<?xml version="1.0" encoding="utf-8"?>
<FilingSummary xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <Version>2.4.0.8</Version>
  <ProcessingTime />
  <ReportFormat>Html</ReportFormat>
  <ContextCount>596</ContextCount>
  <ElementCount>430</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>132</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>9</UnitCount>
  <MyReports>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0001000 - Document - Document And Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/DocumentAndEntityInformation</Role>
      <ShortName>Document And Entity Information</ShortName>
    </Report>
    <Report>
      <IsDefault>true</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>1001000 - Statement - Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/ConsolidatedBalanceSheets</Role>
      <ShortName>Consolidated Balance Sheets</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>1001501 - Statement - Consolidated Balance Sheets (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/ConsolidatedBalanceSheetsParenthetical</Role>
      <ShortName>Consolidated Balance Sheets (Parenthetical)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>1002000 - Statement - Consolidated Statements Of Operations And Comprehensive Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/ConsolidatedStatementsOfOperationsAndComprehensiveIncome</Role>
      <ShortName>Consolidated Statements Of Operations And Comprehensive Income</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>1002501 - Statement - Consolidated Statements Of Operations And Comprehensive Income (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/ConsolidatedStatementsOfOperationsAndComprehensiveIncomeParenthetical</Role>
      <ShortName>Consolidated Statements Of Operations And Comprehensive Income (Parenthetical)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>1003000 - Statement - Consolidated Statements Of Shareholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/ConsolidatedStatementsOfShareholdersEquity</Role>
      <ShortName>Consolidated Statements Of Shareholders' Equity</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>1004000 - Statement - Consolidated Statements Of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/ConsolidatedStatementsOfCashFlows</Role>
      <ShortName>Consolidated Statements Of Cash Flows</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>2101100 - Disclosure - General</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/General</Role>
      <ShortName>General</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>2102100 - Disclosure - Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/SignificantAccountingPolicies</Role>
      <ShortName>Significant Accounting Policies</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>2103100 - Disclosure - Investments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/Investments</Role>
      <ShortName>Investments</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>2104100 - Disclosure - Derivative Instruments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/DerivativeInstruments</Role>
      <ShortName>Derivative Instruments</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>2105100 - Disclosure - Fair Value Of Financial Instruments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/FairValueOfFinancialInstruments</Role>
      <ShortName>Fair Value Of Financial Instruments</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>2106100 - Disclosure - Reserve For Losses And Loss Expenses</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/ReserveForLossesAndLossExpenses</Role>
      <ShortName>Reserve For Losses And Loss Expenses</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>2107100 - Disclosure - Ceded Reinsurance</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/CededReinsurance</Role>
      <ShortName>Ceded Reinsurance</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>2108100 - Disclosure - Funds Held</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/FundsHeld</Role>
      <ShortName>Funds Held</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>2109100 - Disclosure - Debt and Financing Arrangements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/DebtAndFinancingArrangements</Role>
      <ShortName>Debt and Financing Arrangements</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>2110100 - Disclosure - Goodwill and Intangible Assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/GoodwillAndIntangibleAssets</Role>
      <ShortName>Goodwill and Intangible Assets</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>2111100 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/IncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>2112100 - Disclosure - Shareholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/ShareholdersEquity</Role>
      <ShortName>Shareholders' Equity</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>2113100 - Disclosure - Employee Benefit Plans</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/EmployeeBenefitPlans</Role>
      <ShortName>Employee Benefit Plans</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>2114100 - Disclosure - Earnings Per Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/EarningsPerShare</Role>
      <ShortName>Earnings Per Share</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>2115100 - Disclosure - Commitments And Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/CommitmentsAndContingencies</Role>
      <ShortName>Commitments And Contingencies</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>2116100 - Disclosure - Statutory Capital and Surplus</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/StatutoryCapitalAndSurplus</Role>
      <ShortName>Statutory Capital and Surplus</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>2117100 - Disclosure - Segment Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/SegmentInformation</Role>
      <ShortName>Segment Information</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>2118100 - Disclosure - Other Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/OtherIncome</Role>
      <ShortName>Other Income</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>2119100 - Disclosure - Condensed Consolidated Guarantor Financial Statements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/CondensedConsolidatedGuarantorFinancialStatements</Role>
      <ShortName>Condensed Consolidated Guarantor Financial Statements</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>2120100 - Disclosure - Unaudited Quarterly Financial Data</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/UnauditedQuarterlyFinancialData</Role>
      <ShortName>Unaudited Quarterly Financial Data</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>2121100 - Disclosure - Subsequent events</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/SubsequentEvents</Role>
      <ShortName>Subsequent events</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>2122100 - Disclosure - Schedule III - Supplementary Insurance Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/ScheduleIiiSupplementaryInsuranceInformation</Role>
      <ShortName>Schedule III - Supplementary Insurance Information</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>2123100 - Disclosure - Schedule IV - Supplementary Reinsurance Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/ScheduleIvSupplementaryReinsuranceInformation</Role>
      <ShortName>Schedule IV - Supplementary Reinsurance Information</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>2202201 - Disclosure - Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/SignificantAccountingPoliciesPolicies</Role>
      <ShortName>Significant Accounting Policies (Policies)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>2303301 - Disclosure - Investments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/InvestmentsTables</Role>
      <ShortName>Investments (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>2304301 - Disclosure - Derivative Instruments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/DerivativeInstrumentsTables</Role>
      <ShortName>Derivative Instruments (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>2305301 - Disclosure - Fair Value Of Financial Instruments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/FairValueOfFinancialInstrumentsTables</Role>
      <ShortName>Fair Value Of Financial Instruments (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>2306301 - Disclosure - Reserve For Losses And Loss Expenses (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/ReserveForLossesAndLossExpensesTables</Role>
      <ShortName>Reserve For Losses And Loss Expenses (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>2307301 - Disclosure - Ceded Reinsurance (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/CededReinsuranceTables</Role>
      <ShortName>Ceded Reinsurance (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>2309301 - Disclosure - Debt and Financing Arrangements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/DebtAndFinancingArrangementsTables</Role>
      <ShortName>Debt and Financing Arrangements (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>2310301 - Disclosure - Goodwill and Intangible Assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/GoodwillAndIntangibleAssetsTables</Role>
      <ShortName>Goodwill and Intangible Assets (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>2311301 - Disclosure - Income Taxes (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/IncomeTaxesTables</Role>
      <ShortName>Income Taxes (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>2312301 - Disclosure - Shareholders' Equity (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/ShareholdersEquityTables</Role>
      <ShortName>Shareholders' Equity (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>2313301 - Disclosure - Employee Benefit Plans (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/EmployeeBenefitPlansTables</Role>
      <ShortName>Employee Benefit Plans (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>2314301 - Disclosure - Earnings Per Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/EarningsPerShareTables</Role>
      <ShortName>Earnings Per Share (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>2315301 - Disclosure - Commitments and Contingencies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/CommitmentsAndContingenciesTables</Role>
      <ShortName>Commitments and Contingencies (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>2316301 - Disclosure - Statutory Capital and Surplus (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/StatutoryCapitalAndSurplusTables</Role>
      <ShortName>Statutory Capital and Surplus (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>2317301 - Disclosure - Segment Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/SegmentInformationTables</Role>
      <ShortName>Segment Information (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>2319301 - Disclosure - Condensed Consolidated Guarantor Financial Statements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/CondensedConsolidatedGuarantorFinancialStatementsTables</Role>
      <ShortName>Condensed Consolidated Guarantor Financial Statements (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>2320301 - Disclosure - Unaudited Quarterly Financial Data (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/UnauditedQuarterlyFinancialDataTables</Role>
      <ShortName>Unaudited Quarterly Financial Data (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>2403402 - Disclosure - Investments (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/InvestmentsNarrativeDetails</Role>
      <ShortName>Investments (Narrative) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>2403403 - Disclosure - Investments (Schedule Of Trading Securities) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/InvestmentsScheduleOfTradingSecuritiesDetails</Role>
      <ShortName>Investments (Schedule Of Trading Securities) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>2403404 - Disclosure - Investments (Schedule Of Other Investments) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/InvestmentsScheduleOfOtherInvestmentsDetails</Role>
      <ShortName>Investments (Schedule Of Other Investments) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>2403405 - Disclosure - Investments (Schedule Of Net Investment Income) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/InvestmentsScheduleOfNetInvestmentIncomeDetails</Role>
      <ShortName>Investments (Schedule Of Net Investment Income) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>2403406 - Disclosure - Investments (Components Of Realized Gains And Losses) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/InvestmentsComponentsOfRealizedGainsAndLossesDetails</Role>
      <ShortName>Investments (Components Of Realized Gains And Losses) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>2403407 - Disclosure - Investments (Pledged Assets) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/InvestmentsPledgedAssetsDetails</Role>
      <ShortName>Investments (Pledged Assets) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>2404402 - Disclosure - Derivative Instruments (Location and Amounts of Derivative Fair Values On The Condensed Consolidated Balance Sheets) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/DerivativeInstrumentsLocationAndAmountsOfDerivativeFairValuesOnCondensedConsolidatedBalanceSheetsDetails</Role>
      <ShortName>Derivative Instruments (Location and Amounts of Derivative Fair Values On The Condensed Consolidated Balance Sheets) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>2404403 - Disclosure - Derivative Instruments (Location and Amounts of Unrealized And Realized Gains (Losses) On Derivatives Recorded In The Condensed Consolidated Income Statements) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/DerivativeInstrumentsLocationAndAmountsOfUnrealizedAndRealizedGainsLossesOnDerivativesRecordedInCondensedConsolidatedIncomeStatementsDetails</Role>
      <ShortName>Derivative Instruments (Location and Amounts of Unrealized And Realized Gains (Losses) On Derivatives Recorded In The Condensed Consolidated Income Statements) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>2405402 - Disclosure - Fair Value Of Financial Instruments (Schedule Of Fair Value Of Financial Instruments) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/FairValueOfFinancialInstrumentsScheduleOfFairValueOfFinancialInstrumentsDetails</Role>
      <ShortName>Fair Value Of Financial Instruments (Schedule Of Fair Value Of Financial Instruments) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>2405403 - Disclosure - Fair Value Of Financial Instruments (Schedule Of Fair Value Measurement Using Significant Unobservable Inputs Level Three) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/FairValueOfFinancialInstrumentsScheduleOfFairValueMeasurementUsingSignificantUnobservableInputsLevelThreeDetails</Role>
      <ShortName>Fair Value Of Financial Instruments (Schedule Of Fair Value Measurement Using Significant Unobservable Inputs Level Three) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>2406402 - Disclosure - Reserve For Losses And Loss Expenses (Schedule Of Reserve For Losses And Loss Expenses) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/ReserveForLossesAndLossExpensesScheduleOfReserveForLossesAndLossExpensesDetails</Role>
      <ShortName>Reserve For Losses And Loss Expenses (Schedule Of Reserve For Losses And Loss Expenses) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>2406403 - Disclosure - Reserve For Losses And Loss Expenses (Schedule Of Reconciliation Of Unpaid Losses And Loss Expenses) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/ReserveForLossesAndLossExpensesScheduleOfReconciliationOfUnpaidLossesAndLossExpensesDetails</Role>
      <ShortName>Reserve For Losses And Loss Expenses (Schedule Of Reconciliation Of Unpaid Losses And Loss Expenses) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>2407402 - Disclosure - Ceded Reinsurance (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/CededReinsuranceNarrativeDetails</Role>
      <ShortName>Ceded Reinsurance (Narrative) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>2407403 - Disclosure - Ceded Reinsurance (Components of Reinsurance) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/CededReinsuranceComponentsOfReinsuranceDetails</Role>
      <ShortName>Ceded Reinsurance (Components of Reinsurance) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>2407404 - Disclosure - Ceded Reinsurance (Effects of Reinsurance) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/CededReinsuranceEffectsOfReinsuranceDetails</Role>
      <ShortName>Ceded Reinsurance (Effects of Reinsurance) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>2407405 - Disclosure - Ceded Reinsurance (Credit Risk by Reinsurer) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/CededReinsuranceCreditRiskByReinsurerDetails</Role>
      <ShortName>Ceded Reinsurance (Credit Risk by Reinsurer) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>2408401 - Disclosure - Funds Held (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/FundsHeldDetails</Role>
      <ShortName>Funds Held (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>2409402 - Disclosure - Debt and Financing Arrangements (Financing Structure) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/DebtAndFinancingArrangementsFinancingStructureDetails</Role>
      <ShortName>Debt and Financing Arrangements (Financing Structure) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>2409403 - Disclosure - Debt and Financing Arrangements (Debt Maturities) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/DebtAndFinancingArrangementsDebtMaturitiesDetails</Role>
      <ShortName>Debt and Financing Arrangements (Debt Maturities) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>2409404 - Disclosure - Debt and Financing Arrangements (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/DebtAndFinancingArrangementsNarrativeDetails</Role>
      <ShortName>Debt and Financing Arrangements (Narrative) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>2410402 - Disclosure - Goodwill and Intangible Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/GoodwillAndIntangibleAssetsDetails</Role>
      <ShortName>Goodwill and Intangible Assets (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>2410403 - Disclosure - Goodwill and Intangible Assets (Future amortization expense) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/GoodwillAndIntangibleAssetsFutureAmortizationExpenseDetails</Role>
      <ShortName>Goodwill and Intangible Assets (Future amortization expense) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>2411402 - Disclosure - Income Taxes (Components of Income Taxes) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/IncomeTaxesComponentsOfIncomeTaxesDetails</Role>
      <ShortName>Income Taxes (Components of Income Taxes) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>2411403 - Disclosure - Income Taxes (Sources of Income) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/IncomeTaxesSourcesOfIncomeDetails</Role>
      <ShortName>Income Taxes (Sources of Income) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>2411404 - Disclosure - Income Taxes (Deferred Tax Components) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/IncomeTaxesDeferredTaxComponentsDetails</Role>
      <ShortName>Income Taxes (Deferred Tax Components) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>2411405 - Disclosure - Income Taxes (Current Taxes) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/IncomeTaxesCurrentTaxesDetails</Role>
      <ShortName>Income Taxes (Current Taxes) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>2411406 - Disclosure - Income Taxes (Reconciliation of Effective Tax Rate) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/IncomeTaxesReconciliationOfEffectiveTaxRateDetails</Role>
      <ShortName>Income Taxes (Reconciliation of Effective Tax Rate) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>2412402 - Disclosure - Shareholders' Equity (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/ShareholdersEquityNarrativeDetails</Role>
      <ShortName>Shareholders' Equity (Narrative) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>2412403 - Disclosure - Shareholders' Equity (Issued Share Capital) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/ShareholdersEquityIssuedShareCapitalDetails</Role>
      <ShortName>Shareholders' Equity (Issued Share Capital) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>2412404 - Disclosure - Shareholders' Equity (Schedule Of Common Stock Outstanding Roll Forward) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/ShareholdersEquityScheduleOfCommonStockOutstandingRollForwardDetails</Role>
      <ShortName>Shareholders' Equity (Schedule Of Common Stock Outstanding Roll Forward) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>2412405 - Disclosure - Shareholders' Equity (Schedule Of Dividends Paid) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/ShareholdersEquityScheduleOfDividendsPaidDetails</Role>
      <ShortName>Shareholders' Equity (Schedule Of Dividends Paid) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>2412406 - Disclosure - Shareholders' Equity (Schedule Of Share Repurchases) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/ShareholdersEquityScheduleOfShareRepurchasesDetails</Role>
      <ShortName>Shareholders' Equity (Schedule Of Share Repurchases) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>2413402 - Disclosure - Employee Benefit Plans (Options Valuation Assumptions) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/EmployeeBenefitPlansOptionsValuationAssumptionsDetails</Role>
      <ShortName>Employee Benefit Plans (Options Valuation Assumptions) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>2413403 - Disclosure - Employee Benefit Plans (Options) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/EmployeeBenefitPlansOptionsDetails</Role>
      <ShortName>Employee Benefit Plans (Options) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>2413404 - Disclosure - Employee Benefit Plans (Restricted Stock Units) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/EmployeeBenefitPlansRestrictedStockUnitsDetails</Role>
      <ShortName>Employee Benefit Plans (Restricted Stock Units) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>2413405 - Disclosure - Employee Benefit Plans (Long Term Incentive Plan) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/EmployeeBenefitPlansLongTermIncentivePlanDetails</Role>
      <ShortName>Employee Benefit Plans (Long Term Incentive Plan) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R84.htm</HtmlFileName>
      <LongName>2413406 - Disclosure - Employee Benefit Plans (Cash-Equivalent Stock Awards) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/EmployeeBenefitPlansCashEquivalentStockAwardsDetails</Role>
      <ShortName>Employee Benefit Plans (Cash-Equivalent Stock Awards) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R85.htm</HtmlFileName>
      <LongName>2413407 - Disclosure - Employee Benefit Plans (Other Details) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/EmployeeBenefitPlansOtherDetailsDetails</Role>
      <ShortName>Employee Benefit Plans (Other Details) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R86.htm</HtmlFileName>
      <LongName>2414402 - Disclosure - Earnings Per Share (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/EarningsPerShareNarrativeDetails</Role>
      <ShortName>Earnings Per Share (Narrative) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R87.htm</HtmlFileName>
      <LongName>2414403 - Disclosure - Earnings Per Share (Comparison Of Basic And Diluted Earnings Per Share) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/EarningsPerShareComparisonOfBasicAndDilutedEarningsPerShareDetails</Role>
      <ShortName>Earnings Per Share (Comparison Of Basic And Diluted Earnings Per Share) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R88.htm</HtmlFileName>
      <LongName>2415402 - Disclosure - Commitments and Contingencies (Operating Leases) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/CommitmentsAndContingenciesOperatingLeasesDetails</Role>
      <ShortName>Commitments and Contingencies (Operating Leases) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R89.htm</HtmlFileName>
      <LongName>2415403 - Disclosure - Commitments and Contingencies (Credit Concentration Disclosure) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/CommitmentsAndContingenciesCreditConcentrationDisclosureDetails</Role>
      <ShortName>Commitments and Contingencies (Credit Concentration Disclosure) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R90.htm</HtmlFileName>
      <LongName>2416402 - Disclosure - Statutory Capital and Surplus (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/StatutoryCapitalAndSurplusDetails</Role>
      <ShortName>Statutory Capital and Surplus (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R91.htm</HtmlFileName>
      <LongName>2417402 - Disclosure - Segment Information (Summary Of Segment Results) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/SegmentInformationSummaryOfSegmentResultsDetails</Role>
      <ShortName>Segment Information (Summary Of Segment Results) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R92.htm</HtmlFileName>
      <LongName>2417403 - Disclosure - Segment Information (Gross Premiums Written By Geographic Location) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/SegmentInformationGrossPremiumsWrittenByGeographicLocationDetails</Role>
      <ShortName>Segment Information (Gross Premiums Written By Geographic Location) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R93.htm</HtmlFileName>
      <LongName>2418401 - Disclosure - Other Income (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/OtherIncomeDetails</Role>
      <ShortName>Other Income (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R94.htm</HtmlFileName>
      <LongName>2419402 - Disclosure - Condensed Consolidated Guarantor Financial Statements (Schedule Of Condensed Consolidating Balance Sheet) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/CondensedConsolidatedGuarantorFinancialStatementsScheduleOfCondensedConsolidatingBalanceSheetDetails</Role>
      <ShortName>Condensed Consolidated Guarantor Financial Statements (Schedule Of Condensed Consolidating Balance Sheet) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R95.htm</HtmlFileName>
      <LongName>2419403 - Disclosure - Condensed Consolidated Guarantor Financial Statements (Schedule Of Condensed Consolidating Income Statement) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/CondensedConsolidatedGuarantorFinancialStatementsScheduleOfCondensedConsolidatingIncomeStatementDetails</Role>
      <ShortName>Condensed Consolidated Guarantor Financial Statements (Schedule Of Condensed Consolidating Income Statement) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R96.htm</HtmlFileName>
      <LongName>2419404 - Disclosure - Condensed Consolidated Guarantor Financial Statements (Schedule Of Condensed Consolidating Cash Flows) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/CondensedConsolidatedGuarantorFinancialStatementsScheduleOfCondensedConsolidatingCashFlowsDetails</Role>
      <ShortName>Condensed Consolidated Guarantor Financial Statements (Schedule Of Condensed Consolidating Cash Flows) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R97.htm</HtmlFileName>
      <LongName>2419405 - Disclosure - Condensed Consolidated Guarantor Financial Statements (Notes to Consolidated Guarantor Financial Statements) (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.awac.com/role/CondensedConsolidatedGuarantorFinancialStatementsNotesToConsolidatedGuarantorFinancialStatementsDetails</Role>
      <ShortName>Condensed Consolidated Guarantor Financial Statements (Notes to Consolidated Guarantor Financial Statements) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R98.htm</HtmlFileName>
      <LongName>2420402 - Disclosure - Unaudited Quarterly Financial Data (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/UnauditedQuarterlyFinancialDataDetails</Role>
      <ShortName>Unaudited Quarterly Financial Data (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R99.htm</HtmlFileName>
      <LongName>2421401 - Disclosure - Subsequent Events (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/SubsequentEventsDetails</Role>
      <ShortName>Subsequent Events (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R100.htm</HtmlFileName>
      <LongName>2422401 - Disclosure - Schedule III - Supplementary Insurance Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/ScheduleIiiSupplementaryInsuranceInformationDetails</Role>
      <ShortName>Schedule III - Supplementary Insurance Information (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R101.htm</HtmlFileName>
      <LongName>2423401 - Disclosure - Schedule IV - Supplementary Reinsurance Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.awac.com/role/ScheduleIvSupplementaryReinsuranceInformationDetails</Role>
      <ShortName>Schedule IV - Supplementary Reinsurance Information (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <Logs>
    <Log type="Info">Element us-gaap_CommonStockDividendsPerShareDeclared had a mix of decimals attribute values: 0 2.</Log>
    <Log type="Info">Process Flow-Through: 1001000 - Statement - Consolidated Balance Sheets</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Dec. 31, 2011'</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Dec. 31, 2010'</Log>
    <Log type="Info">Process Flow-Through: 1001501 - Statement - Consolidated Balance Sheets (Parenthetical)</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Dec. 31, 2013
CHF'</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Dec. 31, 2012
CHF'</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Dec. 31, 2011'</Log>
    <Log type="Info">Process Flow-Through: 1002000 - Statement - Consolidated Statements Of Operations And Comprehensive Income</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Dec. 31, 2013'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Sep. 30, 2013'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Jun. 30, 2013'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Mar. 31, 2013'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Dec. 31, 2012'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Sep. 30, 2012'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Jun. 30, 2012'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Mar. 31, 2012'</Log>
    <Log type="Info">Process Flow-Through: 1002501 - Statement - Consolidated Statements Of Operations And Comprehensive Income (Parenthetical)</Log>
    <Log type="Info">Process Flow-Through: 1004000 - Statement - Consolidated Statements Of Cash Flows</Log>
  </Logs>
  <InputFiles>
    <File>awh-20131231.xml</File>
    <File>awh-20131231.xsd</File>
    <File>awh-20131231_cal.xml</File>
    <File>awh-20131231_def.xml</File>
    <File>awh-20131231_lab.xml</File>
    <File>awh-20131231_pre.xml</File>
  </InputFiles>
  <SupplementalFiles />
  <BaseTaxonomies />
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
