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COMMITMENTS AND CONTINGENCIES (DETAILS 2)	12 Months Ended
	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	3axs_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

X

- Definition

Number of customers where transactions amount to 10 percent or more of the entity's revenues.

+ References

No definition available.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

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-Section 50

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