<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.25.2</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>848</ContextCount>
  <ElementCount>500</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>176</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>10</UnitCount>
  <MyReports>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0000001 - Document - Cover Page</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/CoverPage</Role>
      <ShortName>Cover Page</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>9952151 - Statement - CONSOLIDATED BALANCE SHEET</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/CONSOLIDATEDBALANCESHEET</Role>
      <ShortName>CONSOLIDATED BALANCE SHEET</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>9952152 - Statement - CONSOLIDATED BALANCE SHEET (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/CONSOLIDATEDBALANCESHEETParenthetical</Role>
      <ShortName>CONSOLIDATED BALANCE SHEET (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>9952153 - Statement - CONSOLIDATED STATEMENT OF OPERATIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/CONSOLIDATEDSTATEMENTOFOPERATIONS</Role>
      <ShortName>CONSOLIDATED STATEMENT OF OPERATIONS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>9952154 - Statement - CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/CONSOLIDATEDSTATEMENTOFCOMPREHENSIVEINCOMELOSS</Role>
      <ShortName>CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>9952155 - Statement - CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/CONSOLIDATEDSTATEMENTOFSHAREHOLDERSEQUITY</Role>
      <ShortName>CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>9952156 - Statement - CONSOLIDATED STATEMENT OF CASH FLOWS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/CONSOLIDATEDSTATEMENTOFCASHFLOWS</Role>
      <ShortName>CONSOLIDATED STATEMENT OF CASH FLOWS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>9952157 - Disclosure - BUSINESS, BASIS OF PRESENTATION, AND SIGNIFICANT ACCOUNTING POLICIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/BUSINESSBASISOFPRESENTATIONANDSIGNIFICANTACCOUNTINGPOLICIES</Role>
      <ShortName>BUSINESS, BASIS OF PRESENTATION, AND SIGNIFICANT ACCOUNTING POLICIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>9952158 - Disclosure - INVESTMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/INVESTMENTS</Role>
      <ShortName>INVESTMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>9952159 - Disclosure - FAIR VALUE MEASUREMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/FAIRVALUEMEASUREMENTS</Role>
      <ShortName>FAIR VALUE MEASUREMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>9952160 - Disclosure - LIABILITIES FOR INSURANCE PRODUCTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/LIABILITIESFORINSURANCEPRODUCTS</Role>
      <ShortName>LIABILITIES FOR INSURANCE PRODUCTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>9952161 - Disclosure - DEFERRED ACQUISITION COSTS, PRESENT VALUE OF FUTURE PROFITS AND SALES INDUCEMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/DEFERREDACQUISITIONCOSTSPRESENTVALUEOFFUTUREPROFITSANDSALESINDUCEMENTS</Role>
      <ShortName>DEFERRED ACQUISITION COSTS, PRESENT VALUE OF FUTURE PROFITS AND SALES INDUCEMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>9952162 - Disclosure - EARNINGS PER SHARE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/EARNINGSPERSHARE</Role>
      <ShortName>EARNINGS PER SHARE</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>9952163 - Disclosure - BUSINESS SEGMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/BUSINESSSEGMENTS</Role>
      <ShortName>BUSINESS SEGMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>9952164 - Disclosure - DERIVATIVES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/DERIVATIVES</Role>
      <ShortName>DERIVATIVES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>9952165 - Disclosure - REINSURANCE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/REINSURANCE</Role>
      <ShortName>REINSURANCE</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>9952166 - Disclosure - INCOME TAXES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/INCOMETAXES</Role>
      <ShortName>INCOME TAXES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>9952167 - Disclosure - NOTES PAYABLE - DIRECT CORPORATE OBLIGATIONS</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.cnoinc.com/role/NOTESPAYABLEDIRECTCORPORATEOBLIGATIONS</Role>
      <ShortName>NOTES PAYABLE - DIRECT CORPORATE OBLIGATIONS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>9952168 - Disclosure - INVESTMENT BORROWINGS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/INVESTMENTBORROWINGS</Role>
      <ShortName>INVESTMENT BORROWINGS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>9952169 - Disclosure - SHAREHOLDERS' EQUITY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/SHAREHOLDERSEQUITY</Role>
      <ShortName>SHAREHOLDERS' EQUITY</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>9952170 - Disclosure - LITIGATION AND OTHER LEGAL PROCEEDINGS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/LITIGATIONANDOTHERLEGALPROCEEDINGS</Role>
      <ShortName>LITIGATION AND OTHER LEGAL PROCEEDINGS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>9952171 - Disclosure - CONSOLIDATED STATEMENT OF CASH FLOWS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/CONSOLIDATEDSTATEMENTOFCASHFLOWS_1</Role>
      <ShortName>CONSOLIDATED STATEMENT OF CASH FLOWS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>9952172 - Disclosure - INVESTMENTS IN VARIABLE INTEREST ENTITIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/INVESTMENTSINVARIABLEINTERESTENTITIES</Role>
      <ShortName>INVESTMENTS IN VARIABLE INTEREST ENTITIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>995445 - Disclosure - Insider Trading Arrangements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements</Role>
      <ShortName>Insider Trading Arrangements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>9955511 - Disclosure - BUSINESS, BASIS OF PRESENTATION, AND SIGNIFICANT ACCOUNTING POLICIES (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/BUSINESSBASISOFPRESENTATIONANDSIGNIFICANTACCOUNTINGPOLICIESPolicies</Role>
      <ShortName>BUSINESS, BASIS OF PRESENTATION, AND SIGNIFICANT ACCOUNTING POLICIES (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>9955512 - Disclosure - BUSINESS, BASIS OF PRESENTATION, AND SIGNIFICANT ACCOUNTING POLICIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/BUSINESSBASISOFPRESENTATIONANDSIGNIFICANTACCOUNTINGPOLICIESTables</Role>
      <ShortName>BUSINESS, BASIS OF PRESENTATION, AND SIGNIFICANT ACCOUNTING POLICIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.cnoinc.com/role/BUSINESSBASISOFPRESENTATIONANDSIGNIFICANTACCOUNTINGPOLICIES</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>9955513 - Disclosure - INVESTMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/INVESTMENTSTables</Role>
      <ShortName>INVESTMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.cnoinc.com/role/INVESTMENTS</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>9955514 - Disclosure - FAIR VALUE MEASUREMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/FAIRVALUEMEASUREMENTSTables</Role>
      <ShortName>FAIR VALUE MEASUREMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.cnoinc.com/role/FAIRVALUEMEASUREMENTS</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>9955515 - Disclosure - LIABILITIES FOR INSURANCE PRODUCTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/LIABILITIESFORINSURANCEPRODUCTSTables</Role>
      <ShortName>LIABILITIES FOR INSURANCE PRODUCTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.cnoinc.com/role/LIABILITIESFORINSURANCEPRODUCTS</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>9955516 - Disclosure - DEFERRED ACQUISITION COSTS, PRESENT VALUE OF FUTURE PROFITS AND SALES INDUCEMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/DEFERREDACQUISITIONCOSTSPRESENTVALUEOFFUTUREPROFITSANDSALESINDUCEMENTSTables</Role>
      <ShortName>DEFERRED ACQUISITION COSTS, PRESENT VALUE OF FUTURE PROFITS AND SALES INDUCEMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.cnoinc.com/role/DEFERREDACQUISITIONCOSTSPRESENTVALUEOFFUTUREPROFITSANDSALESINDUCEMENTS</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>9955517 - Disclosure - EARNINGS PER SHARE (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/EARNINGSPERSHARETables</Role>
      <ShortName>EARNINGS PER SHARE (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.cnoinc.com/role/EARNINGSPERSHARE</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>9955518 - Disclosure - BUSINESS SEGMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/BUSINESSSEGMENTSTables</Role>
      <ShortName>BUSINESS SEGMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.cnoinc.com/role/BUSINESSSEGMENTS</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>9955519 - Disclosure - DERIVATIVES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/DERIVATIVESTables</Role>
      <ShortName>DERIVATIVES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.cnoinc.com/role/DERIVATIVES</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>9955520 - Disclosure - INCOME TAXES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/INCOMETAXESTables</Role>
      <ShortName>INCOME TAXES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.cnoinc.com/role/INCOMETAXES</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>9955521 - Disclosure - NOTES PAYABLE - DIRECT CORPORATE OBLIGATIONS (Tables)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.cnoinc.com/role/NOTESPAYABLEDIRECTCORPORATEOBLIGATIONSTables</Role>
      <ShortName>NOTES PAYABLE - DIRECT CORPORATE OBLIGATIONS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.cnoinc.com/role/NOTESPAYABLEDIRECTCORPORATEOBLIGATIONS</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>9955522 - Disclosure - INVESTMENT BORROWINGS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/INVESTMENTBORROWINGSTables</Role>
      <ShortName>INVESTMENT BORROWINGS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.cnoinc.com/role/INVESTMENTBORROWINGS</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>9955523 - Disclosure - SHAREHOLDERS' EQUITY (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/SHAREHOLDERSEQUITYTables</Role>
      <ShortName>SHAREHOLDERS' EQUITY (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.cnoinc.com/role/SHAREHOLDERSEQUITY</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>9955524 - Disclosure - CONSOLIDATED STATEMENT OF CASH FLOWS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/CONSOLIDATEDSTATEMENTOFCASHFLOWSTables</Role>
      <ShortName>CONSOLIDATED STATEMENT OF CASH FLOWS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.cnoinc.com/role/CONSOLIDATEDSTATEMENTOFCASHFLOWS_1</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>9955525 - Disclosure - INVESTMENTS IN VARIABLE INTEREST ENTITIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/INVESTMENTSINVARIABLEINTERESTENTITIESTables</Role>
      <ShortName>INVESTMENTS IN VARIABLE INTEREST ENTITIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.cnoinc.com/role/INVESTMENTSINVARIABLEINTERESTENTITIES</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>9955526 - Disclosure - BUSINESS, BASIS OF PRESENTATION, AND SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/BUSINESSBASISOFPRESENTATIONANDSIGNIFICANTACCOUNTINGPOLICIESNarrativeDetails</Role>
      <ShortName>BUSINESS, BASIS OF PRESENTATION, AND SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.cnoinc.com/role/BUSINESSBASISOFPRESENTATIONANDSIGNIFICANTACCOUNTINGPOLICIESTables</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>9955527 - Disclosure - BUSINESS AND BASIS OF PRESENTATION - Errors on Prior Period (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/BUSINESSANDBASISOFPRESENTATIONErrorsonPriorPeriodDetails</Role>
      <ShortName>BUSINESS AND BASIS OF PRESENTATION - Errors on Prior Period (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>9955528 - Disclosure - BUSINESS AND BASIS OF PRESENTATION - Consolidated Statement of Operations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/BUSINESSANDBASISOFPRESENTATIONConsolidatedStatementofOperationsDetails</Role>
      <ShortName>BUSINESS AND BASIS OF PRESENTATION - Consolidated Statement of Operations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>9955529 - Disclosure - INVESTMENTS - SCHEDULE OF AMORTIZED COST, GROSS UNREALIZED GAINS AND LOSSES, ESTIMATED FAIR VALUE, AND ALLOWANCE FOR CREDIT LOSSES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/INVESTMENTSSCHEDULEOFAMORTIZEDCOSTGROSSUNREALIZEDGAINSANDLOSSESESTIMATEDFAIRVALUEANDALLOWANCEFORCREDITLOSSESDetails</Role>
      <ShortName>INVESTMENTS - SCHEDULE OF AMORTIZED COST, GROSS UNREALIZED GAINS AND LOSSES, ESTIMATED FAIR VALUE, AND ALLOWANCE FOR CREDIT LOSSES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>9955530 - Disclosure - INVESTMENTS - SUMMARY OF INVESTMENTS BY CONTRACTUAL MATURITY (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/INVESTMENTSSUMMARYOFINVESTMENTSBYCONTRACTUALMATURITYDetails</Role>
      <ShortName>INVESTMENTS - SUMMARY OF INVESTMENTS BY CONTRACTUAL MATURITY (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>9955531 - Disclosure - INVESTMENTS - SUMMARY OF INVESTMENTS WITH UNREALIZED LOSSES BY INVESTMENT CATEGORY (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/INVESTMENTSSUMMARYOFINVESTMENTSWITHUNREALIZEDLOSSESBYINVESTMENTCATEGORYDetails</Role>
      <ShortName>INVESTMENTS - SUMMARY OF INVESTMENTS WITH UNREALIZED LOSSES BY INVESTMENT CATEGORY (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>9955532 - Disclosure - INVESTMENTS - SUMMARY OF CHANGES IN THE ALLOWANCE FOR CURRENT EXPECTED CREDIT LOSSES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/INVESTMENTSSUMMARYOFCHANGESINTHEALLOWANCEFORCURRENTEXPECTEDCREDITLOSSESDetails</Role>
      <ShortName>INVESTMENTS - SUMMARY OF CHANGES IN THE ALLOWANCE FOR CURRENT EXPECTED CREDIT LOSSES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>9955533 - Disclosure - INVESTMENTS - NARRATIVE (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/INVESTMENTSNARRATIVEDetails</Role>
      <ShortName>INVESTMENTS - NARRATIVE (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>9955534 - Disclosure - INVESTMENTS - SUMMARY OF CARRYING VALUE AND ESTIMATED FAIR VALUE OF OUTSTANDING COMMERCIAL MORTGAGE LOANS AND UNDERLYING COLLATERAL (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/INVESTMENTSSUMMARYOFCARRYINGVALUEANDESTIMATEDFAIRVALUEOFOUTSTANDINGCOMMERCIALMORTGAGELOANSANDUNDERLYINGCOLLATERALDetails</Role>
      <ShortName>INVESTMENTS - SUMMARY OF CARRYING VALUE AND ESTIMATED FAIR VALUE OF OUTSTANDING COMMERCIAL MORTGAGE LOANS AND UNDERLYING COLLATERAL (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>9955535 - Disclosure - INVESTMENTS - SUMMARY OF CHANGES IN THE ALLOWANCE FOR CURRENT EXPECTED CREDIT LOSSES RELATED TO MORTGAGE LOANS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/INVESTMENTSSUMMARYOFCHANGESINTHEALLOWANCEFORCURRENTEXPECTEDCREDITLOSSESRELATEDTOMORTGAGELOANSDetails</Role>
      <ShortName>INVESTMENTS - SUMMARY OF CHANGES IN THE ALLOWANCE FOR CURRENT EXPECTED CREDIT LOSSES RELATED TO MORTGAGE LOANS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>9955536 - Disclosure - INVESTMENTS - TOTAL INVESTMENT GAINS (LOSSES) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/INVESTMENTSTOTALINVESTMENTGAINSLOSSESDetails</Role>
      <ShortName>INVESTMENTS - TOTAL INVESTMENT GAINS (LOSSES) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>9955537 - Disclosure - FAIR VALUE MEASUREMENTS - NARRATIVE (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/FAIRVALUEMEASUREMENTSNARRATIVEDetails</Role>
      <ShortName>FAIR VALUE MEASUREMENTS - NARRATIVE (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>9955538 - Disclosure - FAIR VALUE MEASUREMENTS - MEASUREMENTS BY INPUT LEVEL (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/FAIRVALUEMEASUREMENTSMEASUREMENTSBYINPUTLEVELDetails</Role>
      <ShortName>FAIR VALUE MEASUREMENTS - MEASUREMENTS BY INPUT LEVEL (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>9955539 - Disclosure - FAIR VALUE MEASUREMENTS - SIGNIFICANT UNOBSERVABLE (LEVEL 3) INPUTS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/FAIRVALUEMEASUREMENTSSIGNIFICANTUNOBSERVABLELEVEL3INPUTSDetails</Role>
      <ShortName>FAIR VALUE MEASUREMENTS - SIGNIFICANT UNOBSERVABLE (LEVEL 3) INPUTS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>9955540 - Disclosure - FAIR VALUE MEASUREMENTS - CHANGES IN VALUE OF EMBEDDED DERIVATIVES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/FAIRVALUEMEASUREMENTSCHANGESINVALUEOFEMBEDDEDDERIVATIVESDetails</Role>
      <ShortName>FAIR VALUE MEASUREMENTS - CHANGES IN VALUE OF EMBEDDED DERIVATIVES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>9955541 - Disclosure - FAIR VALUE MEASUREMENTS - FAIR VALUE INPUTS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/FAIRVALUEMEASUREMENTSFAIRVALUEINPUTSDetails</Role>
      <ShortName>FAIR VALUE MEASUREMENTS - FAIR VALUE INPUTS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>9955542 - Disclosure - FAIR VALUE MEASUREMENTS - RECURRING BASIS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/FAIRVALUEMEASUREMENTSRECURRINGBASISDetails</Role>
      <ShortName>FAIR VALUE MEASUREMENTS - RECURRING BASIS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>9955543 - Disclosure - LIABILITIES FOR INSURANCE PRODUCTS - SUMMARY OF CHANGES IN LIABILITY FOR FUTURE POLICY BENEFITS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/LIABILITIESFORINSURANCEPRODUCTSSUMMARYOFCHANGESINLIABILITYFORFUTUREPOLICYBENEFITSDetails</Role>
      <ShortName>LIABILITIES FOR INSURANCE PRODUCTS - SUMMARY OF CHANGES IN LIABILITY FOR FUTURE POLICY BENEFITS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>9955544 - Disclosure - LIABILITIES FOR INSURANCE PRODUCTS - CHANGES IN MARKET RISK BENEFITS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/LIABILITIESFORINSURANCEPRODUCTSCHANGESINMARKETRISKBENEFITSDetails</Role>
      <ShortName>LIABILITIES FOR INSURANCE PRODUCTS - CHANGES IN MARKET RISK BENEFITS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>9955545 - Disclosure - LIABILITIES FOR INSURANCE PRODUCTS - SUMMARY OF AMOUNT OF REVENUE AND INTEREST, TRADITIONAL AND LIMITED PAYMENT CONTRACTS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/LIABILITIESFORINSURANCEPRODUCTSSUMMARYOFAMOUNTOFREVENUEANDINTERESTTRADITIONALANDLIMITEDPAYMENTCONTRACTSDetails</Role>
      <ShortName>LIABILITIES FOR INSURANCE PRODUCTS - SUMMARY OF AMOUNT OF REVENUE AND INTEREST, TRADITIONAL AND LIMITED PAYMENT CONTRACTS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>9955546 - Disclosure - LIABILITIES FOR INSURANCE PRODUCTS - SUMMARY OF AMOUNT OF UNDISCOUNTED AND DISCOUNTED EXPECTED GROSS PREMIUMS AND EXPECTED FUTURE BENEFITS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/LIABILITIESFORINSURANCEPRODUCTSSUMMARYOFAMOUNTOFUNDISCOUNTEDANDDISCOUNTEDEXPECTEDGROSSPREMIUMSANDEXPECTEDFUTUREBENEFITSDetails</Role>
      <ShortName>LIABILITIES FOR INSURANCE PRODUCTS - SUMMARY OF AMOUNT OF UNDISCOUNTED AND DISCOUNTED EXPECTED GROSS PREMIUMS AND EXPECTED FUTURE BENEFITS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>9955547 - Disclosure - LIABILITIES FOR INSURANCE PRODUCTS - WEIGHTED AVERAGE DURATIONS OF LIABILITY (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/LIABILITIESFORINSURANCEPRODUCTSWEIGHTEDAVERAGEDURATIONSOFLIABILITYDetails</Role>
      <ShortName>LIABILITIES FOR INSURANCE PRODUCTS - WEIGHTED AVERAGE DURATIONS OF LIABILITY (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>9955548 - Disclosure - LIABILITIES FOR INSURANCE PRODUCTS - WEIGHTED AVERAGE INTEREST RATE (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/LIABILITIESFORINSURANCEPRODUCTSWEIGHTEDAVERAGEINTERESTRATEDetails</Role>
      <ShortName>LIABILITIES FOR INSURANCE PRODUCTS - WEIGHTED AVERAGE INTEREST RATE (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>9955549 - Disclosure - LIABILITIES FOR INSURANCE PRODUCTS - SUMMARY OF CHANGES IN POLICYHOLDER ACCOUNT BALANCES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/LIABILITIESFORINSURANCEPRODUCTSSUMMARYOFCHANGESINPOLICYHOLDERACCOUNTBALANCESDetails</Role>
      <ShortName>LIABILITIES FOR INSURANCE PRODUCTS - SUMMARY OF CHANGES IN POLICYHOLDER ACCOUNT BALANCES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>9955550 - Disclosure - LIABILITIES FOR INSURANCE PRODUCTS - GUARANTEED MINIMUM CREDITING RATES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/LIABILITIESFORINSURANCEPRODUCTSGUARANTEEDMINIMUMCREDITINGRATESDetails</Role>
      <ShortName>LIABILITIES FOR INSURANCE PRODUCTS - GUARANTEED MINIMUM CREDITING RATES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>9955551 - Disclosure - DEFERRED ACQUISITION COSTS, PRESENT VALUE OF FUTURE PROFITS AND SALES INDUCEMENTS - DEFERRED ACQUISITION COSTS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/DEFERREDACQUISITIONCOSTSPRESENTVALUEOFFUTUREPROFITSANDSALESINDUCEMENTSDEFERREDACQUISITIONCOSTSDetails</Role>
      <ShortName>DEFERRED ACQUISITION COSTS, PRESENT VALUE OF FUTURE PROFITS AND SALES INDUCEMENTS - DEFERRED ACQUISITION COSTS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>9955552 - Disclosure - DEFERRED ACQUISITION COSTS, PRESENT VALUE OF FUTURE PROFITS AND SALES INDUCEMENTS - PRESENT VALUE OF FUTURE PROFITS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/DEFERREDACQUISITIONCOSTSPRESENTVALUEOFFUTUREPROFITSANDSALESINDUCEMENTSPRESENTVALUEOFFUTUREPROFITSDetails</Role>
      <ShortName>DEFERRED ACQUISITION COSTS, PRESENT VALUE OF FUTURE PROFITS AND SALES INDUCEMENTS - PRESENT VALUE OF FUTURE PROFITS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>9955553 - Disclosure - DEFERRED ACQUISITION COSTS, PRESENT VALUE OF FUTURE PROFITS AND SALES INDUCEMENTS - SALES INDUCEMENTS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/DEFERREDACQUISITIONCOSTSPRESENTVALUEOFFUTUREPROFITSANDSALESINDUCEMENTSSALESINDUCEMENTSDetails</Role>
      <ShortName>DEFERRED ACQUISITION COSTS, PRESENT VALUE OF FUTURE PROFITS AND SALES INDUCEMENTS - SALES INDUCEMENTS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.cnoinc.com/role/DEFERREDACQUISITIONCOSTSPRESENTVALUEOFFUTUREPROFITSANDSALESINDUCEMENTSTables</ParentRole>
      <Position>67</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>9955554 - Disclosure - EARNINGS PER SHARE - BASIC AND DILUTED EARNINGS PER SHARE (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/EARNINGSPERSHAREBASICANDDILUTEDEARNINGSPERSHAREDetails</Role>
      <ShortName>EARNINGS PER SHARE - BASIC AND DILUTED EARNINGS PER SHARE (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>9955555 - Disclosure - BUSINESS SEGMENTS - NARRATIVE (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/BUSINESSSEGMENTSNARRATIVEDetails</Role>
      <ShortName>BUSINESS SEGMENTS - NARRATIVE (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>9955556 - Disclosure - BUSINESS SEGMENTS - SCHEDULE OF SEGMENT REPORTING INFORMATION BY SEGMENT (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/BUSINESSSEGMENTSSCHEDULEOFSEGMENTREPORTINGINFORMATIONBYSEGMENTDetails</Role>
      <ShortName>BUSINESS SEGMENTS - SCHEDULE OF SEGMENT REPORTING INFORMATION BY SEGMENT (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>9955557 - Disclosure - BUSINESS SEGMENTS - RECONCILIATION OF OPERATING PROFIT (LOSS) FROM SEGMENTS TO CONSOLIDATED (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/BUSINESSSEGMENTSRECONCILIATIONOFOPERATINGPROFITLOSSFROMSEGMENTSTOCONSOLIDATEDDetails</Role>
      <ShortName>BUSINESS SEGMENTS - RECONCILIATION OF OPERATING PROFIT (LOSS) FROM SEGMENTS TO CONSOLIDATED (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>9955558 - Disclosure - BUSINESS SEGMENTS - SCHEDULE OF BALANCE SHEET INFORMATION, BY SEGMENT (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/BUSINESSSEGMENTSSCHEDULEOFBALANCESHEETINFORMATIONBYSEGMENTDetails</Role>
      <ShortName>BUSINESS SEGMENTS - SCHEDULE OF BALANCE SHEET INFORMATION, BY SEGMENT (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>9955559 - Disclosure - DERIVATIVES - FAIR VALUE BY BALANCE SHEET LOCATION (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/DERIVATIVESFAIRVALUEBYBALANCESHEETLOCATIONDetails</Role>
      <ShortName>DERIVATIVES - FAIR VALUE BY BALANCE SHEET LOCATION (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>9955560 - Disclosure - DERIVATIVES - NARRATIVE (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/DERIVATIVESNARRATIVEDetails</Role>
      <ShortName>DERIVATIVES - NARRATIVE (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>9955561 - Disclosure - DERIVATIVES - SCHEDULE PRE-TAX GAINS (LOSSES) RECOGNIZED IN NET INCOME FOR DERIVATIVE INSTRUMENTS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/DERIVATIVESSCHEDULEPRETAXGAINSLOSSESRECOGNIZEDINNETINCOMEFORDERIVATIVEINSTRUMENTSDetails</Role>
      <ShortName>DERIVATIVES - SCHEDULE PRE-TAX GAINS (LOSSES) RECOGNIZED IN NET INCOME FOR DERIVATIVE INSTRUMENTS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>75</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>9955562 - Disclosure - DERIVATIVES - DERIVATIVES WITH MASTER NETTING ARRANGEMENTS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/DERIVATIVESDERIVATIVESWITHMASTERNETTINGARRANGEMENTSDetails</Role>
      <ShortName>DERIVATIVES - DERIVATIVES WITH MASTER NETTING ARRANGEMENTS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>76</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>9955563 - Disclosure - REINSURANCE (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/REINSURANCEDetails</Role>
      <ShortName>REINSURANCE (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.cnoinc.com/role/REINSURANCE</ParentRole>
      <Position>77</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>9955564 - Disclosure - INCOME TAXES - COMPONENTS OF TAX EXPENSE (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/INCOMETAXESCOMPONENTSOFTAXEXPENSEDetails</Role>
      <ShortName>INCOME TAXES - COMPONENTS OF TAX EXPENSE (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>78</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>9955565 - Disclosure - INCOME TAXES - RECONCILIATION OF CORPORATE TAX RATE (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/INCOMETAXESRECONCILIATIONOFCORPORATETAXRATEDetails</Role>
      <ShortName>INCOME TAXES - RECONCILIATION OF CORPORATE TAX RATE (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>79</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>9955566 - Disclosure - INCOME TAXES - DEFERRED ASSETS AND LIABILITIES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/INCOMETAXESDEFERREDASSETSANDLIABILITIESDetails</Role>
      <ShortName>INCOME TAXES - DEFERRED ASSETS AND LIABILITIES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>80</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>9955567 - Disclosure - INCOME TAXES - NARRATIVE (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/INCOMETAXESNARRATIVEDetails</Role>
      <ShortName>INCOME TAXES - NARRATIVE (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>81</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>9955568 - Disclosure - INCOME TAXES - NET OPERATING LOSSES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/INCOMETAXESNETOPERATINGLOSSESDetails</Role>
      <ShortName>INCOME TAXES - NET OPERATING LOSSES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>82</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>9955569 - Disclosure - NOTES PAYABLE - DIRECT CORPORATE OBLIGATIONS - SCHEDULE OF LONG-TERM DEBT INSTRUMENTS (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.cnoinc.com/role/NOTESPAYABLEDIRECTCORPORATEOBLIGATIONSSCHEDULEOFLONGTERMDEBTINSTRUMENTSDetails</Role>
      <ShortName>NOTES PAYABLE - DIRECT CORPORATE OBLIGATIONS - SCHEDULE OF LONG-TERM DEBT INSTRUMENTS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>83</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R84.htm</HtmlFileName>
      <LongName>9955570 - Disclosure - NOTES PAYABLE - DIRECT CORPORATE OBLIGATIONS - NARRATIVE (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.cnoinc.com/role/NOTESPAYABLEDIRECTCORPORATEOBLIGATIONSNARRATIVEDetails</Role>
      <ShortName>NOTES PAYABLE - DIRECT CORPORATE OBLIGATIONS - NARRATIVE (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>84</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R85.htm</HtmlFileName>
      <LongName>9955571 - Disclosure - INVESTMENT BORROWINGS - NARRATIVE (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/INVESTMENTBORROWINGSNARRATIVEDetails</Role>
      <ShortName>INVESTMENT BORROWINGS - NARRATIVE (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>85</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R86.htm</HtmlFileName>
      <LongName>9955572 - Disclosure - INVESTMENT BORROWINGS - TERMS OF THE BORROWINGS FROM THE FHLB (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/INVESTMENTBORROWINGSTERMSOFTHEBORROWINGSFROMTHEFHLBDetails</Role>
