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SHAREHOLDERS' EQUITY (DETAILS) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Class of Stock [Line Items]
Authorized share capital, common	800,000,000us-gaap_CommonStockSharesAuthorized	800,000,000us-gaap_CommonStockSharesAuthorized
Par value per share, common	$ 0.0125us-gaap_CommonStockParOrStatedValuePerShare	$ 0.0125us-gaap_CommonStockParOrStatedValuePerShare
Shares issued, balance at beginning of period	174,134,000us-gaap_CommonStockSharesIssued
Total shares issued at end of period	175,478,000us-gaap_CommonStockSharesIssued	174,134,000us-gaap_CommonStockSharesIssued
Treasury shares, balance at beginning of period	(64,649,000)us-gaap_TreasuryStockShares
Total treasury shares at end of period	(76,052,000)us-gaap_TreasuryStockShares	(64,649,000)us-gaap_TreasuryStockShares
Total shares outstanding	99,426,000us-gaap_CommonStockSharesOutstanding	109,485,000us-gaap_CommonStockSharesOutstanding
Cash dividends declared per common share	$ 1.10us-gaap_CommonStockDividendsPerShareDeclared	$ 1.02us-gaap_CommonStockDividendsPerShareDeclared	$ 0.97us-gaap_CommonStockDividendsPerShareDeclared
Common Stock [Member]
Class of Stock [Line Items]
Shares issued, balance at beginning of period	174,134,000us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember	171,867,000us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember	170,159,000us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Shares issued	1,344,000us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember	2,267,000us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember	1,708,000us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Total shares issued at end of period	175,478,000us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember	174,134,000us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember	171,867,000us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Treasury shares, balance at beginning of period	(64,649,000)us-gaap_TreasuryStockShares / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember	(53,947,000)us-gaap_TreasuryStockShares / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember	(44,571,000)us-gaap_TreasuryStockShares / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Shares repurchased	(11,752,000)us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember	(10,830,000)us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember	(9,376,000)us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Shares reissued from treasury	349,000axs_StockIssuedDuringPeriodSharesTreasuryStockReissuedIncludingToSatisfyEquityBasedCompensationObligations / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember	128,000axs_StockIssuedDuringPeriodSharesTreasuryStockReissuedIncludingToSatisfyEquityBasedCompensationObligations / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember	0axs_StockIssuedDuringPeriodSharesTreasuryStockReissuedIncludingToSatisfyEquityBasedCompensationObligations / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Total treasury shares at end of period	(76,052,000)us-gaap_TreasuryStockShares / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember	(64,649,000)us-gaap_TreasuryStockShares / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember	(53,947,000)us-gaap_TreasuryStockShares / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Total shares outstanding	99,426,000us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember	109,485,000us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember	117,920,000us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember

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- Definition

Number of treasury shares (units) reissued during the period. Upon reissuance of shares (units) from treasury, either the common or preferred stock (unit) reissued is outstanding.

+ References

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Aggregate dividends declared during the period for each share of common stock outstanding.

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Face amount or stated value per share of common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Number of new stock issued during the period.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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