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SHAREHOLDERS' EQUITY (DETAILS 2) (Common Stock [Member], USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 05, 2014
Treasury Shares [Line Items] |  |  |  |
Value of share repurchase authorized by the Board of Directors during the period |  |  |  | $ 750,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1
Total shares | 11,752,000 us-gaap_TreasuryStockSharesAcquired | 10,830,000 us-gaap_TreasuryStockSharesAcquired | 9,376,000 us-gaap_TreasuryStockSharesAcquired |
Total cost | 543,202,000 us-gaap_TreasuryStockValueAcquiredCostMethod | 472,263,000 us-gaap_TreasuryStockValueAcquiredCostMethod | 317,687,000 us-gaap_TreasuryStockValueAcquiredCostMethod |
Average price per share | $ 46.22 us-gaap_TreasuryStockAcquiredAverageCostPerShare | $ 43.61 us-gaap_TreasuryStockAcquiredAverageCostPerShare | $ 33.88 us-gaap_TreasuryStockAcquiredAverageCostPerShare |
In the open market [Member] |  |  |  |
Treasury Shares [Line Items] |  |  |  |
Total shares | 11,317,000 us-gaap_TreasuryStockSharesAcquired / axs_ShareRepurchaseTypeAxis = axs_OpenMarketMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 7,362,000 us-gaap_TreasuryStockSharesAcquired / axs_ShareRepurchaseTypeAxis = axs_OpenMarketMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 6,057,000 us-gaap_TreasuryStockSharesAcquired / axs_ShareRepurchaseTypeAxis = axs_OpenMarketMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
Total cost | 524,168,000 us-gaap_TreasuryStockValueAcquiredCostMethod / axs_ShareRepurchaseTypeAxis = axs_OpenMarketMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 337,083,000 us-gaap_TreasuryStockValueAcquiredCostMethod / axs_ShareRepurchaseTypeAxis = axs_OpenMarketMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 203,704,000 us-gaap_TreasuryStockValueAcquiredCostMethod / axs_ShareRepurchaseTypeAxis = axs_OpenMarketMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
Average price per share | $ 46.32 us-gaap_TreasuryStockAcquiredAverageCostPerShare / axs_ShareRepurchaseTypeAxis = axs_OpenMarketMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | $ 45.79 us-gaap_TreasuryStockAcquiredAverageCostPerShare / axs_ShareRepurchaseTypeAxis = axs_OpenMarketMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | $ 33.63 us-gaap_TreasuryStockAcquiredAverageCostPerShare / axs_ShareRepurchaseTypeAxis = axs_OpenMarketMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
From employees [Member] |  |  |  |
Treasury Shares [Line Items] |  |  |  |
Total shares | 435,000 us-gaap_TreasuryStockSharesAcquired / axs_ShareRepurchaseTypeAxis = axs_EmployeesMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 468,000 us-gaap_TreasuryStockSharesAcquired / axs_ShareRepurchaseTypeAxis = axs_EmployeesMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 319,000 us-gaap_TreasuryStockSharesAcquired / axs_ShareRepurchaseTypeAxis = axs_EmployeesMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
Total cost | 19,034,000 us-gaap_TreasuryStockValueAcquiredCostMethod / axs_ShareRepurchaseTypeAxis = axs_EmployeesMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 19,080,000 us-gaap_TreasuryStockValueAcquiredCostMethod / axs_ShareRepurchaseTypeAxis = axs_EmployeesMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 10,483,000 us-gaap_TreasuryStockValueAcquiredCostMethod / axs_ShareRepurchaseTypeAxis = axs_EmployeesMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
Average price per share | $ 43.82 us-gaap_TreasuryStockAcquiredAverageCostPerShare / axs_ShareRepurchaseTypeAxis = axs_EmployeesMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | $ 40.75 us-gaap_TreasuryStockAcquiredAverageCostPerShare / axs_ShareRepurchaseTypeAxis = axs_EmployeesMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | $ 32.85 us-gaap_TreasuryStockAcquiredAverageCostPerShare / axs_ShareRepurchaseTypeAxis = axs_EmployeesMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
From founding shareholder [Member] |  |  |  |
Treasury Shares [Line Items] |  |  |  |
Total shares | 0 us-gaap_TreasuryStockSharesAcquired / axs_ShareRepurchaseTypeAxis = axs_FoundingShareholderMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 3,000,000 us-gaap_TreasuryStockSharesAcquired / axs_ShareRepurchaseTypeAxis = axs_FoundingShareholderMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 3,000,000 us-gaap_TreasuryStockSharesAcquired / axs_ShareRepurchaseTypeAxis = axs_FoundingShareholderMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
Total cost | $ 0 us-gaap_TreasuryStockValueAcquiredCostMethod / axs_ShareRepurchaseTypeAxis = axs_FoundingShareholderMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | $ 116,100,000 us-gaap_TreasuryStockValueAcquiredCostMethod / axs_ShareRepurchaseTypeAxis = axs_FoundingShareholderMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | $ 103,500,000 us-gaap_TreasuryStockValueAcquiredCostMethod / axs_ShareRepurchaseTypeAxis = axs_FoundingShareholderMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
Average price per share | $ 0.00 us-gaap_TreasuryStockAcquiredAverageCostPerShare / axs_ShareRepurchaseTypeAxis = axs_FoundingShareholderMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | $ 38.70 us-gaap_TreasuryStockAcquiredAverageCostPerShare / axs_ShareRepurchaseTypeAxis = axs_FoundingShareholderMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | $ 34.50 us-gaap_TreasuryStockAcquiredAverageCostPerShare / axs_ShareRepurchaseTypeAxis = axs_FoundingShareholderMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
From founding shareholder [Member] | Trident [Member] |  |  |  |
Treasury Shares [Line Items] |  |  |  |
Total shares |  | 3,000,000 us-gaap_TreasuryStockSharesAcquired / axs_FoundingShareholderAxis = axs_TridentMember / axs_ShareRepurchaseTypeAxis = axs_FoundingShareholderMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 3,000,000 us-gaap_TreasuryStockSharesAcquired / axs_FoundingShareholderAxis = axs_TridentMember / axs_ShareRepurchaseTypeAxis = axs_FoundingShareholderMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |

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