      <ShortName>INVESTMENT BORROWINGS - TERMS OF THE BORROWINGS FROM THE FHLB (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>86</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R87.htm</HtmlFileName>
      <LongName>9955573 - Disclosure - SHAREHOLDERS' EQUITY - NARRATIVE (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/SHAREHOLDERSEQUITYNARRATIVEDetails</Role>
      <ShortName>SHAREHOLDERS' EQUITY - NARRATIVE (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>87</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R88.htm</HtmlFileName>
      <LongName>9955574 - Disclosure - SHAREHOLDERS' EQUITY - SCHEDULE OF ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/SHAREHOLDERSEQUITYSCHEDULEOFACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSDetails</Role>
      <ShortName>SHAREHOLDERS' EQUITY - SCHEDULE OF ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>88</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R89.htm</HtmlFileName>
      <LongName>9955575 - Disclosure - LITIGATION AND OTHER LEGAL PROCEEDINGS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/LITIGATIONANDOTHERLEGALPROCEEDINGSDetails</Role>
      <ShortName>LITIGATION AND OTHER LEGAL PROCEEDINGS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.cnoinc.com/role/LITIGATIONANDOTHERLEGALPROCEEDINGS</ParentRole>
      <Position>89</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R90.htm</HtmlFileName>
      <LongName>9955576 - Disclosure - CONSOLIDATED STATEMENT OF CASH FLOWS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/CONSOLIDATEDSTATEMENTOFCASHFLOWSDetails</Role>
      <ShortName>CONSOLIDATED STATEMENT OF CASH FLOWS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.cnoinc.com/role/CONSOLIDATEDSTATEMENTOFCASHFLOWSTables</ParentRole>
      <Position>90</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R91.htm</HtmlFileName>
      <LongName>9955577 - Disclosure - INVESTMENTS IN VARIABLE INTEREST ENTITIES - BALANCE SHEET ITEMS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/INVESTMENTSINVARIABLEINTERESTENTITIESBALANCESHEETITEMSDetails</Role>
      <ShortName>INVESTMENTS IN VARIABLE INTEREST ENTITIES - BALANCE SHEET ITEMS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>91</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R92.htm</HtmlFileName>
      <LongName>9955578 - Disclosure - INVESTMENTS IN VARIABLE INTEREST ENTITIES - NARRATIVE (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/INVESTMENTSINVARIABLEINTERESTENTITIESNARRATIVEDetails</Role>
      <ShortName>INVESTMENTS IN VARIABLE INTEREST ENTITIES - NARRATIVE (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>92</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R93.htm</HtmlFileName>
      <LongName>9955579 - Disclosure - INVESTMENTS IN VARIABLE INTEREST ENTITIES - CHANGES IN ALLOWANCE (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/INVESTMENTSINVARIABLEINTERESTENTITIESCHANGESINALLOWANCEDetails</Role>
      <ShortName>INVESTMENTS IN VARIABLE INTEREST ENTITIES - CHANGES IN ALLOWANCE (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>93</Position>
    </Report>
    <Report instance="cno-20250630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R94.htm</HtmlFileName>
      <LongName>9955580 - Disclosure - INVESTMENTS IN VARIABLE INTEREST ENTITIES - SCHEDULE OF VIEs (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cnoinc.com/role/INVESTMENTSINVARIABLEINTERESTENTITIESSCHEDULEOFVIEsDetails</Role>
      <ShortName>INVESTMENTS IN VARIABLE INTEREST ENTITIES - SCHEDULE OF VIEs (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>94</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="10-Q" isDefinitelyFs="true" isUsgaap="true" original="cno-20250630.htm">cno-20250630.htm</File>
    <File>cno-20250630.xsd</File>
    <File>cno-20250630_cal.xml</File>
    <File>cno-20250630_def.xml</File>
    <File>cno-20250630_lab.xml</File>
    <File>cno-20250630_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="2469">http://fasb.org/us-gaap/2025</BaseTaxonomy>
    <BaseTaxonomy items="35">http://xbrl.sec.gov/dei/2025</BaseTaxonomy>
    <BaseTaxonomy items="32">http://xbrl.sec.gov/ecd/2025</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
