. 07, 2016
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Senior Notes | 2010 AXIS Specialty Finance LLC Senior Notes |  |  |  |
Condensed Financial Information of Parent Company [Line Items] |  |  |  |
Interest rate | 5.875% |  |  |
Senior Notes | Senior Notes Due 2019 Axis Specialty Finance PLC 2014 |  |  |  |
Condensed Financial Information of Parent Company [Line Items] |  |  |  |
Interest rate | 2.65% |  |  |
Senior Notes | Senior Notes Due 2045 Axis Specialty Finance PLC 2014 |  |  |  |
Condensed Financial Information of Parent Company [Line Items] |  |  |  |
Interest rate | 5.15% |  |  |
Senior Notes | Senior Notes Axis Specialty Finance PLC 2017 |  |  |  |
Condensed Financial Information of Parent Company [Line Items] |  |  |  |
Interest rate |  | 4.00% |  |
AXIS Capital Holdings Limited |  |  |  |
Condensed Financial Information of Parent Company [Line Items] |  |  |  |
Promissory note receivable from subsidiary | $ 0 |  | $ 368,252,000 |
AXIS Capital Holdings Limited | Weather-related contracts | Full and Unconditional Guarantee of Debt |  |  |  |
Condensed Financial Information of Parent Company [Line Items] |  |  |  |
Guarantor obligations, current carrying value | 0 |  | 64,000,000 |
AXIS Capital Holdings Limited | Senior Notes | 2010 AXIS Specialty Finance LLC Senior Notes | Full and Unconditional Guarantee of Debt |  |  |  |
Condensed Financial Information of Parent Company [Line Items] |  |  |  |
Principal amount guaranteed | $ 500,000,000 |  |  |
Interest rate | 5.875% |  |  |
AXIS Capital Holdings Limited | Senior Notes | Senior Notes Due 2019 Axis Specialty Finance PLC 2014 | Full and Unconditional Guarantee of Debt |  |  |  |
Condensed Financial Information of Parent Company [Line Items] |  |  |  |
Principal amount guaranteed | $ 250,000,000 |  |  |
Interest rate | 2.65% |  |  |
AXIS Capital Holdings Limited | Senior Notes | Senior Notes Due 2045 Axis Specialty Finance PLC 2014 | Full and Unconditional Guarantee of Debt |  |  |  |
Condensed Financial Information of Parent Company [Line Items] |  |  |  |
Principal amount guaranteed | $ 250,000,000 |  |  |
Interest rate | 5.15% |  |  |
AXIS Capital Holdings Limited | Senior Notes | Senior Notes Axis Specialty Finance PLC 2017 | Full and Unconditional Guarantee of Debt |  |  |  |
Condensed Financial Information of Parent Company [Line Items] |  |  |  |
Principal amount guaranteed | $ 350,000,000 |  |  |
Interest rate | 4.00% |  |  |
AXIS Capital Holdings Limited | Revolving Credit Facility | Syndication Of Lenders | Full and Unconditional Guarantee of Debt |  |  |  |
Condensed Financial Information of Parent Company [Line Items] |  |  |  |
Guarantor obligations, current carrying value |  |  | $ 0 |
Subsidiaries [Member] | Weather-related contracts | Full and Unconditional Guarantee of Debt |  |  |  |
Condensed Financial Information of Parent Company [Line Items] |  |  |  |
Percentage ownership in subsidiary | 100.00% |  |  |
AXIS Specialty Finance LLC |  |  |  |
Condensed Financial Information of Parent Company [Line Items] |  |  |  |
Percentage ownership in subsidiary | 100.00% |  |  |
AXIS Specialty Finance LLC | Senior Notes | Full and Unconditional Guarantee of Debt |  |  |  |
Condensed Financial Information of Parent Company [Line Items] |  |  |  |
Percentage ownership in subsidiary | 100.00% |  |  |
AXIS Specialty Finance PLC |  |  |  |
Condensed Financial Information of Parent Company [Line Items] |  |  |  |
Percentage ownership in subsidiary | 100.00% |  |  |
AXIS Specialty Finance PLC | Senior Notes | Full and Unconditional Guarantee of Debt |  |  |  |
Condensed Financial Information of Parent Company [Line Items] |  |  |  |
Percentage ownership in subsidiary | 100.00% |  |  |
Promissory Note | AXIS Capital Holdings Limited |  |  |  |
Condensed Financial Information of Parent Company [Line Items] |  |  |  |
Interest rate | 1.132% |  |  |
Promissory note receivable from subsidiary |  |  |  | $ 368,000,000

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