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DERIVATIVE INSTRUMENTS (DETAILS) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Derivative Fair Values on Consolidated Balance Sheet [Line Items]
Asset Derivative Fair Value	$ 7,264us-gaap_DerivativeAssets	$ 7,808us-gaap_DerivativeAssets
Liability Derivative Fair Value	18,329us-gaap_DerivativeLiabilities	1,967us-gaap_DerivativeLiabilities
Other Assets [Member]
Derivative Fair Values on Consolidated Balance Sheet [Line Items]
Asset Derivative Fair Value	7,264us-gaap_DerivativeAssets / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember	7,808us-gaap_DerivativeAssets / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember
Other Liabilities [Member]
Derivative Fair Values on Consolidated Balance Sheet [Line Items]
Liability Derivative Fair Value	18,329us-gaap_DerivativeLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember	1,967us-gaap_DerivativeLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember
Investment Portfolio [Member] | Foreign Exchange Forward Contracts [Member] | Not Designated as Hedging Instruments [Member]
Derivative Fair Values on Consolidated Balance Sheet [Line Items]
Derivative Notional Amount	161,678invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_InvestmentPortfolioMember	254,023invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_InvestmentPortfolioMember
Investment Portfolio [Member] | Foreign Exchange Forward Contracts [Member] | Other Assets [Member] | Not Designated as Hedging Instruments [Member]
Derivative Fair Values on Consolidated Balance Sheet [Line Items]
Asset Derivative Fair Value	3,925us-gaap_DerivativeAssets / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_InvestmentPortfolioMember	1,214us-gaap_DerivativeAssets / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_InvestmentPortfolioMember
Investment Portfolio [Member] | Foreign Exchange Forward Contracts [Member] | Other Liabilities [Member] | Not Designated as Hedging Instruments [Member]
Derivative Fair Values on Consolidated Balance Sheet [Line Items]
Liability Derivative Fair Value	12us-gaap_DerivativeLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_InvestmentPortfolioMember	1,032us-gaap_DerivativeLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_InvestmentPortfolioMember
Investment Portfolio [Member] | Interest Rate Swap [Member] | Not Designated as Hedging Instruments [Member]
Derivative Fair Values on Consolidated Balance Sheet [Line Items]
Derivative Notional Amount	140,000invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_InvestmentPortfolioMember	281,250invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_InvestmentPortfolioMember
Investment Portfolio [Member] | Interest Rate Swap [Member] | Other Assets [Member] | Not Designated as Hedging Instruments [Member]
Derivative Fair Values on Consolidated Balance Sheet [Line Items]
Asset Derivative Fair Value	0us-gaap_DerivativeAssets / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_InvestmentPortfolioMember	873us-gaap_DerivativeAssets / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_InvestmentPortfolioMember
Investment Portfolio [Member] | Interest Rate Swap [Member] | Other Liabilities [Member] | Not Designated as Hedging Instruments [Member]
Derivative Fair Values on Consolidated Balance Sheet [Line Items]
Liability Derivative Fair Value	248us-gaap_DerivativeLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_InvestmentPortfolioMember	0us-gaap_DerivativeLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_InvestmentPortfolioMember
Underwriting Portfolio [Member] | Foreign Exchange Forward Contracts [Member] | Not Designated as Hedging Instruments [Member]
Derivative Fair Values on Consolidated Balance Sheet [Line Items]
Derivative Notional Amount	577,836invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_UnderwritingPortfolioMember	390,663invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_UnderwritingPortfolioMember
Underwriting Portfolio [Member] | Foreign Exchange Forward Contracts [Member] | Other Assets [Member] | Not Designated as Hedging Instruments [Member]
Derivative Fair Values on Consolidated Balance Sheet [Line Items]
Asset Derivative Fair Value	3,228us-gaap_DerivativeAssets / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_UnderwritingPortfolioMember	4,737us-gaap_DerivativeAssets / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_UnderwritingPortfolioMember
Underwriting Portfolio [Member] | Foreign Exchange Forward Contracts [Member] | Other Liabilities [Member] | Not Designated as Hedging Instruments [Member]
Derivative Fair Values on Consolidated Balance Sheet [Line Items]
Liability Derivative Fair Value	2,781us-gaap_DerivativeLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_UnderwritingPortfolioMember	120us-gaap_DerivativeLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_UnderwritingPortfolioMember
Underwriting Portfolio [Member] | Weather Related Derivative [Member] | Not Designated as Hedging Instruments [Member]
Derivative Fair Values on Consolidated Balance Sheet [Line Items]
Derivative Notional Amount	58,124invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = axs_WeatherRelatedDerivativeMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_UnderwritingPortfolioMember	24,451invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = axs_WeatherRelatedDerivativeMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_UnderwritingPortfolioMember
Underwriting Portfolio [Member] | Weather Related Derivative [Member] | Other Assets [Member] | Not Designated as Hedging Instruments [Member]
Derivative Fair Values on Consolidated Balance Sheet [Line Items]
Asset Derivative Fair Value	111us-gaap_DerivativeAssets / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = axs_WeatherRelatedDerivativeMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_UnderwritingPortfolioMember	984us-gaap_DerivativeAssets / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = axs_WeatherRelatedDerivativeMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_UnderwritingPortfolioMember
Underwriting Portfolio [Member] | Weather Related Derivative [Member] | Other Liabilities [Member] | Not Designated as Hedging Instruments [Member]
Derivative Fair Values on Consolidated Balance Sheet [Line Items]
Liability Derivative Fair Value	$ 15,288us-gaap_DerivativeLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = axs_WeatherRelatedDerivativeMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_UnderwritingPortfolioMember	$ 815us-gaap_DerivativeLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = axs_WeatherRelatedDerivativeMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_UnderwritingPortfolioMember

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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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-Publisher FASB

-Name Accounting Standards Codification

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-Section 50

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+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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