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SCHEDULE IV - SUPPLEMENTARY REINSURANCE INFORMATION (DETAILS) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Supplementary Insurance Information [Line Items]
Direct Gross Premium	$ 2,009,974us-gaap_DirectPremiumsWritten	$ 1,974,915us-gaap_DirectPremiumsWritten	$ 1,805,887us-gaap_DirectPremiumsWritten
Ceded To Other Companies	804,544us-gaap_CededPremiumsWritten	768,841us-gaap_CededPremiumsWritten	802,187us-gaap_CededPremiumsWritten
Assumed From Other Companies	2,701,545us-gaap_AssumedPremiumsWritten	2,722,126us-gaap_AssumedPremiumsWritten	2,333,756us-gaap_AssumedPremiumsWritten
Net Amount	3,906,975us-gaap_SupplementaryInsuranceInformationPremiumsWritten	3,928,200us-gaap_SupplementaryInsuranceInformationPremiumsWritten	3,337,456us-gaap_SupplementaryInsuranceInformationPremiumsWritten
Percentage of Amount Assumed to Net	69.10%axs_PremiumsPercentageAssumedToNetWritten	69.30%axs_PremiumsPercentageAssumedToNetWritten	69.90%axs_PremiumsPercentageAssumedToNetWritten
Property and Casualty [Member]
Supplementary Insurance Information [Line Items]
Direct Gross Premium	1,882,695us-gaap_DirectPremiumsWritten / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember	1,920,203us-gaap_DirectPremiumsWritten / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember	1,765,407us-gaap_DirectPremiumsWritten / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Ceded To Other Companies	786,555us-gaap_CededPremiumsWritten / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember	767,374us-gaap_CededPremiumsWritten / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember	800,466us-gaap_CededPremiumsWritten / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Assumed From Other Companies	2,548,174us-gaap_AssumedPremiumsWritten / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember	2,508,363us-gaap_AssumedPremiumsWritten / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember	2,213,441us-gaap_AssumedPremiumsWritten / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Net Amount	3,644,314us-gaap_SupplementaryInsuranceInformationPremiumsWritten / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember	3,661,192us-gaap_SupplementaryInsuranceInformationPremiumsWritten / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember	3,178,382us-gaap_SupplementaryInsuranceInformationPremiumsWritten / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Percentage of Amount Assumed to Net	69.90%axs_PremiumsPercentageAssumedToNetWritten / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember	68.50%axs_PremiumsPercentageAssumedToNetWritten / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember	69.60%axs_PremiumsPercentageAssumedToNetWritten / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Accident and Health [Member]
Supplementary Insurance Information [Line Items]
Direct Gross Premium	127,279us-gaap_DirectPremiumsWritten / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_AccidentAndHealthInsuranceSegmentMember	54,712us-gaap_DirectPremiumsWritten / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_AccidentAndHealthInsuranceSegmentMember	40,480us-gaap_DirectPremiumsWritten / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_AccidentAndHealthInsuranceSegmentMember
Ceded To Other Companies	17,989us-gaap_CededPremiumsWritten / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_AccidentAndHealthInsuranceSegmentMember	1,467us-gaap_CededPremiumsWritten / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_AccidentAndHealthInsuranceSegmentMember	1,721us-gaap_CededPremiumsWritten / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_AccidentAndHealthInsuranceSegmentMember
Assumed From Other Companies	153,371us-gaap_AssumedPremiumsWritten / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_AccidentAndHealthInsuranceSegmentMember	213,763us-gaap_AssumedPremiumsWritten / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_AccidentAndHealthInsuranceSegmentMember	120,315us-gaap_AssumedPremiumsWritten / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_AccidentAndHealthInsuranceSegmentMember
Net Amount	$ 262,661us-gaap_SupplementaryInsuranceInformationPremiumsWritten / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_AccidentAndHealthInsuranceSegmentMember	$ 267,008us-gaap_SupplementaryInsuranceInformationPremiumsWritten / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_AccidentAndHealthInsuranceSegmentMember	$ 159,074us-gaap_SupplementaryInsuranceInformationPremiumsWritten / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_AccidentAndHealthInsuranceSegmentMember
Percentage of Amount Assumed to Net	58.40%axs_PremiumsPercentageAssumedToNetWritten / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_AccidentAndHealthInsuranceSegmentMember	80.10%axs_PremiumsPercentageAssumedToNetWritten / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_AccidentAndHealthInsuranceSegmentMember	75.60%axs_PremiumsPercentageAssumedToNetWritten / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_AccidentAndHealthInsuranceSegmentMember

X

- Definition

Percentage of assumed premiums written by the entity to net premiums written.

+ References

No definition available.

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- Definition

Amount of written premiums assumed from other entities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 605

-Section 50

-Paragraph 1

-Subparagraph (b)(2),(c)(2)

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

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- Definition

Amount of written premiums ceded to other entities.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 17

-Article 12



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 605

-Section 50

-Paragraph 1

-Subparagraph (b),(c)(2)

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

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X

- Definition

Amount, before premiums ceded to other entities and premiums assumed by the entity, of premiums written.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 17

-Article 12



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 605

-Section 50

-Paragraph 1

-Subparagraph (b),(c)(1)

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

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X

- Definition

Amount of actual written premiums, including, as applicable, premiums from reinsurance assumed and net of premiums on reinsurance ceded.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 16

-Article 12



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 235

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-16)

-URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915

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