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INVESTMENTS (DETAILS 4) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Other Investments [Line Items]    
Other investments $ 965,465,000us-gaap_AlternativeInvestmentsFairValueDisclosure $ 1,045,810,000us-gaap_AlternativeInvestmentsFairValueDisclosure
Percentage of total fair value 100.00%axs_AlternativeInvestmentsFairValueDisclosurePercentageOfTotal 100.00%axs_AlternativeInvestmentsFairValueDisclosurePercentageOfTotal
Unfunded commitments related to other investments 123,000,000us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments 168,000,000us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
Hedge funds [Member] | Lockup Redemption Restriction [Member]    
Other Investments [Line Items]    
Fair value of other investments subject to redemption restrictions 87,000,000axs_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareRedemptionRestriction
/ us-gaap_InvestmentTypeAxis
= us-gaap_HedgeFundsMember
/ axs_RedemptionRestrictionTypeAxis
= axs_LockupRedemptionRestrictionMember
99,000,000axs_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 6,000,000axs_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareRedemptionRestriction
/ us-gaap_InvestmentTypeAxis
= us-gaap_HedgeFundsMember
/ axs_RedemptionRestrictionTypeAxis
= axs_OtherRedemptionRestrictionMember
11,000,000axs_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareRedemptionRestriction
/ us-gaap_InvestmentTypeAxis
= us-gaap_HedgeFundsMember
/ axs_RedemptionRestrictionTypeAxis
= axs_OtherRedemptionRestrictionMember
Long/short equity funds [Member]    
Other Investments [Line Items]    
Other investments 298,907,000us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= us-gaap_HedgeFundsEquityLongShortMember
425,444,000us-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 324,020,000us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= us-gaap_HedgeFundsMultistrategyMember
285,155,000us-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 35,000,000us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
/ us-gaap_InvestmentTypeAxis
= us-gaap_HedgeFundsMultistrategyMember
/ axs_RedemptionRestrictionTypeAxis
= axs_OtherRedemptionRestrictionMember
60,000,000us-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 185,899,000us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= us-gaap_HedgeFundsEventDrivenMember
190,458,000us-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 9,713,000us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= axs_HedgeFundsLeveragedBankLoansMember
48,753,000us-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 54,438,000us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= axs_DirectLendingFundsMember
22,134,000us-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 54,438,000axs_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareRedemptionRestriction
/ us-gaap_InvestmentTypeAxis
= axs_DirectLendingFundsMember
/ axs_RedemptionRestrictionTypeAxis
= axs_OtherRedemptionRestrictionMember
22,134,000axs_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 88,000,000us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
/ us-gaap_InvestmentTypeAxis
= axs_DirectLendingFundsMember
/ axs_RedemptionRestrictionTypeAxis
= axs_OtherRedemptionRestrictionMember
88,000,000us-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 $ 92,488,000us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= axs_CloEquityTranchedSecuritiesMember
$ 73,866,000us-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