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DEBT AND FINANCING ARRANGEMENTS - Credit facilities (Details) - Letter of Credit Facility - Citibank - USD ($)	Dec. 31, 2020	Mar. 28, 2020	Dec. 31, 2019	Dec. 24, 2019	Mar. 27, 2017	Mar. 31, 2015	Mar. 30, 2015	Nov. 20, 2013
Line of Credit Facility [Line Items]
Maximum capacity					$ 500,000,000	$ 500,000,000	$ 750,000,000	$ 750,000,000
Letters of credit outstanding	$ 339,000,000		$ 357,000,000
$500 million secured LOC
Line of Credit Facility [Line Items]
Maximum capacity		$ 250,000,000		$ 500,000,000	500,000,000
$250 million secured LOC
Line of Credit Facility [Line Items]
Maximum capacity					$ 250,000,000

X

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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_LineOfCreditFacilityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=axs_CitibankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=axs_LOCFacilityTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=axs_LOCFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: