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Schedule 3 - Supplementary Insurance Information (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Supplementary Insurance Information, by Segment [Line Items] |  |  |  |  |  |
Premiums | $ 1,862.2 us-gaap_SupplementaryInsuranceInformationPremiumRevenue |  | $ 2,025.8 us-gaap_SupplementaryInsuranceInformationPremiumRevenue |  | $ 2,107.1 us-gaap_SupplementaryInsuranceInformationPremiumRevenue |
Other Income | 1.4 kmpr_SupplementaryInsuranceInformationOtherIncome |  | 0.8 kmpr_SupplementaryInsuranceInformationOtherIncome |  | 0.8 kmpr_SupplementaryInsuranceInformationOtherIncome |
Net Investment Income | 309.1 us-gaap_SupplementaryInsuranceInformationNetInvestmentIncome |  | 314.7 us-gaap_SupplementaryInsuranceInformationNetInvestmentIncome |  | 295.9 us-gaap_SupplementaryInsuranceInformationNetInvestmentIncome |
Insurance Claims and Policyholders' Benefits | 1,261.7 us-gaap_SupplementaryInsuranceInformationBenefitsClaimsLossesAndSettlementExpense |  | 1,357.2 us-gaap_SupplementaryInsuranceInformationBenefitsClaimsLossesAndSettlementExpense |  | 1,582.0 us-gaap_SupplementaryInsuranceInformationBenefitsClaimsLossesAndSettlementExpense |
Amortization of Deferred Policy Acquisition Costs | 235.4 us-gaap_SupplementaryInsuranceInformationAmortizationOfDeferredPolicyAcquisitionCosts |  | 253.9 us-gaap_SupplementaryInsuranceInformationAmortizationOfDeferredPolicyAcquisitionCosts |  | 257.0 us-gaap_SupplementaryInsuranceInformationAmortizationOfDeferredPolicyAcquisitionCosts |
Other Insurance Expenses | 393.0 us-gaap_SupplementaryInsuranceInformationOtherOperatingExpense |  | 400.5 us-gaap_SupplementaryInsuranceInformationOtherOperatingExpense |  | 415.3 us-gaap_SupplementaryInsuranceInformationOtherOperatingExpense |
Deferred Policy Acquisition Costs | 303.3 us-gaap_SupplementaryInsuranceInformationDeferredPolicyAcquisitionCosts |  | 302.9 us-gaap_SupplementaryInsuranceInformationDeferredPolicyAcquisitionCosts |  |  |
Insurance Reserves | 4,007.6 us-gaap_SupplementaryInsuranceInformationLiabilityForFuturePolicyBenefitsLossesClaimsAndLossExpenseReserves |  | 4,061.0 us-gaap_SupplementaryInsuranceInformationLiabilityForFuturePolicyBenefitsLossesClaimsAndLossExpenseReserves |  |  |
Unearned Premiums | 536.9 us-gaap_SupplementaryInsuranceInformationUnearnedPremiums |  | 598.9 us-gaap_SupplementaryInsuranceInformationUnearnedPremiums |  |  |
Property and Casualty Insurance [Member] |  |  |  |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |  |  |  |
Premiums | 1,249.5 us-gaap_SupplementaryInsuranceInformationPremiumRevenue / us-gaap_StatementBusinessSegmentsAxis = kmpr_PropertyAndCasualtyInsuranceMember |  | 1,392.9 us-gaap_SupplementaryInsuranceInformationPremiumRevenue / us-gaap_StatementBusinessSegmentsAxis = kmpr_PropertyAndCasualtyInsuranceMember |  | 1,467.2 us-gaap_SupplementaryInsuranceInformationPremiumRevenue / us-gaap_StatementBusinessSegmentsAxis = kmpr_PropertyAndCasualtyInsuranceMember |
Premiums Written | 1,189.1 us-gaap_SupplementaryInsuranceInformationPremiumsWritten / us-gaap_StatementBusinessSegmentsAxis = kmpr_PropertyAndCasualtyInsuranceMember |  | 1,342.2 us-gaap_SupplementaryInsuranceInformationPremiumsWritten / us-gaap_StatementBusinessSegmentsAxis = kmpr_PropertyAndCasualtyInsuranceMember |  | 1,454.1 us-gaap_SupplementaryInsuranceInformationPremiumsWritten / us-gaap_StatementBusinessSegmentsAxis = kmpr_PropertyAndCasualtyInsuranceMember |
Other Income | 0.5 kmpr_SupplementaryInsuranceInformationOtherIncome / us-gaap_StatementBusinessSegmentsAxis = kmpr_PropertyAndCasualtyInsuranceMember |  | 0.5 kmpr_SupplementaryInsuranceInformationOtherIncome / us-gaap_StatementBusinessSegmentsAxis = kmpr_PropertyAndCasualtyInsuranceMember |  | 0.7 kmpr_SupplementaryInsuranceInformationOtherIncome / us-gaap_StatementBusinessSegmentsAxis = kmpr_PropertyAndCasualtyInsuranceMember |
Net Investment Income | 72.7 us-gaap_SupplementaryInsuranceInformationNetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = kmpr_PropertyAndCasualtyInsuranceMember |  | 90.9 us-gaap_SupplementaryInsuranceInformationNetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = kmpr_PropertyAndCasualtyInsuranceMember |  | 77.9 us-gaap_SupplementaryInsuranceInformationNetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = kmpr_PropertyAndCasualtyInsuranceMember |
Insurance Claims and Policyholders' Benefits | 887.3 us-gaap_SupplementaryInsuranceInformationBenefitsClaimsLossesAndSettlementExpense / us-gaap_StatementBusinessSegmentsAxis = kmpr_PropertyAndCasualtyInsuranceMember |  | 969.3 us-gaap_SupplementaryInsuranceInformationBenefitsClaimsLossesAndSettlementExpense / us-gaap_StatementBusinessSegmentsAxis = kmpr_PropertyAndCasualtyInsuranceMember |  | 1,188.9 us-gaap_SupplementaryInsuranceInformationBenefitsClaimsLossesAndSettlementExpense / us-gaap_StatementBusinessSegmentsAxis = kmpr_PropertyAndCasualtyInsuranceMember |
Amortization of Deferred Policy Acquisition Costs | 187.5 us-gaap_SupplementaryInsuranceInformationAmortizationOfDeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = kmpr_PropertyAndCasualtyInsuranceMember |  | 207.2 us-gaap_SupplementaryInsuranceInformationAmortizationOfDeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = kmpr_PropertyAndCasualtyInsuranceMember |  | 212.6 us-gaap_SupplementaryInsuranceInformationAmortizationOfDeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = kmpr_PropertyAndCasualtyInsuranceMember |
Other Insurance Expenses | 166.2 us-gaap_SupplementaryInsuranceInformationOtherOperatingExpense / us-gaap_StatementBusinessSegmentsAxis = kmpr_PropertyAndCasualtyInsuranceMember |  | 168.2 us-gaap_SupplementaryInsuranceInformationOtherOperatingExpense / us-gaap_StatementBusinessSegmentsAxis = kmpr_PropertyAndCasualtyInsuranceMember |  | 179.9 us-gaap_SupplementaryInsuranceInformationOtherOperatingExpense / us-gaap_StatementBusinessSegmentsAxis = kmpr_PropertyAndCasualtyInsuranceMember |
Deferred Policy Acquisition Costs | 78.2 us-gaap_SupplementaryInsuranceInformationDeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = kmpr_PropertyAndCasualtyInsuranceMember |  | 85.7 us-gaap_SupplementaryInsuranceInformationDeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = kmpr_PropertyAndCasualtyInsuranceMember |  |  |
Insurance Reserves | 651.1 us-gaap_SupplementaryInsuranceInformationLiabilityForFuturePolicyBenefitsLossesClaimsAndLossExpenseReserves / us-gaap_StatementBusinessSegmentsAxis = kmpr_PropertyAndCasualtyInsuranceMember |  | 742.6 us-gaap_SupplementaryInsuranceInformationLiabilityForFuturePolicyBenefitsLossesClaimsAndLossExpenseReserves / us-gaap_StatementBusinessSegmentsAxis = kmpr_PropertyAndCasualtyInsuranceMember |  |  |
Unearned Premiums | 509.7 us-gaap_SupplementaryInsuranceInformationUnearnedPremiums / us-gaap_StatementBusinessSegmentsAxis = kmpr_PropertyAndCasualtyInsuranceMember |  | 570.3 us-gaap_SupplementaryInsuranceInformationUnearnedPremiums / us-gaap_StatementBusinessSegmentsAxis = kmpr_PropertyAndCasualtyInsuranceMember |  |  |
Life and Health Insurance [Member] |  |  |  |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |  |  |  |
Premiums | 612.7 us-gaap_SupplementaryInsuranceInformationPremiumRevenue / us-gaap_StatementBusinessSegmentsAxis = kmpr_LifeAndHealthInsuranceMember | [1] | 632.9 us-gaap_SupplementaryInsuranceInformationPremiumRevenue / us-gaap_StatementBusinessSegmentsAxis = kmpr_LifeAndHealthInsuranceMember | [1] | 639.9 us-gaap_SupplementaryInsuranceInformationPremiumRevenue / us-gaap_StatementBusinessSegmentsAxis = kmpr_LifeAndHealthInsuranceMember | [1]
Other Income | 0.9 kmpr_SupplementaryInsuranceInformationOtherIncome / us-gaap_StatementBusinessSegmentsAxis = kmpr_LifeAndHealthInsuranceMember | [1] | 0.2 kmpr_SupplementaryInsuranceInformationOtherIncome / us-gaap_StatementBusinessSegmentsAxis = kmpr_LifeAndHealthInsuranceMember | [1] | 0.1 kmpr_SupplementaryInsuranceInformationOtherIncome / us-gaap_StatementBusinessSegmentsAxis = kmpr_LifeAndHealthInsuranceMember | [1]
