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COMMITMENTS AND CONTINGENCIES (DETAILS 2) (PartnerRe [Member], Subsequent Event [Member], USD $)
In Millions, except Per Share data, unless otherwise specified
May 03, 2015
May 02, 2015
Business Acquisition [Line Items]    
Special Dividend $ 11.50axs_SpecialDividend  
Termination Fee $ 280axs_TerminationFee $ 250axs_TerminationFee
Scenario, Forecast [Member]
    
Business Acquisition [Line Items]    
Special Dividend $ 11.50axs_SpecialDividend
/ us-gaap_BusinessAcquisitionAxis
= axs_PartnerReMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		  
No Approval Fee 55axs_NoApprovalFee
/ us-gaap_BusinessAcquisitionAxis
= axs_PartnerReMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		  
Termination Fee 280axs_TerminationFee
/ us-gaap_BusinessAcquisitionAxis
= axs_PartnerReMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		  
Amalgamation Costs And Expenses Reimbursement 35axs_AmalgamationCostsAndExpensesReimbursement
/ us-gaap_BusinessAcquisitionAxis
= axs_PartnerReMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		  
Financial advisor amalgamation fee $ 20us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
/ us-gaap_BusinessAcquisitionAxis
= axs_PartnerReMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember