XML 111 R89.htm IDEA: XBRL DOCUMENT
v3.6.0.2

COMMITMENTS AND CONTINGENCIES (DETAILS 2) - broker | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Reinsurance Recoverable On Unpaid And Paid Losses [Member] | Reinsurer Concentration [Member] | Reinsurer 1 [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage of total | 13.00% | 11.00% |
Reinsurance Recoverable On Unpaid And Paid Losses [Member] | Reinsurer Concentration [Member] | Reinsurer 2 [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage of total | 10.00% | 11.00% |
Reinsurance Recoverable On Unpaid And Paid Losses [Member] | Reinsurer Concentration [Member] | Reinsurer 3 [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage of total | 9.00% | 11.00% |
Reinsurance Recoverable On Unpaid And Paid Losses [Member] | Reinsurer Concentration [Member] | Top Ten Reinsurers [Member] | AM Best, A+ Rating [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage of total | 67.00% | 72.00% |
Gross Premiums Written [Member] | Customer Concentration [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage of total | 52.00% | 53.00% | 56.00%
Concentration risk, number of brokers exceeding threshold | 3 |  |
Gross Premiums Written [Member] | Customer Concentration [Member] | Marsh & McLennan Companies Inc. [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage of total | 21.00% | 22.00% | 22.00%
Gross Premiums Written [Member] | Customer Concentration [Member] | Aon plc [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage of total | 19.00% | 18.00% | 22.00%
Gross Premiums Written [Member] | Customer Concentration [Member] | Willis Towers Watson PLC [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage of total | 12.00% | 13.00% | 12.00%

X
- Definition Number of customers where transactions amount to 10 percent or more of the entity's revenues. + References No definition available. + Details
Name: | axs_SegmentReportingDisclosureOfMajorCustomersNumberOfMajorCustomers
Namespace Prefix: | axs_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ConcentrationRiskLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592 Reference 2: 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=73719730&loc=d3e13531-108611 Reference 3: 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=64851502&loc=d3e6404-108592 Reference 4: 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=73719730&loc=d3e13537-108611 + Details
Name: | us-gaap_ConcentrationRiskPercentage1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_ReinsuranceRecoverableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByTypeAxis=us-gaap_ReinsurerConcentrationRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CededCreditRiskAxis=axs_ReinsurerOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CededCreditRiskAxis=axs_ReinsurerTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CededCreditRiskAxis=axs_ReinsurerThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CededCreditRiskAxis=axs_TenLargestReinsurersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditRatingAMBestAxis=us-gaap_AMBestAPlusRatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByBenchmarkAxis=axs_PremiumsWrittenGrossMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByTypeAxis=us-gaap_CustomerConcentrationRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorCustomersAxis=axs_MarshMcLennanCompaniesIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorCustomersAxis=axs_AonplcMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorCustomersAxis=axs_WillisTowerWatsonPLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |