<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>1296</ContextCount>
  <ElementCount>659</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>245</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>18</UnitCount>
  <MyReports>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0000001 - Document - Cover Page</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/CoverPage</Role>
      <ShortName>Cover Page</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>0000002 - Document - Audit Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/AuditInformation</Role>
      <ShortName>Audit Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>9952151 - Statement - CONSOLIDATED BALANCE SHEETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/CONSOLIDATEDBALANCESHEETS</Role>
      <ShortName>CONSOLIDATED BALANCE SHEETS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>9952152 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/CONSOLIDATEDBALANCESHEETSParenthetical</Role>
      <ShortName>CONSOLIDATED BALANCE SHEETS (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>9952153 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS AND OTHER COMPREHENSIVE INCOME</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/CONSOLIDATEDSTATEMENTSOFOPERATIONSANDOTHERCOMPREHENSIVEINCOME</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF OPERATIONS AND OTHER COMPREHENSIVE INCOME</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>9952154 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS AND OTHER COMPREHENSIVE INCOME (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/CONSOLIDATEDSTATEMENTSOFOPERATIONSANDOTHERCOMPREHENSIVEINCOMEParenthetical</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF OPERATIONS AND OTHER COMPREHENSIVE INCOME (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>9952155 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/CONSOLIDATEDSTATEMENTSOFCHANGESINSHAREHOLDERSEQUITY</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>9952156 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/CONSOLIDATEDSTATEMENTSOFCHANGESINSHAREHOLDERSEQUITYParenthetical</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>9952157 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF CASH FLOWS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>9952158 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS (Parentheticals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWSParentheticals</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF CASH FLOWS (Parentheticals)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>9952159 - Disclosure - History, Organization and Business Combination</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/HistoryOrganizationandBusinessCombination</Role>
      <ShortName>History, Organization and Business Combination</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>9952160 - Disclosure - Basis of Preparation and Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/BasisofPreparationandSignificantAccountingPolicies</Role>
      <ShortName>Basis of Preparation and Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>9952161 - Disclosure - Segment Reporting</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/SegmentReporting</Role>
      <ShortName>Segment Reporting</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>9952162 - Disclosure - Investments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/Investments</Role>
      <ShortName>Investments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>9952163 - Disclosure - Variable Interest Entities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/VariableInterestEntities</Role>
      <ShortName>Variable Interest Entities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>9952164 - Disclosure - Fair Value Measurements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/FairValueMeasurements</Role>
      <ShortName>Fair Value Measurements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>9952165 - Disclosure - Reinsurance</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/Reinsurance</Role>
      <ShortName>Reinsurance</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>9952166 - Disclosure - Derivative Contracts</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/DerivativeContracts</Role>
      <ShortName>Derivative Contracts</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>9952167 - Disclosure - Deferred Policy Acquisition Costs</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/DeferredPolicyAcquisitionCosts</Role>
      <ShortName>Deferred Policy Acquisition Costs</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>9952168 - Disclosure - Reserves for Losses and Adjustment Expenses</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/ReservesforLossesandAdjustmentExpenses</Role>
      <ShortName>Reserves for Losses and Adjustment Expenses</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>9952169 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/IncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>9952170 - Disclosure - Capital Structure</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/CapitalStructure</Role>
      <ShortName>Capital Structure</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>9952171 - Disclosure - Earnings Per Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/EarningsPerShare</Role>
      <ShortName>Earnings Per Share</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>9952172 - Disclosure - Statutory Requirements and Dividends Restrictions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/StatutoryRequirementsandDividendsRestrictions</Role>
      <ShortName>Statutory Requirements and Dividends Restrictions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>9952173 - Disclosure - Dividends</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/Dividends</Role>
      <ShortName>Dividends</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>9952174 - Disclosure - Retirement Plans</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/RetirementPlans</Role>
