<?xml version="1.0" encoding="utf-8"?>
<FilingSummary xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <Version>2.4.1.9</Version>
  <ProcessingTime />
  <ReportFormat>Html</ReportFormat>
  <ContextCount>507</ContextCount>
  <ElementCount>410</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>126</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>5</UnitCount>
  <MyReports>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>00090 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DocumentDocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
    </Report>
    <Report>
      <IsDefault>true</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>00100 - Statement - Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/StatementConsolidatedBalanceSheets</Role>
      <ShortName>Consolidated Balance Sheets</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>00105 - Statement - Consolidated Balance Sheets (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/StatementConsolidatedBalanceSheetsParenthetical</Role>
      <ShortName>Consolidated Balance Sheets (Parenthetical)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>00200 - Statement - Consolidated Statements of Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/StatementConsolidatedStatementsOfOperations</Role>
      <ShortName>Consolidated Statements of Operations</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>00300 - Statement - Consolidated Statements of Comprehensive Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/StatementConsolidatedStatementsOfComprehensiveIncome</Role>
      <ShortName>Consolidated Statements of Comprehensive Income</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>00305 - Statement - Consolidated Statements of Comprehensive Income (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/StatementConsolidatedStatementsOfComprehensiveIncomeParenthetical</Role>
      <ShortName>Consolidated Statements of Comprehensive Income (Parenthetical)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>00400 - Statement - Consolidated Statements of Changes in Stockholder's Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/StatementConsolidatedStatementsOfChangesInStockholderSEquity</Role>
      <ShortName>Consolidated Statements of Changes in Stockholder's Equity</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>00500 - Statement - Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/StatementConsolidatedStatementsOfCashFlows</Role>
      <ShortName>Consolidated Statements of Cash Flows</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>10101 - Disclosure - Nature of Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureNatureOfOperations</Role>
      <ShortName>Nature of Operations</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>10201 - Disclosure - Summary of Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureSummaryOfSignificantAccountingPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>10301 - Disclosure - Investments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureInvestments</Role>
      <ShortName>Investments</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>10401 - Disclosure - Fair Value Disclosures</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureFairValueDisclosures</Role>
      <ShortName>Fair Value Disclosures</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>10501 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureIncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>10601 - Disclosure - Premiums and Accounts Receivable</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosurePremiumsAndAccountsReceivable</Role>
      <ShortName>Premiums and Accounts Receivable</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>10701 - Disclosure - Stockholder's Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureStockholderSEquity</Role>
      <ShortName>Stockholder's Equity</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>10801 - Disclosure - Statutory Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureStatutoryInformation</Role>
      <ShortName>Statutory Information</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>10901 - Disclosure - Reinsurance</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureReinsurance</Role>
      <ShortName>Reinsurance</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>11001 - Disclosure - Reserves</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureReserves</Role>
      <ShortName>Reserves</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>11101 - Disclosure - Retirement and Other Employee Benefits</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureRetirementAndOtherEmployeeBenefits</Role>
      <ShortName>Retirement and Other Employee Benefits</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>11201 - Disclosure - Deferred Acquisition Costs</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureDeferredAcquisitionCosts</Role>
      <ShortName>Deferred Acquisition Costs</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>11301 - Disclosure - Goodwill, VOBA and Other Intangible Assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureGoodwillVobaAndOtherIntangibleAssets</Role>
      <ShortName>Goodwill, VOBA and Other Intangible Assets</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>11401 - Disclosure - Accumulated Other Comprehensive Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureAccumulatedOtherComprehensiveIncome</Role>
      <ShortName>Accumulated Other Comprehensive Income</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>11501 - Disclosure - Related Party Transactions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureRelatedPartyTransactions</Role>
      <ShortName>Related Party Transactions</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>11601 - Disclosure - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureCommitmentsAndContingencies</Role>
      <ShortName>Commitments and Contingencies</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>11701 - Disclosure - Schedule I-Summary of Investments Other-Than-Investments in Related Parties</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureScheduleISummaryOfInvestmentsOtherThanInvestmentsInRelatedParties</Role>
      <ShortName>Schedule I-Summary of Investments Other-Than-Investments in Related Parties</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>11801 - Disclosure - Schedule III-Supplementary Insurance Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureScheduleIiiSupplementaryInsuranceInformation</Role>
      <ShortName>Schedule III-Supplementary Insurance Information</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>11901 - Disclosure - Schedule IV - Reinsurance</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureScheduleIvReinsurance</Role>
      <ShortName>Schedule IV - Reinsurance</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>12001 - Disclosure - Schedule V-Valuation and Qualifying Accounts</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureScheduleVValuationAndQualifyingAccounts</Role>
      <ShortName>Schedule V-Valuation and Qualifying Accounts</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>20202 - Disclosure - Summary of Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies (Policies)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>30303 - Disclosure - Investments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureInvestmentsTables</Role>
      <ShortName>Investments (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>30403 - Disclosure - Fair Value Disclosures (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureFairValueDisclosuresTables</Role>
      <ShortName>Fair Value Disclosures (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>30503 - Disclosure - Income Taxes (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureIncomeTaxesTables</Role>
      <ShortName>Income Taxes (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>30603 - Disclosure - Premiums and Accounts Receivable (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosurePremiumsAndAccountsReceivableTables</Role>
      <ShortName>Premiums and Accounts Receivable (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>30803 - Disclosure - Statutory Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureStatutoryInformationTables</Role>
      <ShortName>Statutory Information (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>30903 - Disclosure - Reinsurance (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureReinsuranceTables</Role>
      <ShortName>Reinsurance (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>31003 - Disclosure - Reserves (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureReservesTables</Role>
      <ShortName>Reserves (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>31203 - Disclosure - Deferred Acquisition Costs (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureDeferredAcquisitionCostsTables</Role>
      <ShortName>Deferred Acquisition Costs (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>31303 - Disclosure - Goodwill, VOBA and Other Intangible Assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureGoodwillVobaAndOtherIntangibleAssetsTables</Role>
      <ShortName>Goodwill, VOBA and Other Intangible Assets (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>31403 - Disclosure - Accumulated Other Comprehensive Income (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureAccumulatedOtherComprehensiveIncomeTables</Role>
      <ShortName>Accumulated Other Comprehensive Income (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>31603 - Disclosure - Commitments and Contingencies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureCommitmentsAndContingenciesTables</Role>
      <ShortName>Commitments and Contingencies (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>40101 - Disclosure - Nature of Operations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureNatureOfOperationsDetails</Role>
      <ShortName>Nature of Operations (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>40201 - Disclosure - Summary of Significant Accounting Policies (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureSummaryOfSignificantAccountingPoliciesDetails</Role>
      <ShortName>Summary of Significant Accounting Policies (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>40202 - Disclosure - Summary of Significant Accounting Policies (Details 2)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureSummaryOfSignificantAccountingPoliciesDetails2</Role>
      <ShortName>Summary of Significant Accounting Policies (Details 2)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>40301 - Disclosure - Investments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureInvestmentsDetails</Role>
      <ShortName>Investments (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>40302 - Disclosure - Investments (Details 2)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureInvestmentsDetails2</Role>
      <ShortName>Investments (Details 2)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>40303 - Disclosure - Investments (Details 3)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureInvestmentsDetails3</Role>
      <ShortName>Investments (Details 3)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>40304 - Disclosure - Investments (Details 4)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureInvestmentsDetails4</Role>
      <ShortName>Investments (Details 4)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>40305 - Disclosure - Investments (Details 5)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureInvestmentsDetails5</Role>
      <ShortName>Investments (Details 5)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>40306 - Disclosure - Investments (Details 6)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureInvestmentsDetails6</Role>
      <ShortName>Investments (Details 6)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>40307 - Disclosure - Investments (Details 7)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureInvestmentsDetails7</Role>
      <ShortName>Investments (Details 7)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>40308 - Disclosure - Investments (Details 8)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureInvestmentsDetails8</Role>
      <ShortName>Investments (Details 8)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>40309 - Disclosure - Investments (Details 9)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureInvestmentsDetails9</Role>
      <ShortName>Investments (Details 9)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>40310 - Disclosure - Investments (Details 10)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureInvestmentsDetails10</Role>
      <ShortName>Investments (Details 10)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>40401 - Disclosure - Investments (Details 11)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureInvestmentsDetails11</Role>
      <ShortName>Investments (Details 11)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>40402 - Disclosure - Fair Value Disclosures (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureFairValueDisclosuresDetails</Role>
      <ShortName>Fair Value Disclosures (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>40403 - Disclosure - Fair Value Disclosures (Details 2)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureFairValueDisclosuresDetails2</Role>
      <ShortName>Fair Value Disclosures (Details 2)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>40404 - Disclosure - Fair Value Disclosures (Details 3)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureFairValueDisclosuresDetails3</Role>
      <ShortName>Fair Value Disclosures (Details 3)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>40405 - Disclosure - Fair Value Disclosures (Details 4)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureFairValueDisclosuresDetails4</Role>
      <ShortName>Fair Value Disclosures (Details 4)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>40501 - Disclosure - Income Taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureIncomeTaxesDetails</Role>
      <ShortName>Income Taxes (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>40502 - Disclosure - Income Taxes (Details 2)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureIncomeTaxesDetails2</Role>
      <ShortName>Income Taxes (Details 2)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>40503 - Disclosure - Income Taxes (Details 3)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureIncomeTaxesDetails3</Role>
      <ShortName>Income Taxes (Details 3)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>40601 - Disclosure - Premiums and Accounts Receivable (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosurePremiumsAndAccountsReceivableDetails</Role>
      <ShortName>Premiums and Accounts Receivable (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>40701 - Disclosure - Stockholder's Equity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureStockholderSEquityDetails</Role>
      <ShortName>Stockholder's Equity (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>40801 - Disclosure - Statutory Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureStatutoryInformationDetails</Role>
      <ShortName>Statutory Information (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>40901 - Disclosure - Reinsurance (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureReinsuranceDetails</Role>
      <ShortName>Reinsurance (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>40902 - Disclosure - Reinsurance (Details 2)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureReinsuranceDetails2</Role>
      <ShortName>Reinsurance (Details 2)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>40903 - Disclosure - Reinsurance (Details 3)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureReinsuranceDetails3</Role>
      <ShortName>Reinsurance (Details 3)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>41001 - Disclosure - Reserves (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureReservesDetails</Role>
      <ShortName>Reserves (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>41002 - Disclosure - Reserves (Details 2)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureReservesDetails2</Role>
      <ShortName>Reserves (Details 2)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>41003 - Disclosure - Reserves (Details 3)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureReservesDetails3</Role>
      <ShortName>Reserves (Details 3)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>41101 - Disclosure - Retirement and Other Employee Benefits (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureRetirementAndOtherEmployeeBenefitsDetails</Role>
      <ShortName>Retirement and Other Employee Benefits (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>41201 - Disclosure - Deferred Acquisition Costs (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureDeferredAcquisitionCostsDetails</Role>
      <ShortName>Deferred Acquisition Costs (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>41301 - Disclosure - Goodwill, VOBA and Other Intangible Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureGoodwillVobaAndOtherIntangibleAssetsDetails</Role>
      <ShortName>Goodwill, VOBA and Other Intangible Assets (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>41302 - Disclosure - Goodwill, VOBA and Other Intangible Assets (Details 2)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureGoodwillVobaAndOtherIntangibleAssetsDetails2</Role>
      <ShortName>Goodwill, VOBA and Other Intangible Assets (Details 2)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>41303 - Disclosure - Goodwill, VOBA and Other Intangible Assets (Details 3)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureGoodwillVobaAndOtherIntangibleAssetsDetails3</Role>
      <ShortName>Goodwill, VOBA and Other Intangible Assets (Details 3)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>41304 - Disclosure - Goodwill, VOBA and Other Intangible Assets (Details 4)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureGoodwillVobaAndOtherIntangibleAssetsDetails4</Role>
      <ShortName>Goodwill, VOBA and Other Intangible Assets (Details 4)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>41401 - Disclosure - Accumulated Other Comprehensive Income (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureAccumulatedOtherComprehensiveIncomeDetails</Role>
      <ShortName>Accumulated Other Comprehensive Income (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>41402 - Disclosure - Accumulated Other Comprehensive Income (Details 2)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureAccumulatedOtherComprehensiveIncomeDetails2</Role>
      <ShortName>Accumulated Other Comprehensive Income (Details 2)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>41501 - Disclosure - Related Party Transactions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureRelatedPartyTransactionsDetails</Role>
      <ShortName>Related Party Transactions (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>41601 - Disclosure - Commitments and Contingencies (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureCommitmentsAndContingenciesDetails</Role>
      <ShortName>Commitments and Contingencies (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>41701 - Disclosure - Schedule I-Summary of Investments Other-Than-Investments in Related Parties (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureScheduleISummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesDetails</Role>
      <ShortName>Schedule I-Summary of Investments Other-Than-Investments in Related Parties (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>41801 - Disclosure - Schedule III-Supplementary Insurance Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureScheduleIiiSupplementaryInsuranceInformationDetails</Role>
      <ShortName>Schedule III-Supplementary Insurance Information (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>41901 - Disclosure - Schedule IV - Reinsurance (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureScheduleIvReinsuranceDetails</Role>
      <ShortName>Schedule IV - Reinsurance (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R84.htm</HtmlFileName>
      <LongName>42001 - Disclosure - Schedule V-Valuation and Qualifying Accounts (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.assurant.com/role/DisclosureScheduleVValuationAndQualifyingAccountsDetails</Role>
      <ShortName>Schedule V-Valuation and Qualifying Accounts (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <Logs>
    <Log type="Info">Element us-gaap_ConcentrationRiskPercentage1 had a mix of decimals attribute values: 2 3.</Log>
    <Log type="Info">Process Flow-Through: 00100 - Statement - Consolidated Balance Sheets</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Dec. 31, 2012'</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Dec. 31, 2011'</Log>
    <Log type="Info">Process Flow-Through: 00105 - Statement - Consolidated Balance Sheets (Parenthetical)</Log>
    <Log type="Info">Process Flow-Through: 00200 - Statement - Consolidated Statements of Operations</Log>
    <Log type="Info">Process Flow-Through: 00300 - Statement - Consolidated Statements of Comprehensive Income</Log>
    <Log type="Info">Process Flow-Through: 00305 - Statement - Consolidated Statements of Comprehensive Income (Parenthetical)</Log>
    <Log type="Info">Process Flow-Through: 00500 - Statement - Consolidated Statements of Cash Flows</Log>
  </Logs>
  <InputFiles>
    <File>usic-20141231.xml</File>
    <File>usic-20141231.xsd</File>
    <File>usic-20141231_cal.xml</File>
    <File>usic-20141231_def.xml</File>
    <File>usic-20141231_lab.xml</File>
    <File>usic-20141231_pre.xml</File>
  </InputFiles>
  <SupplementalFiles />
  <BaseTaxonomies />
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
