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INVESTMENTS (DETAILS 4) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Other Investments [Line Items] |  |
Other investments | $ 965,465,000 us-gaap_AlternativeInvestmentsFairValueDisclosure | $ 1,045,810,000 us-gaap_AlternativeInvestmentsFairValueDisclosure
Percentage of total fair value | 100.00%axs_AlternativeInvestmentsFairValueDisclosurePercentageOfTotal | 100.00%axs_AlternativeInvestmentsFairValueDisclosurePercentageOfTotal
Unfunded commitments related to other investments | 123,000,000 us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments | 168,000,000 us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
Hedge funds [Member] | Lockup Redemption Restriction [Member] |  |
Other Investments [Line Items] |  |
Fair value of other investments subject to redemption restrictions | 87,000,000 axs_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareRedemptionRestriction / us-gaap_InvestmentTypeAxis = us-gaap_HedgeFundsMember / axs_RedemptionRestrictionTypeAxis = axs_LockupRedemptionRestrictionMember | 99,000,000 axs_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareRedemptionRestriction / us-gaap_InvestmentTypeAxis = us-gaap_HedgeFundsMember / axs_RedemptionRestrictionTypeAxis = axs_LockupRedemptionRestrictionMember
Percentage of fair value of other investments subject to redemption restrictions | 11.00%us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareRedemptionRestrictionPercentage / us-gaap_InvestmentTypeAxis = us-gaap_HedgeFundsMember / axs_RedemptionRestrictionTypeAxis = axs_LockupRedemptionRestrictionMember | 10.00%us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareRedemptionRestrictionPercentage / us-gaap_InvestmentTypeAxis = us-gaap_HedgeFundsMember / axs_RedemptionRestrictionTypeAxis = axs_LockupRedemptionRestrictionMember
Hedge funds [Member] | Other Redemption Restriction [Member] |  |
Other Investments [Line Items] |  |
Fair value of other investments subject to redemption restrictions | 6,000,000 axs_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareRedemptionRestriction / us-gaap_InvestmentTypeAxis = us-gaap_HedgeFundsMember / axs_RedemptionRestrictionTypeAxis = axs_OtherRedemptionRestrictionMember | 11,000,000 axs_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareRedemptionRestriction / us-gaap_InvestmentTypeAxis = us-gaap_HedgeFundsMember / axs_RedemptionRestrictionTypeAxis = axs_OtherRedemptionRestrictionMember
Long/short equity funds [Member] |  |
Other Investments [Line Items] |  |
Other investments | 298,907,000 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_InvestmentTypeAxis = us-gaap_HedgeFundsEquityLongShortMember | 425,444,000 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_InvestmentTypeAxis = us-gaap_HedgeFundsEquityLongShortMember
Percentage of total fair value | 31.00%axs_AlternativeInvestmentsFairValueDisclosurePercentageOfTotal / us-gaap_InvestmentTypeAxis = us-gaap_HedgeFundsEquityLongShortMember | 41.00%axs_AlternativeInvestmentsFairValueDisclosurePercentageOfTotal / us-gaap_InvestmentTypeAxis = us-gaap_HedgeFundsEquityLongShortMember
Redemption frequency | Quarterly, Semi-annually | Monthly, Quarterly, Semi-annually
Long/short equity funds [Member] | Minimum [Member] |  |
Other Investments [Line Items] |  |
Redemption notice period | 30 days | 30 days
Long/short equity funds [Member] | Maximum [Member] |  |
Other Investments [Line Items] |  |
Redemption notice period | 60 days | 60 days
Multi-strategy funds [Member] |  |
Other Investments [Line Items] |  |
Other investments | 324,020,000 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_InvestmentTypeAxis = us-gaap_HedgeFundsMultistrategyMember | 285,155,000 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_InvestmentTypeAxis = us-gaap_HedgeFundsMultistrategyMember
Percentage of total fair value | 34.00%axs_AlternativeInvestmentsFairValueDisclosurePercentageOfTotal / us-gaap_InvestmentTypeAxis = us-gaap_HedgeFundsMultistrategyMember | 27.00%axs_AlternativeInvestmentsFairValueDisclosurePercentageOfTotal / us-gaap_InvestmentTypeAxis = us-gaap_HedgeFundsMultistrategyMember
Redemption frequency | Quarterly, Semi-annually | Quarterly, Semi-annually
Optional extension of investment term | 3 years |
Multi-strategy funds [Member] | Other Redemption Restriction [Member] |  |
Other Investments [Line Items] |  |
Unfunded commitments related to other investments | 35,000,000 us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments / us-gaap_InvestmentTypeAxis = us-gaap_HedgeFundsMultistrategyMember / axs_RedemptionRestrictionTypeAxis = axs_OtherRedemptionRestrictionMember | 60,000,000 us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments / us-gaap_InvestmentTypeAxis = us-gaap_HedgeFundsMultistrategyMember / axs_RedemptionRestrictionTypeAxis = axs_OtherRedemptionRestrictionMember
Multi-strategy funds [Member] | Minimum [Member] |  |
Other Investments [Line Items] |  |
Redemption notice period | 60 days | 60 days
Multi-strategy funds [Member] | Maximum [Member] |  |
Other Investments [Line Items] |  |
Redemption notice period | 95 days | 95 days
Event driven funds [Member] |  |
Other Investments [Line Items] |  |
Other investments | 185,899,000 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_InvestmentTypeAxis = us-gaap_HedgeFundsEventDrivenMember | 190,458,000 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_InvestmentTypeAxis = us-gaap_HedgeFundsEventDrivenMember
Percentage of total fair value | 19.00%axs_AlternativeInvestmentsFairValueDisclosurePercentageOfTotal / us-gaap_InvestmentTypeAxis = us-gaap_HedgeFundsEventDrivenMember | 18.00%axs_AlternativeInvestmentsFairValueDisclosurePercentageOfTotal / us-gaap_InvestmentTypeAxis = us-gaap_HedgeFundsEventDrivenMember
Redemption frequency | Quarterly, Annually | Quarterly, Annually
Event driven funds [Member] | Minimum [Member] |  |
Other Investments [Line Items] |  |
Redemption notice period | 45 days | 45 days
Event driven funds [Member] | Maximum [Member] |  |
Other Investments [Line Items] |  |
Redemption notice period | 60 days | 60 days
Leveraged bank loan funds [Member] |  |
Other Investments [Line Items] |  |
Other investments | 9,713,000 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_InvestmentTypeAxis = axs_HedgeFundsLeveragedBankLoansMember | 48,753,000 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_InvestmentTypeAxis = axs_HedgeFundsLeveragedBankLoansMember
Percentage of total fair value | 1.00%axs_AlternativeInvestmentsFairValueDisclosurePercentageOfTotal / us-gaap_InvestmentTypeAxis = axs_HedgeFundsLeveragedBankLoansMember | 5.00%axs_AlternativeInvestmentsFairValueDisclosurePercentageOfTotal / us-gaap_InvestmentTypeAxis = axs_HedgeFundsLeveragedBankLoansMember
Redemption frequency | Quarterly | Quarterly
Redemption notice period | 65 days | 65 days
Direct Lending Funds [Member] |  |
Other Investments [Line Items] |  |
Other investments | 54,438,000 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_InvestmentTypeAxis = axs_DirectLendingFundsMember | 22,134,000 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_InvestmentTypeAxis = axs_DirectLendingFundsMember
Percentage of total fair value | 6.00%axs_AlternativeInvestmentsFairValueDisclosurePercentageOfTotal / us-gaap_InvestmentTypeAxis = axs_DirectLendingFundsMember | 2.00%axs_AlternativeInvestmentsFairValueDisclosurePercentageOfTotal / us-gaap_InvestmentTypeAxis = axs_DirectLendingFundsMember
Optional extension of investment term | 3 years |
Direct Lending Funds [Member] | Other Redemption Restriction [Member] |  |
Other Investments [Line Items] |  |
Fair value of other investments subject to redemption restrictions | 54,438,000 axs_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareRedemptionRestriction / us-gaap_InvestmentTypeAxis = axs_DirectLendingFundsMember / axs_RedemptionRestrictionTypeAxis = axs_OtherRedemptionRestrictionMember | 22,134,000 axs_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareRedemptionRestriction / us-gaap_InvestmentTypeAxis = axs_DirectLendingFundsMember / axs_RedemptionRestrictionTypeAxis = axs_OtherRedemptionRestrictionMember
Percentage of fair value of other investments subject to redemption restrictions | 6.00%us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareRedemptionRestrictionPercentage / us-gaap_InvestmentTypeAxis = axs_DirectLendingFundsMember / axs_RedemptionRestrictionTypeAxis = axs_OtherRedemptionRestrictionMember | 2.00%us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareRedemptionRestrictionPercentage / us-gaap_InvestmentTypeAxis = axs_DirectLendingFundsMember / axs_RedemptionRestrictionTypeAxis = axs_OtherRedemptionRestrictionMember
Unfunded commitments related to other investments | 88,000,000 us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments / us-gaap_InvestmentTypeAxis = axs_DirectLendingFundsMember / axs_RedemptionRestrictionTypeAxis = axs_OtherRedemptionRestrictionMember | 88,000,000 us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments / us-gaap_InvestmentTypeAxis = axs_DirectLendingFundsMember / axs_RedemptionRestrictionTypeAxis = axs_OtherRedemptionRestrictionMember
Direct Lending Funds [Member] | Minimum [Member] |  |
Other Investments [Line Items] |  |
Investment term | 5 years |
Direct Lending Funds [Member] | Maximum [Member] |  |
Other Investments [Line Items] |  |
Investment term | 10 years |
CLO-Equities [Member] |  |
Other Investments [Line Items] |  |
Other investments | $ 92,488,000 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_InvestmentTypeAxis = axs_CloEquityTranchedSecuritiesMember | $ 73,866,000 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_InvestmentTypeAxis = axs_CloEquityTranchedSecuritiesMember
Percentage of total fair value | 9.00%axs_AlternativeInvestmentsFairValueDisclosurePercentageOfTotal / us-gaap_InvestmentTypeAxis = axs_CloEquityTranchedSecuritiesMember | 7.00%axs_AlternativeInvestmentsFairValueDisclosurePercentageOfTotal / us-gaap_InvestmentTypeAxis = axs_CloEquityTranchedSecuritiesMember

X
- Definition The percentage of the total fair value of investments in certain entities that calculate net asset value per share, including, but not limited to, by unit, membership interest, or other ownership interest. Investments include, but are not limited to, investments in certain hedge funds, venture capital funds, private equity funds, real estate partnerships or funds. + References No definition available. + Details
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- Definition Period by which the General Partner of an investment for which net asset value per dhsare is calculated has the option to extend a redemption restriction related to investments for which net asset value per share is calculated, 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 Fair value of investments in certain entities that calculate net asset value per share, including, but not limited to, by unit, membership interest, or other ownership interest. Investments include, but are not limited to, investments in certain hedge funds, venture capital funds, private equity funds, real estate partnerships or funds. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=SL6742756-110258 + Details
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- Definition Notice period the entity is required to deliver before it can redeem an investment calculated using net asset value per share, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but is not limited to, investments calculated by per unit, per membership interest, other equity or ownership interest and alternative investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=36462937&loc=SL6742756-110258 + Details
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- Definition The percentage of the total value of investments that cannot be redeemed because of a redemption restriction as of the statement of financial position date. + References No definition available. + Details
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- Definition Remaining period of a redemption restriction related to investments for which net asset value per share is calculated, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=SL6742756-110258 + Details
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- Definition The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=SL6742756-110258 + Details
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