      <ShortName>Retirement Plans</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>9952175 - Disclosure - Share-Based Payments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/ShareBasedPayments</Role>
      <ShortName>Share-Based Payments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>9952176 - Disclosure - Intangible Assets and Goodwill</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/IntangibleAssetsandGoodwill</Role>
      <ShortName>Intangible Assets and Goodwill</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>28</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>9952177 - Disclosure - Operating Leases (Notes)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.aspen.co/role/OperatingLeasesNotes</Role>
      <ShortName>Operating Leases (Notes)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>29</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>9952178 - Disclosure - Related Party Transactions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/RelatedPartyTransactions</Role>
      <ShortName>Related Party Transactions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>9952179 - Disclosure - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/CommitmentsandContingencies</Role>
      <ShortName>Commitments and Contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>9952180 - Disclosure - Concentration of Credit Risk</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/ConcentrationofCreditRisk</Role>
      <ShortName>Concentration of Credit Risk</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>32</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>9952181 - Disclosure - Reclassifications from Accumulated Other Comprehensive Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/ReclassificationsfromAccumulatedOtherComprehensiveIncome</Role>
      <ShortName>Reclassifications from Accumulated Other Comprehensive Income</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>9952182 - Disclosure - Credit Facilities and Long-term Debt</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/CreditFacilitiesandLongtermDebt</Role>
      <ShortName>Credit Facilities and Long-term Debt</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>34</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>9952183 - Disclosure - Credit Losses</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/CreditLosses</Role>
      <ShortName>Credit Losses</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>35</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>9952184 - Disclosure - Subsequent Events</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/SubsequentEvents</Role>
      <ShortName>Subsequent Events</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>36</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>9952185 - Disclosure - Schedule I - Investments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/ScheduleIInvestments</Role>
      <ShortName>Schedule I - Investments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>9952186 - Disclosure - Schedule II - Condensed Financial Information of Registrant</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/ScheduleIICondensedFinancialInformationofRegistrant</Role>
      <ShortName>Schedule II - Condensed Financial Information of Registrant</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>9952187 - Disclosure - Schedule III - Supplementary Insurance Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/ScheduleIIISupplementaryInsuranceInformation</Role>
      <ShortName>Schedule III - Supplementary Insurance Information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>9952188 - Disclosure - Schedule IV - Reinsurance</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/ScheduleIVReinsurance</Role>
      <ShortName>Schedule IV - Reinsurance</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>9952189 - Disclosure - Schedule V - Valuation and Qualifying Accounts</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/ScheduleVValuationandQualifyingAccounts</Role>
      <ShortName>Schedule V - Valuation and Qualifying Accounts</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>995447 - Disclosure - Insider Trading Policies and Procedures</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/InsiderTradingPoliciesProc</Role>
      <ShortName>Insider Trading Policies and Procedures</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>995550 - Disclosure - Cybersecurity Risk Management and Strategy Disclosure</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/cyd/role/CybersecurityRiskManagementAndStrategyDisclosure</Role>
      <ShortName>Cybersecurity Risk Management and Strategy Disclosure</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>9955511 - Disclosure - Basis of Preparation and Significant Accounting Policies Basis of Preparation and Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/BasisofPreparationandSignificantAccountingPoliciesBasisofPreparationandSignificantAccountingPoliciesPolicies</Role>
      <ShortName>Basis of Preparation and Significant Accounting Policies Basis of Preparation and Significant Accounting Policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://www.aspen.co/role/BasisofPreparationandSignificantAccountingPolicies</ParentRole>
      <Position>44</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>9955512 - Disclosure - Segment Reporting (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/SegmentReportingTables</Role>
      <ShortName>Segment Reporting (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.aspen.co/role/SegmentReporting</ParentRole>
      <Position>45</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>9955513 - Disclosure - Investments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/InvestmentsTables</Role>
      <ShortName>Investments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.aspen.co/role/Investments</ParentRole>
      <Position>46</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>9955514 - Disclosure - Fair Value Measurements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/FairValueMeasurementsTables</Role>
      <ShortName>Fair Value Measurements (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.aspen.co/role/FairValueMeasurements</ParentRole>
      <Position>47</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>9955515 - Disclosure - Reinsurance (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/ReinsuranceTables</Role>
      <ShortName>Reinsurance (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.aspen.co/role/Reinsurance</ParentRole>
      <Position>48</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>9955516 - Disclosure - Derivative Contracts (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/DerivativeContractsTables</Role>
      <ShortName>Derivative Contracts (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.aspen.co/role/DerivativeContracts</ParentRole>
      <Position>49</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>9955517 - Disclosure - Deferred Policy Acquisition Costs (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/DeferredPolicyAcquisitionCostsTables</Role>
      <ShortName>Deferred Policy Acquisition Costs (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.aspen.co/role/DeferredPolicyAcquisitionCosts</ParentRole>
      <Position>50</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>9955518 - Disclosure - Reserves for Losses and Adjustment Expenses (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/ReservesforLossesandAdjustmentExpensesTables</Role>
      <ShortName>Reserves for Losses and Adjustment Expenses (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.aspen.co/role/ReservesforLossesandAdjustmentExpenses</ParentRole>
      <Position>51</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>9955519 - Disclosure - Income Taxes (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/IncomeTaxesTables</Role>
      <ShortName>Income Taxes (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.aspen.co/role/IncomeTaxes</ParentRole>
      <Position>52</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>9955520 - Disclosure - Capital Structure (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/CapitalStructureTables</Role>
      <ShortName>Capital Structure (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.aspen.co/role/CapitalStructure</ParentRole>
      <Position>53</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>9955521 - Disclosure - Earnings Per Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/EarningsPerShareTables</Role>
      <ShortName>Earnings Per Share (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.aspen.co/role/EarningsPerShare</ParentRole>
      <Position>54</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>9955522 - Disclosure - Statutory Requirements and Dividends Restrictions (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/StatutoryRequirementsandDividendsRestrictionsTables</Role>
      <ShortName>Statutory Requirements and Dividends Restrictions (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.aspen.co/role/StatutoryRequirementsandDividendsRestrictions</ParentRole>
      <Position>55</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>9955523 - Disclosure - Dividends (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/DividendsTables</Role>
      <ShortName>Dividends (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.aspen.co/role/Dividends</ParentRole>
      <Position>56</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>9955524 - Disclosure - Share-Based Payments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/ShareBasedPaymentsTables</Role>
      <ShortName>Share-Based Payments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.aspen.co/role/ShareBasedPayments</ParentRole>
      <Position>57</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>9955525 - Disclosure - Operating Leases (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/OperatingLeasesTables</Role>
      <ShortName>Operating Leases (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.aspen.co/role/OperatingLeasesNotes</ParentRole>
      <Position>58</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>9955526 - Disclosure - Related Party Disclosures (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/RelatedPartyDisclosuresTables</Role>
      <ShortName>Related Party Disclosures (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>9955527 - Disclosure - Commitments and Contingencies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/CommitmentsandContingenciesTables</Role>
      <ShortName>Commitments and Contingencies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.aspen.co/role/CommitmentsandContingencies</ParentRole>
      <Position>60</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>9955529 - Disclosure - Reclassifications from Accumulated Other Comprehensive Income (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/ReclassificationsfromAccumulatedOtherComprehensiveIncomeTables</Role>
      <ShortName>Reclassifications from Accumulated Other Comprehensive Income (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.aspen.co/role/ReclassificationsfromAccumulatedOtherComprehensiveIncome</ParentRole>
      <Position>61</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>9955530 - Disclosure - Credit Facility and Long-term Debt (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/CreditFacilityandLongtermDebtTables</Role>
      <ShortName>Credit Facility and Long-term Debt (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>9955531 - Disclosure - Credit Losses (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/CreditLossesTables</Role>
      <ShortName>Credit Losses (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.aspen.co/role/CreditLosses</ParentRole>
      <Position>63</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>9955532 - Disclosure - Subsequent Events (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/SubsequentEventsTables</Role>
      <ShortName>Subsequent Events (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.aspen.co/role/SubsequentEvents</ParentRole>
