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SCHEDULE III - SUPPLEMENTARY INSURANCE INFORMATION (DETAILS) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Supplementary Insurance Information [Line Items] |  |  |
Deferred Acquisition Costs | $ 466,987 us-gaap_SupplementaryInsuranceInformationDeferredPolicyAcquisitionCosts | $ 456,122 us-gaap_SupplementaryInsuranceInformationDeferredPolicyAcquisitionCosts | $ 389,248 us-gaap_SupplementaryInsuranceInformationDeferredPolicyAcquisitionCosts
Reserve for Losses and Loss Expenses | 9,596,797 us-gaap_SupplementaryInsuranceInformationLiabilityForFuturePolicyBenefitsLossesClaimsAndLossExpenseReserves | 9,582,140 us-gaap_SupplementaryInsuranceInformationLiabilityForFuturePolicyBenefitsLossesClaimsAndLossExpenseReserves | 9,058,731 us-gaap_SupplementaryInsuranceInformationLiabilityForFuturePolicyBenefitsLossesClaimsAndLossExpenseReserves
Unearned Premiums | 2,735,376 us-gaap_SupplementaryInsuranceInformationUnearnedPremiums | 2,683,849 us-gaap_SupplementaryInsuranceInformationUnearnedPremiums | 2,454,692 us-gaap_SupplementaryInsuranceInformationUnearnedPremiums
Net Premiums Earned | 3,870,999 us-gaap_SupplementaryInsuranceInformationPremiumRevenue | 3,707,065 us-gaap_SupplementaryInsuranceInformationPremiumRevenue | 3,415,463 us-gaap_SupplementaryInsuranceInformationPremiumRevenue
Net Investment Income | 342,766 us-gaap_SupplementaryInsuranceInformationNetInvestmentIncome | 409,312 us-gaap_SupplementaryInsuranceInformationNetInvestmentIncome | 380,957 us-gaap_SupplementaryInsuranceInformationNetInvestmentIncome
Losses and Loss Expenses | 2,186,722 us-gaap_SupplementaryInsuranceInformationBenefitsClaimsLossesAndSettlementExpense | 2,134,195 us-gaap_SupplementaryInsuranceInformationBenefitsClaimsLossesAndSettlementExpense | 2,096,028 us-gaap_SupplementaryInsuranceInformationBenefitsClaimsLossesAndSettlementExpense
Amortization of Deferred Acquisition Costs | 737,197 us-gaap_SupplementaryInsuranceInformationAmortizationOfDeferredPolicyAcquisitionCosts | 664,191 us-gaap_SupplementaryInsuranceInformationAmortizationOfDeferredPolicyAcquisitionCosts | 627,653 us-gaap_SupplementaryInsuranceInformationAmortizationOfDeferredPolicyAcquisitionCosts
Other Operating Expenses | 621,876 us-gaap_SupplementaryInsuranceInformationOtherOperatingExpense | 575,390 us-gaap_SupplementaryInsuranceInformationOtherOperatingExpense | 560,981 us-gaap_SupplementaryInsuranceInformationOtherOperatingExpense
Net Premiums Written | 3,906,975 us-gaap_SupplementaryInsuranceInformationPremiumsWritten | 3,928,200 us-gaap_SupplementaryInsuranceInformationPremiumsWritten | 3,337,456 us-gaap_SupplementaryInsuranceInformationPremiumsWritten
Insurance [Member] |  |  |
Supplementary Insurance Information [Line Items] |  |  |
Deferred Acquisition Costs | 135,111 us-gaap_SupplementaryInsuranceInformationDeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember | 150,109 us-gaap_SupplementaryInsuranceInformationDeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember | 128,311 us-gaap_SupplementaryInsuranceInformationDeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember
Reserve for Losses and Loss Expenses | 5,063,147 us-gaap_SupplementaryInsuranceInformationLiabilityForFuturePolicyBenefitsLossesClaimsAndLossExpenseReserves / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember | 4,873,184 us-gaap_SupplementaryInsuranceInformationLiabilityForFuturePolicyBenefitsLossesClaimsAndLossExpenseReserves / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember | 4,492,553 us-gaap_SupplementaryInsuranceInformationLiabilityForFuturePolicyBenefitsLossesClaimsAndLossExpenseReserves / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember
Unearned Premiums | 1,506,925 us-gaap_SupplementaryInsuranceInformationUnearnedPremiums / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember | 1,548,653 us-gaap_SupplementaryInsuranceInformationUnearnedPremiums / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember | 1,456,318 us-gaap_SupplementaryInsuranceInformationUnearnedPremiums / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember
Net Premiums Earned | 1,830,544 us-gaap_SupplementaryInsuranceInformationPremiumRevenue / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember | 1,722,762 us-gaap_SupplementaryInsuranceInformationPremiumRevenue / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember | 1,558,058 us-gaap_SupplementaryInsuranceInformationPremiumRevenue / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember
Net Investment Income | 0 us-gaap_SupplementaryInsuranceInformationNetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember | 0 us-gaap_SupplementaryInsuranceInformationNetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember | 0 us-gaap_SupplementaryInsuranceInformationNetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember
Losses and Loss Expenses | 1,131,880 us-gaap_SupplementaryInsuranceInformationBenefitsClaimsLossesAndSettlementExpense / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember | 1,050,402 us-gaap_SupplementaryInsuranceInformationBenefitsClaimsLossesAndSettlementExpense / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember | 953,564 us-gaap_SupplementaryInsuranceInformationBenefitsClaimsLossesAndSettlementExpense / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember
Amortization of Deferred Acquisition Costs | 278,804 us-gaap_SupplementaryInsuranceInformationAmortizationOfDeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember | 242,363 us-gaap_SupplementaryInsuranceInformationAmortizationOfDeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember | 226,859 us-gaap_SupplementaryInsuranceInformationAmortizationOfDeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember
Other Operating Expenses | 341,214 us-gaap_SupplementaryInsuranceInformationOtherOperatingExpense / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember | 347,684 us-gaap_SupplementaryInsuranceInformationOtherOperatingExpense / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember | 314,834 us-gaap_SupplementaryInsuranceInformationOtherOperatingExpense / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember
Net Premiums Written | 1,779,501 us-gaap_SupplementaryInsuranceInformationPremiumsWritten / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember | 1,813,538 us-gaap_SupplementaryInsuranceInformationPremiumsWritten / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember | 1,522,245 us-gaap_SupplementaryInsuranceInformationPremiumsWritten / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember
Reinsurance [Member] |  |  |
Supplementary Insurance Information [Line Items] |  |  |
Deferred Acquisition Costs | 331,876 us-gaap_SupplementaryInsuranceInformationDeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember | 306,013 us-gaap_SupplementaryInsuranceInformationDeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember | 260,937 us-gaap_SupplementaryInsuranceInformationDeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember
Reserve for Losses and Loss Expenses | 4,533,650 us-gaap_SupplementaryInsuranceInformationLiabilityForFuturePolicyBenefitsLossesClaimsAndLossExpenseReserves / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember | 4,708,956 us-gaap_SupplementaryInsuranceInformationLiabilityForFuturePolicyBenefitsLossesClaimsAndLossExpenseReserves / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember | 4,566,178 us-gaap_SupplementaryInsuranceInformationLiabilityForFuturePolicyBenefitsLossesClaimsAndLossExpenseReserves / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember
Unearned Premiums | 1,228,451 us-gaap_SupplementaryInsuranceInformationUnearnedPremiums / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember | 1,135,196 us-gaap_SupplementaryInsuranceInformationUnearnedPremiums / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember | 998,374 us-gaap_SupplementaryInsuranceInformationUnearnedPremiums / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember
Net Premiums Earned | 2,040,455 us-gaap_SupplementaryInsuranceInformationPremiumRevenue / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember | 1,984,303 us-gaap_SupplementaryInsuranceInformationPremiumRevenue / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember | 1,857,405 us-gaap_SupplementaryInsuranceInformationPremiumRevenue / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember
Net Investment Income | 0 us-gaap_SupplementaryInsuranceInformationNetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember | 0 us-gaap_SupplementaryInsuranceInformationNetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember | 0 us-gaap_SupplementaryInsuranceInformationNetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember
Losses and Loss Expenses | 1,054,842 us-gaap_SupplementaryInsuranceInformationBenefitsClaimsLossesAndSettlementExpense / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember | 1,083,793 us-gaap_SupplementaryInsuranceInformationBenefitsClaimsLossesAndSettlementExpense / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember | 1,142,464 us-gaap_SupplementaryInsuranceInformationBenefitsClaimsLossesAndSettlementExpense / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember
Amortization of Deferred Acquisition Costs | 458,393 us-gaap_SupplementaryInsuranceInformationAmortizationOfDeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember | 421,828 us-gaap_SupplementaryInsuranceInformationAmortizationOfDeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember | 400,794 us-gaap_SupplementaryInsuranceInformationAmortizationOfDeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember
Other Operating Expenses | 144,987 us-gaap_SupplementaryInsuranceInformationOtherOperatingExpense / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember | 137,450 us-gaap_SupplementaryInsuranceInformationOtherOperatingExpense / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember | 116,487 us-gaap_SupplementaryInsuranceInformationOtherOperatingExpense / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember
Net Premiums Written | 2,127,474 us-gaap_SupplementaryInsuranceInformationPremiumsWritten / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember | 2,114,662 us-gaap_SupplementaryInsuranceInformationPremiumsWritten / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember | 1,815,211 us-gaap_SupplementaryInsuranceInformationPremiumsWritten / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember
Corporate, Non-Segment [Member] |  |  |
Supplementary Insurance Information [Line Items] |  |  |
