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SHAREHOLDERS' EQUITY (DETAILS 2) (Common Stock [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Treasury Shares [Line Items]
Total shares	290us-gaap_TreasuryStockSharesAcquired	4,036us-gaap_TreasuryStockSharesAcquired
Total cost	$ 14,771us-gaap_TreasuryStockValueAcquiredCostMethod	$ 178,703us-gaap_TreasuryStockValueAcquiredCostMethod
Average price per share	$ 50.95us-gaap_TreasuryStockAcquiredAverageCostPerShare	$ 44.27us-gaap_TreasuryStockAcquiredAverageCostPerShare
In the Open Market [Member]
Treasury Shares [Line Items]
Total shares	16us-gaap_TreasuryStockSharesAcquired / axs_ShareRepurchaseTypeAxis = axs_OpenMarketMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember	3,710us-gaap_TreasuryStockSharesAcquired / axs_ShareRepurchaseTypeAxis = axs_OpenMarketMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Total cost	832us-gaap_TreasuryStockValueAcquiredCostMethod / axs_ShareRepurchaseTypeAxis = axs_OpenMarketMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember	164,606us-gaap_TreasuryStockValueAcquiredCostMethod / axs_ShareRepurchaseTypeAxis = axs_OpenMarketMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Average price per share	$ 50.69us-gaap_TreasuryStockAcquiredAverageCostPerShare / axs_ShareRepurchaseTypeAxis = axs_OpenMarketMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember	$ 44.37us-gaap_TreasuryStockAcquiredAverageCostPerShare / axs_ShareRepurchaseTypeAxis = axs_OpenMarketMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
From Employees [Member]
Treasury Shares [Line Items]
Total shares	274us-gaap_TreasuryStockSharesAcquired / axs_ShareRepurchaseTypeAxis = axs_EmployeesMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember	326us-gaap_TreasuryStockSharesAcquired / axs_ShareRepurchaseTypeAxis = axs_EmployeesMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Total cost	$ 13,939us-gaap_TreasuryStockValueAcquiredCostMethod / axs_ShareRepurchaseTypeAxis = axs_EmployeesMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember	$ 14,097us-gaap_TreasuryStockValueAcquiredCostMethod / axs_ShareRepurchaseTypeAxis = axs_EmployeesMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Average price per share	$ 50.97us-gaap_TreasuryStockAcquiredAverageCostPerShare / axs_ShareRepurchaseTypeAxis = axs_EmployeesMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember	$ 43.14us-gaap_TreasuryStockAcquiredAverageCostPerShare / axs_ShareRepurchaseTypeAxis = axs_EmployeesMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember

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- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

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- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

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- Definition

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

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