      <Position>64</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>9955533 - Disclosure - History, Organization and Business Combination Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/HistoryOrganizationandBusinessCombinationNarrativeDetails</Role>
      <ShortName>History, Organization and Business Combination Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.aspen.co/role/HistoryOrganizationandBusinessCombination</ParentRole>
      <Position>65</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>9955534 - Disclosure - Basis of Preparation and Significant Accounting Policies - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/BasisofPreparationandSignificantAccountingPoliciesAdditionalInformationDetails</Role>
      <ShortName>Basis of Preparation and Significant Accounting Policies - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>9955535 - Disclosure - Segment Reporting - Additional Information - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/SegmentReportingAdditionalInformationNarrativeDetails</Role>
      <ShortName>Segment Reporting - Additional Information - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>9955536 - Disclosure - Segment Reporting - Summary of Gross and Net Written and Earned Premiums, Underwriting Results, Ratios and Reserves for Each of Company's Business Segments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/SegmentReportingSummaryofGrossandNetWrittenandEarnedPremiumsUnderwritingResultsRatiosandReservesforEachofCompanysBusinessSegmentsDetails</Role>
      <ShortName>Segment Reporting - Summary of Gross and Net Written and Earned Premiums, Underwriting Results, Ratios and Reserves for Each of Company's Business Segments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>9955537 - Disclosure - Segment Reporting - Summary of the Schedule of the Company's gross written premiums based on the location of the insured risk (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/SegmentReportingSummaryoftheScheduleoftheCompanysgrosswrittenpremiumsbasedonthelocationoftheinsuredriskDetails</Role>
      <ShortName>Segment Reporting - Summary of the Schedule of the Company's gross written premiums based on the location of the insured risk (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>9955538 - Disclosure - Investments - Summary of Investment Income (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/InvestmentsSummaryofInvestmentIncomeDetails</Role>
      <ShortName>Investments - Summary of Investment Income (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>9955539 - Disclosure - Investments - Net Realized and Unrealized Investment Gains and Losses and Change in Unrealized Gains and Losses on Investments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/InvestmentsNetRealizedandUnrealizedInvestmentGainsandLossesandChangeinUnrealizedGainsandLossesonInvestmentsDetails</Role>
      <ShortName>Investments - Net Realized and Unrealized Investment Gains and Losses and Change in Unrealized Gains and Losses on Investments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>9955540 - Disclosure - Investments - Cost, Gross Unrealized Gains and Losses, and Estimated Fair Value of Available for Sale Investments in Fixed Income Maturities and Short-Term Investments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/InvestmentsCostGrossUnrealizedGainsandLossesandEstimatedFairValueofAvailableforSaleInvestmentsinFixedIncomeMaturitiesandShortTermInvestmentsDetails</Role>
      <ShortName>Investments - Cost, Gross Unrealized Gains and Losses, and Estimated Fair Value of Available for Sale Investments in Fixed Income Maturities and Short-Term Investments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>9955541 - Disclosure - Investments - Cost, Gross Unrealized Gains and Losses, and Estimated Fair Value of Trading Investments in Fixed Income Maturities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/InvestmentsCostGrossUnrealizedGainsandLossesandEstimatedFairValueofTradingInvestmentsinFixedIncomeMaturitiesDetails</Role>
      <ShortName>Investments - Cost, Gross Unrealized Gains and Losses, and Estimated Fair Value of Trading Investments in Fixed Income Maturities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>9955542 - Disclosure - Investments - Equity Method Investments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/InvestmentsEquityMethodInvestmentsDetails</Role>
      <ShortName>Investments - Equity Method Investments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>9955543 - Disclosure - Investments - Summary of Fixed Maturities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/InvestmentsSummaryofFixedMaturitiesDetails</Role>
      <ShortName>Investments - Summary of Fixed Maturities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>75</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>9955544 - Disclosure - Investments - Aggregate Fair Value and Gross Unrealized Loss by Type of Security (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/InvestmentsAggregateFairValueandGrossUnrealizedLossbyTypeofSecurityDetails</Role>
      <ShortName>Investments - Aggregate Fair Value and Gross Unrealized Loss by Type of Security (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>76</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>9955545 - Disclosure - Investments - Additional Information (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/InvestmentsAdditionalInformationNarrativeDetails</Role>
      <ShortName>Investments - Additional Information (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>77</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>9955546 - Disclosure - Variable Interest Entities - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/VariableInterestEntitiesNarrativeDetails</Role>
      <ShortName>Variable Interest Entities - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>78</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>9955547 - Disclosure - Fair Value Measurements - Financial Assets Measured on Recurring Basis (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/FairValueMeasurementsFinancialAssetsMeasuredonRecurringBasisDetails</Role>
      <ShortName>Fair Value Measurements - Financial Assets Measured on Recurring Basis (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>79</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>9955549 - Disclosure - Fair Value Measurements Fair Value Measurements - Reconciliation of Level 3 Assets and Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/FairValueMeasurementsFairValueMeasurementsReconciliationofLevel3AssetsandLiabilitiesDetails</Role>
      <ShortName>Fair Value Measurements Fair Value Measurements - Reconciliation of Level 3 Assets and Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>80</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>9955550 - Disclosure - Fair Value Measurements - Inputs Used (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/FairValueMeasurementsInputsUsedDetails</Role>
      <ShortName>Fair Value Measurements - Inputs Used (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>81</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>9955551 - Disclosure - Fair Value Measurements - Additional Information - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/FairValueMeasurementsAdditionalInformationNarrativeDetails</Role>
      <ShortName>Fair Value Measurements - Additional Information - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>82</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>9955552 - Disclosure - Reinsurance - Summary of Assumed and Ceded Reinsurance on Premiums Written, Premiums Earned and Insurance Losses and Loss Adjustment Expenses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/ReinsuranceSummaryofAssumedandCededReinsuranceonPremiumsWrittenPremiumsEarnedandInsuranceLossesandLossAdjustmentExpensesDetails</Role>
      <ShortName>Reinsurance - Summary of Assumed and Ceded Reinsurance on Premiums Written, Premiums Earned and Insurance Losses and Loss Adjustment Expenses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>83</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R84.htm</HtmlFileName>
      <LongName>9955553 - Disclosure - Reinsurance - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/ReinsuranceAdditionalInformationDetails</Role>
      <ShortName>Reinsurance - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>84</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R85.htm</HtmlFileName>
      <LongName>9955554 - Disclosure - Derivative Contracts - Fair Value of Derivative Instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/DerivativeContractsFairValueofDerivativeInstrumentsDetails</Role>
      <ShortName>Derivative Contracts - Fair Value of Derivative Instruments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>85</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R86.htm</HtmlFileName>
      <LongName>9955555 - Disclosure - Derivative Contracts - Gain/(Loss) Recognized in Income on Derivative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/DerivativeContractsGainLossRecognizedinIncomeonDerivativeDetails</Role>
      <ShortName>Derivative Contracts - Gain/(Loss) Recognized in Income on Derivative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>86</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R87.htm</HtmlFileName>
      <LongName>9955556 - Disclosure - Derivative Contracts - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/DerivativeContractsAdditionalInformationDetails</Role>
      <ShortName>Derivative Contracts - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>87</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R88.htm</HtmlFileName>
      <LongName>9955557 - Disclosure - Deferred Policy Acquisition Costs (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/DeferredPolicyAcquisitionCostsDetails</Role>
      <ShortName>Deferred Policy Acquisition Costs (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.aspen.co/role/DeferredPolicyAcquisitionCostsTables</ParentRole>
      <Position>88</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R89.htm</HtmlFileName>
      <LongName>9955558 - Disclosure - Reserves for Losses and Adjustment Expenses - Reconciliation of Beginning and Ending Consolidated Loss and Loss Adjustment Expenses (LAE) Reserves (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/ReservesforLossesandAdjustmentExpensesReconciliationofBeginningandEndingConsolidatedLossandLossAdjustmentExpensesLAEReservesDetails</Role>
      <ShortName>Reserves for Losses and Adjustment Expenses - Reconciliation of Beginning and Ending Consolidated Loss and Loss Adjustment Expenses (LAE) Reserves (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>89</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R90.htm</HtmlFileName>
      <LongName>9955559 - Disclosure - Reserves for Losses and Adjustment Expenses - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/ReservesforLossesandAdjustmentExpensesAdditionalInformationDetails</Role>
      <ShortName>Reserves for Losses and Adjustment Expenses - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>90</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R91.htm</HtmlFileName>
      <LongName>9955560 - Disclosure - Reserves for Losses and Adjustment Expenses - Reconciliation of Reinsurance Recoverables on Unpaid Losses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/ReservesforLossesandAdjustmentExpensesReconciliationofReinsuranceRecoverablesonUnpaidLossesDetails</Role>
      <ShortName>Reserves for Losses and Adjustment Expenses - Reconciliation of Reinsurance Recoverables on Unpaid Losses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>91</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R92.htm</HtmlFileName>
      <LongName>9955561 - Disclosure - Reserves for Losses and Adjustment Expenses Short-duration Insurance Contracts, Claims by Accident Year (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/ReservesforLossesandAdjustmentExpensesShortdurationInsuranceContractsClaimsbyAccidentYearDetails</Role>
      <ShortName>Reserves for Losses and Adjustment Expenses Short-duration Insurance Contracts, Claims by Accident Year (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>92</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R93.htm</HtmlFileName>
