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SUBSEQUENT EVENTS (Details) (Subsequent Event [Member], USD $) In Millions, except Per Share data, unless otherwise specified	Apr. 01, 2015	May 03, 2015	May 02, 2015	Apr. 14, 2015
Ternian [Member]
Subsequent Event [Line Items]
Acquired intangible assets	$ 13us-gaap_IntangibleAssetsGrossExcludingGoodwill / us-gaap_BusinessAcquisitionAxis = axs_TernianInsuranceGroupLLCMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
PartnerRe [Member]
Subsequent Event [Line Items]
Business Acquisition, Share Price				$ 130.00axs_BusinessAcquisitionSharePriceUnsolicitedThirdPartyProposal / us-gaap_BusinessAcquisitionAxis = axs_PartnerReMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Special Dividend		$ 11.50axs_SpecialDividend / us-gaap_BusinessAcquisitionAxis = axs_PartnerReMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Termination Fee		$ 280axs_TerminationFee / us-gaap_BusinessAcquisitionAxis = axs_PartnerReMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember	$ 250axs_TerminationFee / us-gaap_BusinessAcquisitionAxis = axs_PartnerReMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

X

- Definition

Price of a single share of a number of saleable stocks offered to be paid in a business combination from an unsolicited proposal from a third party.

+ References

No definition available.

+ Details

Name:	axs_BusinessAcquisitionSharePriceUnsolicitedThirdPartyProposal
Namespace Prefix:	axs_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

One-time amalgamation related special dividend.

+ References

No definition available.

+ Details

Name:	axs_SpecialDividend
Namespace Prefix:	axs_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amalgamation termination related fee.

+ References

No definition available.

+ Details

Name:	axs_TerminationFee
Namespace Prefix:	axs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount before accumulated amortization of intangible assets, excluding goodwill.

+ References

No definition available.

+ Details

Name:	us-gaap_IntangibleAssetsGrossExcludingGoodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration