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Related Parties (Details) (FS&C [Member], USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Related Party Transaction [Line Items] |  |  |
Related Party Transaction Amount of Assets in Defined Contributions Plans |  | $ 22.8 kmpr_AmountsInvestedInDefinedContributionPlanMutualFundManagedByDirectorsInvestmentAdvisoryFirm | $ 20.4 kmpr_AmountsInvestedInDefinedContributionPlanMutualFundManagedByDirectorsInvestmentAdvisoryFirm
Related Party Transaction Percent of Assets in Defined Contribution Plan Assets |  | 6.00%kmpr_AmountsInvestedInDefinedContributionPlanMutualFundManagedByDirectorsInvestmentAdvisoryFirmPercentageOfTotalDefinedContributionPlanInvestments | 7.00%kmpr_AmountsInvestedInDefinedContributionPlanMutualFundManagedByDirectorsInvestmentAdvisoryFirmPercentageOfTotalDefinedContributionPlanInvestments
Trinity [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Amounts of Assets Managed by Investment Advisory Firm under Director's Management | 85.8 kmpr_InvestmentAssetsManagedByDirectorsInvestmentAdvisoryFirm / dei_LegalEntityAxis = kmpr_TrinityMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = kmpr_FSCMember | 154.7 kmpr_InvestmentAssetsManagedByDirectorsInvestmentAdvisoryFirm / dei_LegalEntityAxis = kmpr_TrinityMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = kmpr_FSCMember | 125.2 kmpr_InvestmentAssetsManagedByDirectorsInvestmentAdvisoryFirm / dei_LegalEntityAxis = kmpr_TrinityMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = kmpr_FSCMember
Reduction in Investment Assets Managed by a Directors Investment Advisory Firm | (80.0)kmpr_ReductioninInvestmentAssetsManagedbyaDirectorsInvestmentAdvisoryFirm / dei_LegalEntityAxis = kmpr_TrinityMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = kmpr_FSCMember |  |
Related Party Transaction, Expenses from Transactions with Related Party | 0.3 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / dei_LegalEntityAxis = kmpr_TrinityMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = kmpr_FSCMember | 0.4 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / dei_LegalEntityAxis = kmpr_TrinityMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = kmpr_FSCMember | 0.3 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / dei_LegalEntityAxis = kmpr_TrinityMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = kmpr_FSCMember
Pension Plans, Defined Benefit [Member] | Investment Management Services for Defined Benefit Plan [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Expenses from Transactions with Related Party | 0.4 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember / us-gaap_RelatedPartyTransactionAxis = kmpr_InvestmentManagementServicesforDefinedBenefitPlanMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = kmpr_FSCMember | 0.3 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember / us-gaap_RelatedPartyTransactionAxis = kmpr_InvestmentManagementServicesforDefinedBenefitPlanMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = kmpr_FSCMember | 0.3 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember / us-gaap_RelatedPartyTransactionAxis = kmpr_InvestmentManagementServicesforDefinedBenefitPlanMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = kmpr_FSCMember
Assets under Management, Carrying Amount | $ 159.2 us-gaap_AssetsUnderManagementCarryingAmount / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember / us-gaap_RelatedPartyTransactionAxis = kmpr_InvestmentManagementServicesforDefinedBenefitPlanMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = kmpr_FSCMember | $ 148.6 us-gaap_AssetsUnderManagementCarryingAmount / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember / us-gaap_RelatedPartyTransactionAxis = kmpr_InvestmentManagementServicesforDefinedBenefitPlanMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = kmpr_FSCMember | $ 120.7 us-gaap_AssetsUnderManagementCarryingAmount / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember / us-gaap_RelatedPartyTransactionAxis = kmpr_InvestmentManagementServicesforDefinedBenefitPlanMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = kmpr_FSCMember

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- Definition Amounts Invested in Defined Contribution Plan Mutual Fund Managed by a Director's Investment Advisory Firm + References No definition available. + Details
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- Definition Amounts Invested in Defined Contribution Plan Mutual Fund Managed by a Director's Investment Advisory Frim, Percentage of Total Defined Contribution Plan Investments + References No definition available. + Details
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- Definition Investment Assets Managed by a Directors Investment Advisory Firm + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Reduction in Investment Assets Managed by a Directors Investment Advisory Firm + References No definition available. + Details
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- Definition The carrying amount of assets an investment adviser manages on behalf of investors. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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- Details
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- Details
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- Details
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