<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>77</ContextCount>
  <ElementCount>53</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>16</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>3</UnitCount>
  <MyReports>
    <Report instance="kmpr-20260615.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0000001 - Document - Cover</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kemper.com/role/Cover</Role>
      <ShortName>Cover</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="kmpr-20260615.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>0000002 - Statement - Statements of Net Assets Available for Benefits</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kemper.com/role/StatementsofNetAssetsAvailableforBenefits</Role>
      <ShortName>Statements of Net Assets Available for Benefits</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="kmpr-20260615.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>0000003 - Statement - Statement of Changes in Net Assets Available for Benefits</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kemper.com/role/StatementofChangesinNetAssetsAvailableforBenefits</Role>
      <ShortName>Statement of Changes in Net Assets Available for Benefits</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="kmpr-20260615.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>0000004 - Disclosure - Plan Description</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kemper.com/role/PlanDescription</Role>
      <ShortName>Plan Description</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="kmpr-20260615.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>0000005 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies and Changes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kemper.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesandChanges</Role>
      <ShortName>Basis of Presentation and Summary of Significant Accounting Policies and Changes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="kmpr-20260615.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>0000006 - Disclosure - Fair Value Measurements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kemper.com/role/FairValueMeasurements</Role>
      <ShortName>Fair Value Measurements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="kmpr-20260615.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>0000007 - Disclosure - Federal Income Tax Status</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kemper.com/role/FederalIncomeTaxStatus</Role>
      <ShortName>Federal Income Tax Status</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="kmpr-20260615.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>0000008 - Disclosure - Exempt Party-in-interest Transactions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kemper.com/role/ExemptPartyininterestTransactions</Role>
      <ShortName>Exempt Party-in-interest Transactions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="kmpr-20260615.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>0000009 - Disclosure - Subsequent Events</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kemper.com/role/SubsequentEvents</Role>
      <ShortName>Subsequent Events</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="kmpr-20260615.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>0000010 - Disclosure - Form 5500, Schedule H, Part IV, Line 4i - Schedule of Assets (Held at End of Year)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kemper.com/role/Form5500ScheduleHPartIVLine4iScheduleofAssetsHeldatEndofYear</Role>
      <ShortName>Form 5500, Schedule H, Part IV, Line 4i - Schedule of Assets (Held at End of Year)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="kmpr-20260615.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>0000011 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies and Changes (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kemper.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesandChangesPolicies</Role>
      <ShortName>Basis of Presentation and Summary of Significant Accounting Policies and Changes (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://kemper.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesandChanges</ParentRole>
      <Position>11</Position>
    </Report>
    <Report instance="kmpr-20260615.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>0000012 - Disclosure - Fair Value Measurements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kemper.com/role/FairValueMeasurementsTables</Role>
      <ShortName>Fair Value Measurements (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://kemper.com/role/FairValueMeasurements</ParentRole>
      <Position>12</Position>
    </Report>
    <Report instance="kmpr-20260615.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>0000013 - Disclosure - Plan Description (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kemper.com/role/PlanDescriptionDetails</Role>
      <ShortName>Plan Description (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://kemper.com/role/PlanDescription</ParentRole>
      <Position>13</Position>
    </Report>
    <Report instance="kmpr-20260615.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>0000014 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies and Changes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kemper.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesandChangesDetails</Role>
      <ShortName>Basis of Presentation and Summary of Significant Accounting Policies and Changes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://kemper.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesandChangesPolicies</ParentRole>
      <Position>14</Position>
    </Report>
    <Report instance="kmpr-20260615.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>0000015 - Disclosure - Fair Value Measurements (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kemper.com/role/FairValueMeasurementsDetails</Role>
      <ShortName>Fair Value Measurements (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://kemper.com/role/FairValueMeasurementsTables</ParentRole>
      <Position>15</Position>
    </Report>
    <Report instance="kmpr-20260615.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>0000016 - Disclosure - Exempt Party-in-interest Transactions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kemper.com/role/ExemptPartyininterestTransactionsDetails</Role>
      <ShortName>Exempt Party-in-interest Transactions (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://kemper.com/role/ExemptPartyininterestTransactions</ParentRole>
      <Position>16</Position>
    </Report>
    <Report instance="kmpr-20260615.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>0000017 - Disclosure - Form 5500, Schedule H, Part IV, Line 4i - Schedule of Assets (Held at End of Year) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kemper.com/role/Form5500ScheduleHPartIVLine4iScheduleofAssetsHeldatEndofYearDetails</Role>
      <ShortName>Form 5500, Schedule H, Part IV, Line 4i - Schedule of Assets (Held at End of Year) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://kemper.com/role/Form5500ScheduleHPartIVLine4iScheduleofAssetsHeldatEndofYear</ParentRole>
      <Position>17</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="11-K" isDefinitelyFs="true" isUsgaap="true" original="kmpr-20260615.htm">kmpr-20260615.htm</File>
    <File>kmpr-20260615.xsd</File>
    <File>kmpr-20260615_cal.xml</File>
    <File>kmpr-20260615_def.xml</File>
    <File>kmpr-20260615_lab.xml</File>
    <File>kmpr-20260615_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="131">http://fasb.org/us-gaap-ebp/2026</BaseTaxonomy>
    <BaseTaxonomy items="9">http://xbrl.sec.gov/dei/2026</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
