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

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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 + Details
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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 + Details
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- 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 + Details
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- 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 + Details
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