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RESERVE FOR LOSSES AND LOSS EXPENSES (DETAILS 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Additional Information Related to Net Incurred Losses [Line Items]
Current year net loss and loss expenses	$ 2,445,666us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense	$ 2,353,631us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense	$ 2,340,868us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense
Net favorable (adverse) prior year reserve development	258,944us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense	219,436us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense	244,840us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense
Short Tail Lines Insurance and Reinsurance Business [Member]
Additional Information Related to Net Incurred Losses [Line Items]
Net favorable (adverse) prior year reserve development	207,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_NoncatastrophicEventAxis = axs_ShortTailReservingClassInsuranceAndReinsuranceBusinessMember	162,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_NoncatastrophicEventAxis = axs_ShortTailReservingClassInsuranceAndReinsuranceBusinessMember	186,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_NoncatastrophicEventAxis = axs_ShortTailReservingClassInsuranceAndReinsuranceBusinessMember
Professional Lines Insurance and Reinsurance Business [Member]
Additional Information Related to Net Incurred Losses [Line Items]
Net favorable (adverse) prior year reserve development	32,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_NoncatastrophicEventAxis = axs_ProfessionalLinesInsuranceAndReinsuranceBusinessMember	(29,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_NoncatastrophicEventAxis = axs_ProfessionalLinesInsuranceAndReinsuranceBusinessMember	54,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_NoncatastrophicEventAxis = axs_ProfessionalLinesInsuranceAndReinsuranceBusinessMember
Professional Lines Insurance Business [Member]
Additional Information Related to Net Incurred Losses [Line Items]
Net favorable (adverse) prior year reserve development		(51,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_NoncatastrophicEventAxis = axs_ProfessionalLinesInsuranceBusinessMember
Liability Reinsurance Business [Member]
Additional Information Related to Net Incurred Losses [Line Items]
Net favorable (adverse) prior year reserve development	21,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_NoncatastrophicEventAxis = axs_LiabilityReinsuranceBusinessMember	85,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_NoncatastrophicEventAxis = axs_LiabilityReinsuranceBusinessMember
Liability Insurance Business [Member]
Additional Information Related to Net Incurred Losses [Line Items]
Net favorable (adverse) prior year reserve development	(23,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_NoncatastrophicEventAxis = axs_LiabilityInsuranceBusinessMember	(24,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_NoncatastrophicEventAxis = axs_LiabilityInsuranceBusinessMember
Motor Business [Member]
Additional Information Related to Net Incurred Losses [Line Items]
Net favorable (adverse) prior year reserve development	19,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_NoncatastrophicEventAxis = axs_MotorMember
Catastrophe and Weather-related Events [Member]
Additional Information Related to Net Incurred Losses [Line Items]
Current year net loss and loss expenses	$ 93,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = us-gaap_CatastropheMember	$ 201,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = us-gaap_CatastropheMember	$ 438,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = us-gaap_CatastropheMember

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