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COMMITMENTS AND CONTINGENCIES (DETAILS 2) | 12 Months Ended
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Dec. 31, 2014 broker | Dec. 31, 2013 | Dec. 31, 2012
Reinsurance Recoverable On Unpaid And Paid Losses [Member] | Credit Risk Concentration [Member] | Reinsurer 1 [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage of total | 13.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_CededCreditRiskAxis = axs_ReinsurerOneMember / us-gaap_ConcentrationRiskByBenchmarkAxis = axs_ReinsuranceRecoverablesMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CreditConcentrationRiskMember | 14.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_CededCreditRiskAxis = axs_ReinsurerOneMember / us-gaap_ConcentrationRiskByBenchmarkAxis = axs_ReinsuranceRecoverablesMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CreditConcentrationRiskMember |
Reinsurance Recoverable On Unpaid And Paid Losses [Member] | Credit Risk Concentration [Member] | Reinsurer 2 [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage of total | 11.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_CededCreditRiskAxis = axs_ReinsurerTwoMember / us-gaap_ConcentrationRiskByBenchmarkAxis = axs_ReinsuranceRecoverablesMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CreditConcentrationRiskMember | 11.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_CededCreditRiskAxis = axs_ReinsurerTwoMember / us-gaap_ConcentrationRiskByBenchmarkAxis = axs_ReinsuranceRecoverablesMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CreditConcentrationRiskMember |
Reinsurance Recoverable On Unpaid And Paid Losses [Member] | Credit Risk Concentration [Member] | Reinsurer 3 [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage of total | 11.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_CededCreditRiskAxis = axs_ReinsurerThreeMember / us-gaap_ConcentrationRiskByBenchmarkAxis = axs_ReinsuranceRecoverablesMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CreditConcentrationRiskMember | 11.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_CededCreditRiskAxis = axs_ReinsurerThreeMember / us-gaap_ConcentrationRiskByBenchmarkAxis = axs_ReinsuranceRecoverablesMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CreditConcentrationRiskMember |
Reinsurance Recoverable On Unpaid And Paid Losses [Member] | Credit Risk Concentration [Member] | Top Ten Reinsurers [Member] | AM Best, A+ Rating [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage of total | 77.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_CededCreditRiskAxis = axs_TenLargestReinsurersMember / us-gaap_ConcentrationRiskByBenchmarkAxis = axs_ReinsuranceRecoverablesMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CreditConcentrationRiskMember / us-gaap_CreditRatingAMBestAxis = us-gaap_AMBestAPlusRatingMember | 77.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_CededCreditRiskAxis = axs_TenLargestReinsurersMember / us-gaap_ConcentrationRiskByBenchmarkAxis = axs_ReinsuranceRecoverablesMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CreditConcentrationRiskMember / us-gaap_CreditRatingAMBestAxis = us-gaap_AMBestAPlusRatingMember |
Gross Premiums Written [Member] | Customer Concentration [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage of total | 56.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = axs_PremiumsWrittenGrossMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember | 61.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = axs_PremiumsWrittenGrossMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember | 61.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = axs_PremiumsWrittenGrossMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember
Concentration risk, number of brokers exceeding threshold | 3 axs_SegmentReportingDisclosureOfMajorCustomersNumberOfMajorCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = axs_PremiumsWrittenGrossMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember |  |
Gross Premiums Written [Member] | Customer Concentration [Member] | Aon Corporation [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage of total | 22.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = axs_PremiumsWrittenGrossMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = axs_AonCorporationMember | 26.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = axs_PremiumsWrittenGrossMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = axs_AonCorporationMember | 27.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = axs_PremiumsWrittenGrossMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = axs_AonCorporationMember
Gross Premiums Written [Member] | Customer Concentration [Member] | Marsh, Inc. [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage of total | 22.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = axs_PremiumsWrittenGrossMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = axs_MarshIncMember | 23.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = axs_PremiumsWrittenGrossMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = axs_MarshIncMember | 22.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = axs_PremiumsWrittenGrossMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = axs_MarshIncMember
Gross Premiums Written [Member] | Customer Concentration [Member] | Willis Group Holdings Ltd. [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage of total | 12.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = axs_PremiumsWrittenGrossMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = axs_WillisGroupHoldingsLtdMember | 12.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = axs_PremiumsWrittenGrossMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = axs_WillisGroupHoldingsLtdMember | 12.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = axs_PremiumsWrittenGrossMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = axs_WillisGroupHoldingsLtdMember

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