      <LongName>9955562 - Disclosure - Reserves for Losses and Adjustment Expenses Short-duration insurance contracts - Reconciliation of Claims Development (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/ReservesforLossesandAdjustmentExpensesShortdurationinsurancecontractsReconciliationofClaimsDevelopmentDetails</Role>
      <ShortName>Reserves for Losses and Adjustment Expenses Short-duration insurance contracts - Reconciliation of Claims Development (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>93</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R94.htm</HtmlFileName>
      <LongName>9955563 - Disclosure - Reserves for Losses and Adjustment Expenses Short-duration Contracts - Historical Claims Duration (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/ReservesforLossesandAdjustmentExpensesShortdurationContractsHistoricalClaimsDurationDetails</Role>
      <ShortName>Reserves for Losses and Adjustment Expenses Short-duration Contracts - Historical Claims Duration (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>94</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R95.htm</HtmlFileName>
      <LongName>9955564 - Disclosure - Income Taxes - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/IncomeTaxesAdditionalInformationDetails</Role>
      <ShortName>Income Taxes - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>95</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R96.htm</HtmlFileName>
      <LongName>9955565 - Disclosure - Income Taxes - Summary of Total Income Tax (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/IncomeTaxesSummaryofTotalIncomeTaxDetails</Role>
      <ShortName>Income Taxes - Summary of Total Income Tax (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>96</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R97.htm</HtmlFileName>
      <LongName>9955566 - Disclosure - Income Taxes - Income/(Loss) Before Tax and Income Tax Expense/(Benefit) Attributable to that Income (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/IncomeTaxesIncomeLossBeforeTaxandIncomeTaxExpenseBenefitAttributabletothatIncomeDetails</Role>
      <ShortName>Income Taxes - Income/(Loss) Before Tax and Income Tax Expense/(Benefit) Attributable to that Income (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>97</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R98.htm</HtmlFileName>
      <LongName>9955567 - Disclosure - Income Taxes - New Income Tax Reconciliation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/IncomeTaxesNewIncomeTaxReconciliationDetails</Role>
      <ShortName>Income Taxes - New Income Tax Reconciliation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>98</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R99.htm</HtmlFileName>
      <LongName>9955568 - Disclosure - Income Taxes - Income Tax Reconciliation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/IncomeTaxesIncomeTaxReconciliationDetails</Role>
      <ShortName>Income Taxes - Income Tax Reconciliation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>99</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R100.htm</HtmlFileName>
      <LongName>9955569 - Disclosure - Income Taxes - Tax Effects of Deferred Tax Assets and Deferred Tax Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/IncomeTaxesTaxEffectsofDeferredTaxAssetsandDeferredTaxLiabilitiesDetails</Role>
      <ShortName>Income Taxes - Tax Effects of Deferred Tax Assets and Deferred Tax Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>100</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R101.htm</HtmlFileName>
      <LongName>9955570 - Disclosure - Summary of Income Tax Payments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/SummaryofIncomeTaxPaymentsDetails</Role>
      <ShortName>Summary of Income Tax Payments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>101</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R102.htm</HtmlFileName>
      <LongName>9955571 - Disclosure - Capital Structure - Summary of Authorized and Issued Share Capital (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/CapitalStructureSummaryofAuthorizedandIssuedShareCapitalDetails</Role>
      <ShortName>Capital Structure - Summary of Authorized and Issued Share Capital (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>102</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R103.htm</HtmlFileName>
      <LongName>9955572 - Disclosure - Capital Structure - Summary of Authorized and Issued Share Capital (Details)(Phantom)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/CapitalStructureSummaryofAuthorizedandIssuedShareCapitalDetailsPhantom</Role>
      <ShortName>Capital Structure - Summary of Authorized and Issued Share Capital (Details)(Phantom)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>103</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R104.htm</HtmlFileName>
      <LongName>9955574 - Disclosure - Capital Structure - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/CapitalStructureAdditionalInformationDetails</Role>
      <ShortName>Capital Structure - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>104</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R105.htm</HtmlFileName>
      <LongName>9955575 - Disclosure - Earnings Per Share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/EarningsPerShareDetails</Role>
      <ShortName>Earnings Per Share (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.aspen.co/role/EarningsPerShareTables</ParentRole>
      <Position>105</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R106.htm</HtmlFileName>
      <LongName>9955576 - Disclosure - Statutory Requirements and Dividends Restrictions - Summary of Statutory Requirements and Dividends Restrictions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/StatutoryRequirementsandDividendsRestrictionsSummaryofStatutoryRequirementsandDividendsRestrictionsDetails</Role>
      <ShortName>Statutory Requirements and Dividends Restrictions - Summary of Statutory Requirements and Dividends Restrictions (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>106</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R107.htm</HtmlFileName>
      <LongName>9955577 - Disclosure - Statutory Requirements and Dividends Restrictions - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/StatutoryRequirementsandDividendsRestrictionsAdditionalInformationDetails</Role>
      <ShortName>Statutory Requirements and Dividends Restrictions - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>107</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R108.htm</HtmlFileName>
      <LongName>9955578 - Disclosure - Dividends - Summary of Declared Dividends (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/DividendsSummaryofDeclaredDividendsDetails</Role>
      <ShortName>Dividends - Summary of Declared Dividends (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>108</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R109.htm</HtmlFileName>
      <LongName>9955579 - Disclosure - Retirement Plans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/RetirementPlansDetails</Role>
      <ShortName>Retirement Plans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.aspen.co/role/RetirementPlans</ParentRole>
      <Position>109</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R110.htm</HtmlFileName>
      <LongName>9955580 - Disclosure - Share-Based Payments - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/ShareBasedPaymentsNarrativeDetails</Role>
      <ShortName>Share-Based Payments - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>110</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R111.htm</HtmlFileName>
      <LongName>9955581 - Disclosure - Share-Based Payments - Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/ShareBasedPaymentsDisclosureofShareBasedCompensationArrangementsbyShareBasedPaymentAwardDetails</Role>
      <ShortName>Share-Based Payments - Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>111</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R112.htm</HtmlFileName>
      <LongName>9955582 - Disclosure - Intangible Assets - Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/IntangibleAssetsInformationDetails</Role>
      <ShortName>Intangible Assets - Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>112</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R113.htm</HtmlFileName>
      <LongName>9955583 - Disclosure - Operating Leases - Schedule of Operating Lease Costs (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/OperatingLeasesScheduleofOperatingLeaseCostsDetails</Role>
      <ShortName>Operating Leases - Schedule of Operating Lease Costs (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>113</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R114.htm</HtmlFileName>
      <LongName>9955584 - Disclosure - Operating Leases - Schedule of Operating Lease Liability, Maturity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/OperatingLeasesScheduleofOperatingLeaseLiabilityMaturityDetails</Role>
      <ShortName>Operating Leases - Schedule of Operating Lease Liability, Maturity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>114</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R115.htm</HtmlFileName>
      <LongName>9955585 - Disclosure - Operating Leases - Schedule of Operating Leases Cash Flows (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/OperatingLeasesScheduleofOperatingLeasesCashFlowsDetails</Role>
      <ShortName>Operating Leases - Schedule of Operating Leases Cash Flows (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>115</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R116.htm</HtmlFileName>
      <LongName>9955586 - Disclosure - Operating Leases - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/OperatingLeasesAdditionalInformationDetails</Role>
      <ShortName>Operating Leases - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>116</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R117.htm</HtmlFileName>
      <LongName>9955587 - Disclosure - Related Party Transactions - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/RelatedPartyTransactionsNarrativeDetails</Role>
      <ShortName>Related Party Transactions - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>117</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R118.htm</HtmlFileName>
      <LongName>9955588 - Disclosure - Commitments and Contingencies - Schedule of Company's Restricted Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/CommitmentsandContingenciesScheduleofCompanysRestrictedAssetsDetails</Role>
      <ShortName>Commitments and Contingencies - Schedule of Company's Restricted Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>118</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R119.htm</HtmlFileName>
      <LongName>9955589 - Disclosure - Commitments and Contingencies - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/CommitmentsandContingenciesAdditionalInformationDetails</Role>
      <ShortName>Commitments and Contingencies - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>119</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R120.htm</HtmlFileName>
      <LongName>9955590 - Disclosure - Concentration of Credit Risk - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/ConcentrationofCreditRiskAdditionalInformationDetails</Role>
      <ShortName>Concentration of Credit Risk - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>120</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R121.htm</HtmlFileName>
      <LongName>9955591 - Disclosure - Reclassifications from Accumulated Other Comprehensive Income - Schedule of Accumulated Other Comprehensive Income Reclassification (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/ReclassificationsfromAccumulatedOtherComprehensiveIncomeScheduleofAccumulatedOtherComprehensiveIncomeReclassificationDetails</Role>
      <ShortName>Reclassifications from Accumulated Other Comprehensive Income - Schedule of Accumulated Other Comprehensive Income Reclassification (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>121</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R122.htm</HtmlFileName>
      <LongName>9955592 - Disclosure - Credit Facilities and Long-Term Debt - Summary of Contractual Obligations Under Long-term Debts (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/CreditFacilitiesandLongTermDebtSummaryofContractualObligationsUnderLongtermDebtsDetails</Role>
      <ShortName>Credit Facilities and Long-Term Debt - Summary of Contractual Obligations Under Long-term Debts (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>122</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R123.htm</HtmlFileName>
      <LongName>9955593 - Disclosure - Credit Facilities and Long-Term Debt - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/CreditFacilitiesandLongTermDebtAdditionalInformationDetails</Role>
      <ShortName>Credit Facilities and Long-Term Debt - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>123</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R124.htm</HtmlFileName>
      <LongName>9955594 - Disclosure - Credit Losses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/CreditLossesDetails</Role>
      <ShortName>Credit Losses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.aspen.co/role/CreditLossesTables</ParentRole>
      <Position>124</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R125.htm</HtmlFileName>
      <LongName>9955595 - Disclosure - Subsequent Events - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/SubsequentEventsNarrativeDetails</Role>
      <ShortName>Subsequent Events - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>125</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R126.htm</HtmlFileName>
      <LongName>9955596 - Disclosure - Subsequent Events- Schedule of Dividends Payable (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/SubsequentEventsScheduleofDividendsPayableDetails</Role>
      <ShortName>Subsequent Events- Schedule of Dividends Payable (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>126</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R127.htm</HtmlFileName>
      <LongName>9955597 - Disclosure - Schedule I - Investments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/ScheduleIInvestmentsDetails</Role>
      <ShortName>Schedule I - Investments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.aspen.co/role/ScheduleIInvestments</ParentRole>
      <Position>127</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R128.htm</HtmlFileName>
      <LongName>9955598 - Disclosure - Schedule II - Condensed Financial Information of Registrant Balance Sheets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/ScheduleIICondensedFinancialInformationofRegistrantBalanceSheetsDetails</Role>
      <ShortName>Schedule II - Condensed Financial Information of Registrant Balance Sheets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>128</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R129.htm</HtmlFileName>
      <LongName>9955599 - Disclosure - Schedule II - Condensed Financial Information of Registrant Statements of Operations and Comprehensive Income (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/ScheduleIICondensedFinancialInformationofRegistrantStatementsofOperationsandComprehensiveIncomeDetails</Role>
      <ShortName>Schedule II - Condensed Financial Information of Registrant Statements of Operations and Comprehensive Income (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>129</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R130.htm</HtmlFileName>
      <LongName>9955600 - Disclosure - Schedule II - Condensed Financial Information of Registrant Statements of Cash Flows (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/ScheduleIICondensedFinancialInformationofRegistrantStatementsofCashFlowsDetails</Role>
      <ShortName>Schedule II - Condensed Financial Information of Registrant Statements of Cash Flows (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>130</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R131.htm</HtmlFileName>
      <LongName>9955601 - Disclosure - Schedule III - Supplementary Insurance Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/ScheduleIIISupplementaryInsuranceInformationDetails</Role>
      <ShortName>Schedule III - Supplementary Insurance Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.aspen.co/role/ScheduleIIISupplementaryInsuranceInformation</ParentRole>
      <Position>131</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R132.htm</HtmlFileName>
      <LongName>9955602 - Disclosure - Schedule IV - Reinsurance Premiums Written and Premiums Earned (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/ScheduleIVReinsurancePremiumsWrittenandPremiumsEarnedDetails</Role>
      <ShortName>Schedule IV - Reinsurance Premiums Written and Premiums Earned (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>132</Position>
    </Report>
    <Report instance="ahl-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R133.htm</HtmlFileName>
      <LongName>9955603 - Disclosure - Schedule V - Valuation and Qualifying Accounts (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aspen.co/role/ScheduleVValuationandQualifyingAccountsDetails</Role>
      <ShortName>Schedule V - Valuation and Qualifying Accounts (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.aspen.co/role/ScheduleVValuationandQualifyingAccounts</ParentRole>
      <Position>133</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File doctype="20-F" isDefinitelyFs="true" isUsgaap="true" original="ahl-20251231.htm">ahl-20251231.htm</File>
    <File>ahl-20251231.xsd</File>
    <File>ahl-20251231_cal.xml</File>
    <File>ahl-20251231_def.xml</File>
    <File>ahl-20251231_lab.xml</File>
    <File>ahl-20251231_pre.xml</File>
  </InputFiles>
  <SupplementalFiles>
    <File>ahl-20251231_g1.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="6">http://fasb.org/srt/2025</BaseTaxonomy>
    <BaseTaxonomy items="3615">http://fasb.org/us-gaap/2025</BaseTaxonomy>
    <BaseTaxonomy items="16">http://xbrl.sec.gov/cyd/2025</BaseTaxonomy>
    <BaseTaxonomy items="48">http://xbrl.sec.gov/dei/2025</BaseTaxonomy>
    <BaseTaxonomy items="1">http://xbrl.sec.gov/ecd/2025</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
