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DEBT AND FINANCING ARRANGEMENTS - Credit facilities (Details) - USD ($) |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Mar. 27, 2017 | Mar. 26, 2017 | Aug. 02, 2016 | Mar. 31, 2015 | Mar. 30, 2015
Letter of Credit Facility | Citibank |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Maximum capacity |  |  |  |  |  |  |  | $ 500,000,000 | $ 750,000,000
LOC Facility term | 4 years |  |  |  |  |  |  |  |
Letters of credit outstanding |  | $ 387,000,000 |  |  |  |  |  |  |
Revolving Credit Facility | Syndication Of Lenders |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Potential increase in maximum capacity |  | 150,000,000 |  |  |  |  |  |  |
Credit Agreement | Letter of Credit Facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Maximum capacity |  |  |  |  |  | $ 250,000,000 |  |  |
LOC Facility | Letter of Credit Facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Maximum capacity |  |  |  |  | $ 250,000,000 |  |  |  |
Novae Syndicated Bank Facility [Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Interest Expense |  | 1,000,000 |  |  |  |  |  |  |
Novae Syndicated Bank Facility [Member] | Letter Of Credit And Revolving Credit Facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Maximum capacity |  |  |  |  |  |  | $ 229,350,400.0000 |  |
Senior Notes |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Interest Expense |  | 51,000,000 | $ 50,000,000 | $ 50,000,000 |  |  |  |  |
Senior Notes | 2010 AXIS Specialty Finance LLC Senior Notes |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Face amount |  | $ 500,000,000 |  |  | $ 500,000,000 |  |  |  |
Term Loan [Member] | Novae Syndicated Bank Facility [Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  | $ 67,000,000 |  |

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- Definition The potential increase in the maximum borrowing capacity under the credit facility at the request of the entity, subject to specified conditions. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Amount of the cost of borrowed funds accounted for as interest expense for debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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