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v2.4.1.9

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
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Ternian [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Acquired intangible assets | $ 13 us-gaap_IntangibleAssetsGrossExcludingGoodwill / us-gaap_BusinessAcquisitionAxis = axs_TernianInsuranceGroupLLCMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
PartnerRe [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Business Acquisition, Share Price |  |  |  | $ 130.00 axs_BusinessAcquisitionSharePriceUnsolicitedThirdPartyProposal / us-gaap_BusinessAcquisitionAxis = axs_PartnerReMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Special Dividend |  | $ 11.50 axs_SpecialDividend / us-gaap_BusinessAcquisitionAxis = axs_PartnerReMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |
Termination Fee |  | $ 280 axs_TerminationFee / us-gaap_BusinessAcquisitionAxis = axs_PartnerReMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | $ 250 axs_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

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- 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

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- 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

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