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INVESTMENTS (DETAILS 4) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Other Investments [Line Items]      
Other investments $ 939,006,000us-gaap_AlternativeInvestmentsFairValueDisclosure $ 965,465,000us-gaap_AlternativeInvestmentsFairValueDisclosure  
Percentage of total fair value 100.00%axs_AlternativeInvestmentsFairValueDisclosurePercentageOfTotal 100.00%axs_AlternativeInvestmentsFairValueDisclosurePercentageOfTotal  
Hedge Funds [Member] | Lockup Redemption Restriction [Member]      
Other Investments [Line Items]      
Fair value of other investments subject to redemption restrictions 95,000,000axs_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareRedemptionRestriction
/ us-gaap_InvestmentTypeAxis
= us-gaap_HedgeFundsMember
/ axs_RedemptionRestrictionTypeAxis
= axs_LockupRedemptionRestrictionMember
87,000,000axs_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareRedemptionRestriction
/ us-gaap_InvestmentTypeAxis
= us-gaap_HedgeFundsMember
/ axs_RedemptionRestrictionTypeAxis
= axs_LockupRedemptionRestrictionMember
 
Percentage of fair value of other investments subject to redemption restrictions 12.00%us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareRedemptionRestrictionPercentage
/ us-gaap_InvestmentTypeAxis
= us-gaap_HedgeFundsMember
/ axs_RedemptionRestrictionTypeAxis
= axs_LockupRedemptionRestrictionMember
11.00%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
6,000,000axs_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareRedemptionRestriction
/ us-gaap_InvestmentTypeAxis
= us-gaap_HedgeFundsMember
/ axs_RedemptionRestrictionTypeAxis
= axs_OtherRedemptionRestrictionMember
 
Long/short equity funds [Member]      
Other Investments [Line Items]      
Other investments 242,096,000us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= us-gaap_HedgeFundsEquityLongShortMember
298,907,000us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= us-gaap_HedgeFundsEquityLongShortMember
 
Percentage of total fair value 26.00%axs_AlternativeInvestmentsFairValueDisclosurePercentageOfTotal
/ us-gaap_InvestmentTypeAxis
= us-gaap_HedgeFundsEquityLongShortMember
31.00%axs_AlternativeInvestmentsFairValueDisclosurePercentageOfTotal
/ us-gaap_InvestmentTypeAxis
= us-gaap_HedgeFundsEquityLongShortMember
 
Redemption frequency Quarterly, Semi-annually 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 336,342,000us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= us-gaap_HedgeFundsMultistrategyMember
324,020,000us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= us-gaap_HedgeFundsMultistrategyMember
 
Percentage of total fair value 36.00%axs_AlternativeInvestmentsFairValueDisclosurePercentageOfTotal
/ us-gaap_InvestmentTypeAxis
= us-gaap_HedgeFundsMultistrategyMember
34.00%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 29,000,000us-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 189,212,000us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= us-gaap_HedgeFundsEventDrivenMember
185,899,000us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= us-gaap_HedgeFundsEventDrivenMember
 
Percentage of total fair value 20.00%axs_AlternativeInvestmentsFairValueDisclosurePercentageOfTotal
/ us-gaap_InvestmentTypeAxis
= us-gaap_HedgeFundsEventDrivenMember
19.00%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 9,616,000us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= axs_HedgeFundsLeveragedBankLoansMember
9,713,000us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= axs_HedgeFundsLeveragedBankLoansMember
 
Percentage of total fair value 1.00%axs_AlternativeInvestmentsFairValueDisclosurePercentageOfTotal
/ us-gaap_InvestmentTypeAxis
= axs_HedgeFundsLeveragedBankLoansMember
1.00%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 69,682,000us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= axs_DirectLendingFundsMember
54,438,000us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= axs_DirectLendingFundsMember
 
Percentage of total fair value 7.00%axs_AlternativeInvestmentsFairValueDisclosurePercentageOfTotal
/ us-gaap_InvestmentTypeAxis
= axs_DirectLendingFundsMember
6.00%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 69,682,000axs_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareRedemptionRestriction
/ us-gaap_InvestmentTypeAxis
= axs_DirectLendingFundsMember
/ axs_RedemptionRestrictionTypeAxis
= axs_OtherRedemptionRestrictionMember
54,438,000axs_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareRedemptionRestriction
/ us-gaap_InvestmentTypeAxis
= axs_DirectLendingFundsMember
/ axs_RedemptionRestrictionTypeAxis
= axs_OtherRedemptionRestrictionMember
 
Percentage of fair value of other investments subject to redemption restrictions 7.00%us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareRedemptionRestrictionPercentage
/ us-gaap_InvestmentTypeAxis
= axs_DirectLendingFundsMember
/ axs_RedemptionRestrictionTypeAxis
= axs_OtherRedemptionRestrictionMember
6.00%us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareRedemptionRestrictionPercentage
/ us-gaap_InvestmentTypeAxis
= axs_DirectLendingFundsMember
/ axs_RedemptionRestrictionTypeAxis
= axs_OtherRedemptionRestrictionMember
 
Unfunded commitments related to other investments 72,000,000us-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 92,058,000us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= axs_CloEquityTranchedSecuritiesMember
92,488,000us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= axs_CloEquityTranchedSecuritiesMember
 
Percentage of total fair value 10.00%axs_AlternativeInvestmentsFairValueDisclosurePercentageOfTotal
/ us-gaap_InvestmentTypeAxis
= axs_CloEquityTranchedSecuritiesMember
9.00%axs_AlternativeInvestmentsFairValueDisclosurePercentageOfTotal
/ us-gaap_InvestmentTypeAxis
= axs_CloEquityTranchedSecuritiesMember
 
Real estate funds [Member]      
Other Investments [Line Items]      
Investment term 8 years    
Real estate funds [Member] | Other Redemption Restriction [Member]      
Other Investments [Line Items]      
Unfunded commitments related to other investments $ 100,000,000us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
/ us-gaap_InvestmentTypeAxis
= us-gaap_RealEstateFundsMember
/ axs_RedemptionRestrictionTypeAxis
= axs_OtherRedemptionRestrictionMember
   
Commitment period 3 years