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INVESTMENTS (DETAILS 10) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Restricted Investments [Line Items]
Collateral in Trust for inter-company agreements	$ 2,792,461axs_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesForIntercompanyInsuranceAndReinsuranceAgreements	$ 2,261,081axs_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesForIntercompanyInsuranceAndReinsuranceAgreements
Collateral for secured letter of credit facility	468,923us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesForLetterOfCreditFacilities	777,828us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesForLetterOfCreditFacilities
Collateral in Trust for third party agreements	567,060axs_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesForThirdPartyInsuranceAndReinsuranceAgreements	276,839axs_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesForThirdPartyInsuranceAndReinsuranceAgreements
Securities on deposit with regulatory authorities	58,476us-gaap_AssetsHeldByInsuranceRegulators	58,327us-gaap_AssetsHeldByInsuranceRegulators
Total restricted investments	3,886,920us-gaap_AvailableForSaleSecuritiesRestricted	3,374,075us-gaap_AvailableForSaleSecuritiesRestricted
Lloyd's [Member]
Restricted Investments [Line Items]
Collateral in Trust for third party agreements	$ 245,000axs_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesForThirdPartyInsuranceAndReinsuranceAgreements / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = axs_LloydsMember

X

- Definition

The carrying amount as of the date of the latest financial statement presented of securities which are owned but transferred to serve as collateral for inter-company insurance and reinsurance agreements, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party.

+ References

No definition available.

+ Details

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X

- Definition

The carrying amount as of the date of the latest financial statement presented of securities which are owned but transferred to serve as collateral for insurance and reinsurance agreements with third parties, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party.

+ References

No definition available.

+ Details

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- Definition

Carrying amount of cash and investment securities on deposit with state regulatory authorities in connection with capital requirements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 320

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=28366721&loc=d3e22002-158495

+ Details

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X

- Definition

The carrying amount of securities categorized neither as held-to-maturity nor trading which serve as security for borrowings or other arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 6

-Article 9



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph b

-Article 4



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5086-111524



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX210.4-08(b))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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- Definition

The carrying amount as of the date of the latest financial statement presented of securities which are owned but transferred to serve as collateral for letter of credit arrangements, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 30

-Section 50

-Paragraph 1A

-Subparagraph (b)(1)(i)

-URI http://asc.fasb.org/extlink&oid=34720971&loc=SL6224234-111729

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