Deferred Acquisition Costs | 0 us-gaap_SupplementaryInsuranceInformationDeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember | 0 us-gaap_SupplementaryInsuranceInformationDeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember | 0 us-gaap_SupplementaryInsuranceInformationDeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember
Reserve for Losses and Loss Expenses | 0 us-gaap_SupplementaryInsuranceInformationLiabilityForFuturePolicyBenefitsLossesClaimsAndLossExpenseReserves / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember | 0 us-gaap_SupplementaryInsuranceInformationLiabilityForFuturePolicyBenefitsLossesClaimsAndLossExpenseReserves / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember | 0 us-gaap_SupplementaryInsuranceInformationLiabilityForFuturePolicyBenefitsLossesClaimsAndLossExpenseReserves / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember
Unearned Premiums | 0 us-gaap_SupplementaryInsuranceInformationUnearnedPremiums / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember | 0 us-gaap_SupplementaryInsuranceInformationUnearnedPremiums / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember | 0 us-gaap_SupplementaryInsuranceInformationUnearnedPremiums / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember
Net Premiums Earned | 0 us-gaap_SupplementaryInsuranceInformationPremiumRevenue / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember | 0 us-gaap_SupplementaryInsuranceInformationPremiumRevenue / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember | 0 us-gaap_SupplementaryInsuranceInformationPremiumRevenue / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember
Net Investment Income | 342,766 us-gaap_SupplementaryInsuranceInformationNetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember | 409,312 us-gaap_SupplementaryInsuranceInformationNetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember | 380,957 us-gaap_SupplementaryInsuranceInformationNetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember
Losses and Loss Expenses | 0 us-gaap_SupplementaryInsuranceInformationBenefitsClaimsLossesAndSettlementExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember | 0 us-gaap_SupplementaryInsuranceInformationBenefitsClaimsLossesAndSettlementExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember | 0 us-gaap_SupplementaryInsuranceInformationBenefitsClaimsLossesAndSettlementExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember
Amortization of Deferred Acquisition Costs | 0 us-gaap_SupplementaryInsuranceInformationAmortizationOfDeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember | 0 us-gaap_SupplementaryInsuranceInformationAmortizationOfDeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember | 0 us-gaap_SupplementaryInsuranceInformationAmortizationOfDeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember
Other Operating Expenses | 135,675 us-gaap_SupplementaryInsuranceInformationOtherOperatingExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember | 90,256 us-gaap_SupplementaryInsuranceInformationOtherOperatingExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember | 129,660 us-gaap_SupplementaryInsuranceInformationOtherOperatingExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember
Net Premiums Written | $ 0 us-gaap_SupplementaryInsuranceInformationPremiumsWritten / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember | $ 0 us-gaap_SupplementaryInsuranceInformationPremiumsWritten / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember | $ 0 us-gaap_SupplementaryInsuranceInformationPremiumsWritten / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember

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- Definition Amount of amortization of deferred policy acquisition costs recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915 + Details
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- Definition Amount of insurance benefits, claims, losses and settlement expenses incurred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915 + Details
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- Definition Net amount of deferred policy acquisition costs capitalized on contracts remaining in force on the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915 + Details
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- Definition Amount of reserves for future policy claims payable and loss expenses to be incurred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915 + Details
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- Definition Amount of net investment income earned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915 + Details
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- Definition Amount of other operating expense incurred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915 + Details
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- Definition Amount of premium revenue earned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915 + Details
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- Definition Amount of actual written premiums, including, as applicable, premiums from reinsurance assumed and net of premiums on reinsurance ceded. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915 + Details
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