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SEGMENT INFORMATION (DETAILS 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenue from External Customer [Line Items]
Net premiums earned	$ 958,517us-gaap_PremiumsEarnedNet	$ 966,138us-gaap_PremiumsEarnedNet	$ 1,000,400us-gaap_PremiumsEarnedNet	$ 945,949us-gaap_PremiumsEarnedNet	$ 941,911us-gaap_PremiumsEarnedNet	$ 945,242us-gaap_PremiumsEarnedNet	$ 945,873us-gaap_PremiumsEarnedNet	$ 874,039us-gaap_PremiumsEarnedNet	$ 3,870,999us-gaap_PremiumsEarnedNet	$ 3,707,065us-gaap_PremiumsEarnedNet	$ 3,415,463us-gaap_PremiumsEarnedNet
Insurance [Member]
Revenue from External Customer [Line Items]
Net premiums earned									1,830,544us-gaap_PremiumsEarnedNet / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember	1,722,762us-gaap_PremiumsEarnedNet / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember	1,558,058us-gaap_PremiumsEarnedNet / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember
Insurance [Member] | Property [Member]
Revenue from External Customer [Line Items]
Net premiums earned									444,197us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_PropertyMember / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember	462,364us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_PropertyMember / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember	408,943us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_PropertyMember / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember
Insurance [Member] | Marine [Member]
Revenue from External Customer [Line Items]
Net premiums earned									178,229us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_MarineMember / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember	179,057us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_MarineMember / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember	171,165us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_MarineMember / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember
Insurance [Member] | Terrorism [Member]
Revenue from External Customer [Line Items]
Net premiums earned									35,876us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_TerrorismMember / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember	39,298us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_TerrorismMember / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember	38,605us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_TerrorismMember / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember
Insurance [Member] | Aviation [Member]
Revenue from External Customer [Line Items]
Net premiums earned									41,192us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_AviationMember / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember	48,489us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_AviationMember / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember	60,363us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_AviationMember / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember
Insurance [Member] | Credit and political risk [Member]
Revenue from External Customer [Line Items]
Net premiums earned									63,095us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_CreditAndPoliticalRiskMember / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember	68,192us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_CreditAndPoliticalRiskMember / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember	87,103us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_CreditAndPoliticalRiskMember / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember
Insurance [Member] | Professional lines [Member]
Revenue from External Customer [Line Items]
Net premiums earned									629,365us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_ProfessionalLinesMember / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember	586,200us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_ProfessionalLinesMember / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember	563,500us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_ProfessionalLinesMember / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember
Insurance [Member] | Liability [Member]
Revenue from External Customer [Line Items]
Net premiums earned									146,819us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_LiabilityLineMember / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember	110,623us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_LiabilityLineMember / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember	86,873us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_LiabilityLineMember / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember
Insurance [Member] | Accident and health [Member]
Revenue from External Customer [Line Items]
Net premiums earned									291,771us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_AccidentAndHealthMember / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember	228,539us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_AccidentAndHealthMember / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember	141,506us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_AccidentAndHealthMember / us-gaap_StatementBusinessSegmentsAxis = axs_InsuranceMember
Reinsurance [Member]
Revenue from External Customer [Line Items]
Net premiums earned									2,040,455us-gaap_PremiumsEarnedNet / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember	1,984,303us-gaap_PremiumsEarnedNet / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember	1,857,405us-gaap_PremiumsEarnedNet / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember
Reinsurance [Member] | Catastrophe [Member]
Revenue from External Customer [Line Items]
Net premiums earned									325,307us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_CatastropheReinsuranceMember / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember	380,199us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_CatastropheReinsuranceMember / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember	375,088us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_CatastropheReinsuranceMember / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember
Reinsurance [Member] | Property [Member]
Revenue from External Customer [Line Items]
Net premiums earned									312,443us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_PropertyMember / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember	350,970us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_PropertyMember / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember	351,470us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_PropertyMember / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember
Reinsurance [Member] | Professional lines [Member]
Revenue from External Customer [Line Items]
Net premiums earned									336,058us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_ProfessionalLinesMember / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember	304,754us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_ProfessionalLinesMember / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember	297,726us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_ProfessionalLinesMember / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember
Reinsurance [Member] | Credit and surety [Member]
Revenue from External Customer [Line Items]
Net premiums earned									263,013us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_CreditAndBondMember / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember	279,943us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_CreditAndBondMember / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember	277,185us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_CreditAndBondMember / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember
Reinsurance [Member] | Motor [Member]
Revenue from External Customer [Line Items]
Net premiums earned									268,678us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_MotorMember / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember	221,844us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_MotorMember / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember	237,006us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_MotorMember / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember
Reinsurance [Member] | Liability [Member]
Revenue from External Customer [Line Items]
Net premiums earned									289,223us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_LiabilityLineMember / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember	234,736us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_LiabilityLineMember / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember	220,874us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_LiabilityLineMember / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember
Reinsurance [Member] | Agriculture [Member]
Revenue from External Customer [Line Items]
Net premiums earned									164,628us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_AgricultureLineMember / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember	126,490us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_AgricultureLineMember / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember	17,116us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_AgricultureLineMember / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember
Reinsurance [Member] | Engineering [Member]
Revenue from External Customer [Line Items]
Net premiums earned									61,143us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_EngineeringMember / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember	66,243us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_EngineeringMember / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember	68,402us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_EngineeringMember / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember
Reinsurance [Member] | Other [Member]
Revenue from External Customer [Line Items]
Net premiums earned									$ 19,962us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_OtherLinesOfBusinessMember / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember	$ 19,124us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_OtherLinesOfBusinessMember / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember	$ 12,538us-gaap_PremiumsEarnedNet / us-gaap_ProductOrServiceAxis = axs_OtherLinesOfBusinessMember / us-gaap_StatementBusinessSegmentsAxis = axs_ReinsuranceMember

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Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 17

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 235

-Section S99

-Paragraph 2

-Subparagraph (SX 210.12-17)

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-04.1)

-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 1

-Article 7



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 605

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547



Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.13(c))

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