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v2.4.1.9

REINSURANCE (DETAILS) (USD $) | 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
Premiums written: |  |  |  |  |  |  |  |  |  |  |
Gross |  |  |  |  |  |  |  |  | $ 4,711,519,000 us-gaap_PremiumsWrittenGross | $ 4,697,041,000 us-gaap_PremiumsWrittenGross | $ 4,139,643,000 us-gaap_PremiumsWrittenGross
Ceded |  |  |  |  |  |  |  |  | (804,544,000)us-gaap_CededPremiumsWritten | (768,841,000)us-gaap_CededPremiumsWritten | (802,187,000)us-gaap_CededPremiumsWritten
Net |  |  |  |  |  |  |  |  | 3,906,975,000 us-gaap_PremiumsWrittenNet | 3,928,200,000 us-gaap_PremiumsWrittenNet | 3,337,456,000 us-gaap_PremiumsWrittenNet
Premiums earned: |  |  |  |  |  |  |  |  |  |  |
Gross |  |  |  |  |  |  |  |  | 4,652,345,000 axs_PremiumsEarnedGross | 4,459,269,000 axs_PremiumsEarnedGross | 4,141,037,000 axs_PremiumsEarnedGross
Ceded |  |  |  |  |  |  |  |  | (781,346,000)us-gaap_CededPremiumsEarned | (752,204,000)us-gaap_CededPremiumsEarned | (725,574,000)us-gaap_CededPremiumsEarned
Net | 958,517,000 us-gaap_PremiumsEarnedNet | 966,138,000 us-gaap_PremiumsEarnedNet | 1,000,400,000 us-gaap_PremiumsEarnedNet | 945,949,000 us-gaap_PremiumsEarnedNet | 941,911,000 us-gaap_PremiumsEarnedNet | 945,242,000 us-gaap_PremiumsEarnedNet | 945,873,000 us-gaap_PremiumsEarnedNet | 874,039,000 us-gaap_PremiumsEarnedNet | 3,870,999,000 us-gaap_PremiumsEarnedNet | 3,707,065,000 us-gaap_PremiumsEarnedNet | 3,415,463,000 us-gaap_PremiumsEarnedNet
Reinsurance receivables: |  |  |  |  |  |  |  |  |  |  |
Ceded losses and loss expenses |  |  |  |  |  |  |  |  | 401,000,000 us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded | 415,000,000 us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded | 396,000,000 us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded
Provision for unrecoverable reinsurance | $ 18,000,000 us-gaap_ReinsuranceRecoverablesAllowance |  |  |  | $ 18,000,000 us-gaap_ReinsuranceRecoverablesAllowance |  |  |  | $ 18,000,000 us-gaap_ReinsuranceRecoverablesAllowance | $ 18,000,000 us-gaap_ReinsuranceRecoverablesAllowance |
AM Best A minus Or Better Rating [Member] | Gross Reinsurance Recoverable [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of gross reinsurance recoverables collectible from reinsurers rated A- or better by A.M. Best |  |  |  |  |  |  |  |  | 98.50%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = axs_GrossReinsuranceRecoverableMember / us-gaap_CreditRatingAMBestAxis = axs_AMBestAminusOrBetterRatingMember | 98.80%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = axs_GrossReinsuranceRecoverableMember / us-gaap_CreditRatingAMBestAxis = axs_AMBestAminusOrBetterRatingMember |

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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- Definition Amount of reduction of provision for policy benefits and costs incurred for policies ceded. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6480758&loc=d3e6811-158387 + Details
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