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REINSURANCE (DETAILS) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Premiums written:                      
Gross                 $ 4,711,519,000us-gaap_PremiumsWrittenGross $ 4,697,041,000us-gaap_PremiumsWrittenGross $ 4,139,643,000us-gaap_PremiumsWrittenGross
Ceded                 (804,544,000)us-gaap_CededPremiumsWritten (768,841,000)us-gaap_CededPremiumsWritten (802,187,000)us-gaap_CededPremiumsWritten
Net                 3,906,975,000us-gaap_PremiumsWrittenNet 3,928,200,000us-gaap_PremiumsWrittenNet 3,337,456,000us-gaap_PremiumsWrittenNet
Premiums earned:                      
Gross                 4,652,345,000axs_PremiumsEarnedGross 4,459,269,000axs_PremiumsEarnedGross 4,141,037,000axs_PremiumsEarnedGross
Ceded                 (781,346,000)us-gaap_CededPremiumsEarned (752,204,000)us-gaap_CededPremiumsEarned (725,574,000)us-gaap_CededPremiumsEarned
Net 958,517,000us-gaap_PremiumsEarnedNet 966,138,000us-gaap_PremiumsEarnedNet 1,000,400,000us-gaap_PremiumsEarnedNet 945,949,000us-gaap_PremiumsEarnedNet 941,911,000us-gaap_PremiumsEarnedNet 945,242,000us-gaap_PremiumsEarnedNet 945,873,000us-gaap_PremiumsEarnedNet 874,039,000us-gaap_PremiumsEarnedNet 3,870,999,000us-gaap_PremiumsEarnedNet 3,707,065,000us-gaap_PremiumsEarnedNet 3,415,463,000us-gaap_PremiumsEarnedNet
Reinsurance receivables:                      
Ceded losses and loss expenses                 401,000,000us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded 415,000,000us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded 396,000,000us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded
Provision for unrecoverable reinsurance $ 18,000,000us-gaap_ReinsuranceRecoverablesAllowance       $ 18,000,000us-gaap_ReinsuranceRecoverablesAllowance       $ 18,000,000us-gaap_ReinsuranceRecoverablesAllowance $ 18,000,000us-gaap_ReinsuranceRecoverablesAllowance  
AM Best A minus Or Better Rating [Member] | Gross Reinsurance Recoverable [Member]                      
Concentration Risk [Line Items]                      
Percentage of gross reinsurance recoverables collectible from reinsurers rated A- or better by A.M. Best                 98.50%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= axs_GrossReinsuranceRecoverableMember
/ us-gaap_CreditRatingAMBestAxis
= axs_AMBestAminusOrBetterRatingMember		 98.80%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= axs_GrossReinsuranceRecoverableMember
/ us-gaap_CreditRatingAMBestAxis
= axs_AMBestAminusOrBetterRatingMember