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DEBT AND FINANCING ARRANGEMENTS (Details) - Letter of Credit - USD ($) | Mar. 31, 2021 | Mar. 30, 2021
--- | --- | ---
Line of Credit Facility [Line Items] |  |
Line of credit facility | $ 750,000,000 |
LOC Facility |  |
Line of Credit Facility [Line Items] |  |
Line of credit facility, aggregate utilization capacity | 650,000,000 | $ 750,000,000
Line of credit facility, amount subject to administrative changes | 500,000,000 |
LOC Facility Two |  |
Line of Credit Facility [Line Items] |  |
Line of credit facility | 250,000,000 |
Line of credit facility, utilization capacity | $ 150,000,000 | $ 250,000,000

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- Definition Line Of Credit Facility, Aggregate Utilization Capacity + References No definition available. + Details
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Namespace Prefix: | axs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line Of Credit Facility, Amount Subject To Administrative Changes + References No definition available. + Details
Name: | axs_LineOfCreditFacilityAmountSubjectToAdministrativeChanges
Namespace Prefix: | axs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line Of Credit Facility, Utilization Capacity + References No definition available. + Details
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Namespace Prefix: | axs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |