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NONCONTROLLING INTERESTS (DETAILS) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Noncontrolling Interest [Line Items]
Decrease from return of capital to noncontrolling interests	$ (40,000)us-gaap_MinorityInterestDecreaseFromRedemptions	$ 0us-gaap_MinorityInterestDecreaseFromRedemptions
Increase from issuance of preferred equity to noncontrolling interests	56,991us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance	0us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance
Assets	20,458,819us-gaap_Assets		19,955,736us-gaap_Assets
Liabilities	14,412,584us-gaap_Liabilities		14,075,796us-gaap_Liabilities
Change in Noncontrolling Interest [Roll Forward]
Balance at beginning of period	58,819us-gaap_NoncontrollingInterestInVariableInterestEntity	50,000us-gaap_NoncontrollingInterestInVariableInterestEntity
Increase from issuance of preferred equity to noncontrolling interests	56,991us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance	0us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance
Decrease from return of capital to noncontrolling interests	(40,000)us-gaap_MinorityInterestDecreaseFromRedemptions	0us-gaap_MinorityInterestDecreaseFromRedemptions
Amounts attributable to (from) noncontrolling interests	(4,873)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	1,222us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Foreign currency translation adjustment attributable to (from) noncontrolling interests	(1,865)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest	0us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest
Balance at end of period	69,072us-gaap_NoncontrollingInterestInVariableInterestEntity	51,222us-gaap_NoncontrollingInterestInVariableInterestEntity
Ventures Re [Member]
Noncontrolling Interest [Line Items]
Decrease from return of capital to noncontrolling interests	(40,000)us-gaap_MinorityInterestDecreaseFromRedemptions / dei_LegalEntityAxis = axs_VenturesReMember
Increase from issuance of preferred equity to noncontrolling interests	57,000us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance / dei_LegalEntityAxis = axs_VenturesReMember
Assets	120,000us-gaap_Assets / dei_LegalEntityAxis = axs_VenturesReMember		97,000us-gaap_Assets / dei_LegalEntityAxis = axs_VenturesReMember
Liabilities	50,000us-gaap_Liabilities / dei_LegalEntityAxis = axs_VenturesReMember		38,000us-gaap_Liabilities / dei_LegalEntityAxis = axs_VenturesReMember
Change in Noncontrolling Interest [Roll Forward]
Increase from issuance of preferred equity to noncontrolling interests	57,000us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance / dei_LegalEntityAxis = axs_VenturesReMember
Decrease from return of capital to noncontrolling interests	$ (40,000)us-gaap_MinorityInterestDecreaseFromRedemptions / dei_LegalEntityAxis = axs_VenturesReMember

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.

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Amount of Net Income (Loss) attributable to noncontrolling interest.

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Portion of equity (net assets) in a variable interest entity (VIE) not attributable, directly or indirectly, to the parent entity. That is, this is the portion of equity in a VIE that is attributable to the noncontrolling interest (previously referred to as minority interest).

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature, attributable to noncontrolling interests.

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