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STATUTORY FINANCIAL INFORMATION (DETAILS) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Statutory Financial Information [Line Items]      
Statutory net income $ 884,000,000us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount $ 766,000,000us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount $ 697,000,000us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount
Bermuda [Member]      
Statutory Financial Information [Line Items]      
Required statutory capital and surplus 1,972,951,000us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusRequired
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= country_BM
1,996,794,000us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusRequired
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= country_BM
 
Available statutory capital and surplus 3,729,925,000us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= country_BM
3,839,840,000us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= country_BM
 
Minimum solvency margin amount 100,000,000axs_StatutoryAccountingPracticesMinimumSolvencyMarginAmount
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= country_BM
   
Minimum solvency margin percentage of net written premiums 50.00%axs_StatutoryAccountingPracticesMinimumSolvencyMarginPercentageOfNetWrittenPremiums
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= country_BM
   
Minimum solvency margin percentage of net reserves 15.00%axs_StatutoryAccountingPracticesMinimumSolvencyMarginPercentageOfNetReserves
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= country_BM
   
Limit - prior year's total statutory capital surplus (Bermuda) 25.00%axs_StatutoryAccountingPracticesStatutoryAmountAvaialableForDividendOrDistributionPaymentsPotentialLimitPercentageOfPriorYearStatutoryCapitalAndSurplus
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= country_BM
   
Number of directors required to sign affadavit in order to pay dividend/distribution greater than 25% of prior year statutory capital and surplus 2axs_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsNumberOfDirectorAffadavitsRequiredToPayGreaterAmount
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= country_BM
   
Maximum dividend/distribution payable without regulatory approval 932,000,000us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithoutRegulatoryApproval
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= country_BM
   
Ireland [Member]      
Statutory Financial Information [Line Items]      
Required statutory capital and surplus 299,758,000us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusRequired
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= country_IE
315,258,000us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusRequired
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= country_IE
 
Available statutory capital and surplus 788,882,000us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= country_IE
792,427,000us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= country_IE
 
Maximum dividend/distribution payable with regulatory approval 177,000,000us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithRegulatoryApproval
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= country_IE
   
United States [Member]      
Statutory Financial Information [Line Items]      
Required statutory capital and surplus 415,011,000us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusRequired
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= country_US
385,651,000us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusRequired
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= country_US
 
Available statutory capital and surplus 1,443,032,000us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= country_US
1,348,861,000us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= country_US
 
Maximum dividend/distribution payable without regulatory approval $ 144,000,000us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithoutRegulatoryApproval
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= country_US
   
Maximum dividend limit - percentage of total statutory capital and surplus 10.00%axs_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsPotentialLimitPercentageOfTotalStatutoryCapitalAndSurplus
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= country_US