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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 | $ 884,000,000 us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount | $ 766,000,000 us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount | $ 697,000,000 us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount
Bermuda [Member] |  |  |
Statutory Financial Information [Line Items] |  |  |
Required statutory capital and surplus | 1,972,951,000 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusRequired / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = country_BM | 1,996,794,000 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusRequired / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = country_BM |
Available statutory capital and surplus | 3,729,925,000 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = country_BM | 3,839,840,000 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = country_BM |
Minimum solvency margin amount | 100,000,000 axs_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 | 2 axs_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsNumberOfDirectorAffadavitsRequiredToPayGreaterAmount / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = country_BM |  |
Maximum dividend/distribution payable without regulatory approval | 932,000,000 us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithoutRegulatoryApproval / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = country_BM |  |
Ireland [Member] |  |  |
Statutory Financial Information [Line Items] |  |  |
Required statutory capital and surplus | 299,758,000 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusRequired / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = country_IE | 315,258,000 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusRequired / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = country_IE |
Available statutory capital and surplus | 788,882,000 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = country_IE | 792,427,000 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = country_IE |
Maximum dividend/distribution payable with regulatory approval | 177,000,000 us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithRegulatoryApproval / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = country_IE |  |
United States [Member] |  |  |
Statutory Financial Information [Line Items] |  |  |
Required statutory capital and surplus | 415,011,000 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusRequired / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = country_US | 385,651,000 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusRequired / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = country_US |
Available statutory capital and surplus | 1,443,032,000 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = country_US | 1,348,861,000 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = country_US |
Maximum dividend/distribution payable without regulatory approval | $ 144,000,000 us-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 |  |

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- Definition The minimum solvency margin amount, which is a factor of the minimum statutory capital and surplus calculation, required to be maintained, in terms of the Insurance Act 1978, amendments thereto and Related Regulations of Bermuda. + References No definition available. + Details
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- Definition The minimum solvency margin amount, which is a factor of the minimum statutory capital and surplus calculation, (expressed as a percentage of net reserve for losses and loss adjustment expenses) required to be maintained, in terms of the Insurance Act 1978, amendments thereto and Related Regulations of Bermuda. + References No definition available. + Details
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- Definition The minimum solvency margin amount, which is a factor of the minimum statutory capital and surplus calculation, (expressed as a percentage of net written premiums) required to be maintained, in terms of the Insurance Act 1978, amendments thereto and Related Regulations of Bermuda. + References No definition available. + Details
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- Definition The potential limit (expressed as a percentage of prior year total statutory capital and surplus) to the dividend/distribution that may be paid, without signed affidavits from the entity's directors attesting that a dividend and/or distribution in excess of this amount would not cause the entity to fail to meet its relevant margins. + References No definition available. + Details
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- Definition The number of the entity's directors required to issue signed affidavits in order to pay a dividend and/or distribution in excess of a specified percentage. The directors must attest that the dividend and/or distribution would not cause the entity to fail to meet its relevant margins. + References No definition available. + Details
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- Definition The potential limit (expressed as a percentage of total statutory capital and surplus) to the dividend that may be paid. + References No definition available. + Details
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- Definition Amount of dividends that can be declared or paid without approval of regulatory agency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph e -Article 4 + Details
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- Definition Amount of dividends that can be declared or paid with approval of regulatory agency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph e -Article 4 + Details
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- Definition The amount of statutory capital and surplus (stockholders' equity) as of the balance sheet date using prescribed or permitted statutory accounting practices (rather than GAAP, if different) of the state or country. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.23(c)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6486098&loc=d3e24708-158529 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 24 -Subparagraph c -Article 7 + Details
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- Definition Amount of statutory capital required to be maintained as of the balance sheet date under prescribed or permitted statutory accounting practices. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6486098&loc=d3e24708-158529 + Details
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