Net Investment Income | 218.7 us-gaap_SupplementaryInsuranceInformationNetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = kmpr_LifeAndHealthInsuranceMember | [1] | 209.9 us-gaap_SupplementaryInsuranceInformationNetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = kmpr_LifeAndHealthInsuranceMember | [1] | 204.3 us-gaap_SupplementaryInsuranceInformationNetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = kmpr_LifeAndHealthInsuranceMember | [1]
Insurance Claims and Policyholders' Benefits | 374.4 us-gaap_SupplementaryInsuranceInformationBenefitsClaimsLossesAndSettlementExpense / us-gaap_StatementBusinessSegmentsAxis = kmpr_LifeAndHealthInsuranceMember | [1] | 387.9 us-gaap_SupplementaryInsuranceInformationBenefitsClaimsLossesAndSettlementExpense / us-gaap_StatementBusinessSegmentsAxis = kmpr_LifeAndHealthInsuranceMember | [1] | 393.1 us-gaap_SupplementaryInsuranceInformationBenefitsClaimsLossesAndSettlementExpense / us-gaap_StatementBusinessSegmentsAxis = kmpr_LifeAndHealthInsuranceMember | [1]
Amortization of Deferred Policy Acquisition Costs | 47.9 us-gaap_SupplementaryInsuranceInformationAmortizationOfDeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = kmpr_LifeAndHealthInsuranceMember | [1] | 46.7 us-gaap_SupplementaryInsuranceInformationAmortizationOfDeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = kmpr_LifeAndHealthInsuranceMember | [1] | 44.4 us-gaap_SupplementaryInsuranceInformationAmortizationOfDeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = kmpr_LifeAndHealthInsuranceMember | [1]
Other Insurance Expenses | 268.1 us-gaap_SupplementaryInsuranceInformationOtherOperatingExpense / us-gaap_StatementBusinessSegmentsAxis = kmpr_LifeAndHealthInsuranceMember | [1] | 271.5 us-gaap_SupplementaryInsuranceInformationOtherOperatingExpense / us-gaap_StatementBusinessSegmentsAxis = kmpr_LifeAndHealthInsuranceMember | [1] | 266.4 us-gaap_SupplementaryInsuranceInformationOtherOperatingExpense / us-gaap_StatementBusinessSegmentsAxis = kmpr_LifeAndHealthInsuranceMember | [1]
Deferred Policy Acquisition Costs | 225.1 us-gaap_SupplementaryInsuranceInformationDeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = kmpr_LifeAndHealthInsuranceMember | [1] | 217.2 us-gaap_SupplementaryInsuranceInformationDeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = kmpr_LifeAndHealthInsuranceMember | [1] |  |
Insurance Reserves | 3,278.2 us-gaap_SupplementaryInsuranceInformationLiabilityForFuturePolicyBenefitsLossesClaimsAndLossExpenseReserves / us-gaap_StatementBusinessSegmentsAxis = kmpr_LifeAndHealthInsuranceMember | [1] | 3,222.8 us-gaap_SupplementaryInsuranceInformationLiabilityForFuturePolicyBenefitsLossesClaimsAndLossExpenseReserves / us-gaap_StatementBusinessSegmentsAxis = kmpr_LifeAndHealthInsuranceMember | [1] |  |
Unearned Premiums | 27.2 us-gaap_SupplementaryInsuranceInformationUnearnedPremiums / us-gaap_StatementBusinessSegmentsAxis = kmpr_LifeAndHealthInsuranceMember | [1] | 28.6 us-gaap_SupplementaryInsuranceInformationUnearnedPremiums / us-gaap_StatementBusinessSegmentsAxis = kmpr_LifeAndHealthInsuranceMember | [1] |  |
Other Segments [Member] |  |  |  |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |  |  |  |
Premiums | 0 us-gaap_SupplementaryInsuranceInformationPremiumRevenue / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  | 0 us-gaap_SupplementaryInsuranceInformationPremiumRevenue / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  | 0 us-gaap_SupplementaryInsuranceInformationPremiumRevenue / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Other Income | 0 kmpr_SupplementaryInsuranceInformationOtherIncome / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  | 0.1 kmpr_SupplementaryInsuranceInformationOtherIncome / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  | 0 kmpr_SupplementaryInsuranceInformationOtherIncome / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Net Investment Income | 17.7 us-gaap_SupplementaryInsuranceInformationNetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  | 13.9 us-gaap_SupplementaryInsuranceInformationNetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  | 13.7 us-gaap_SupplementaryInsuranceInformationNetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Insurance Claims and Policyholders' Benefits | 0 us-gaap_SupplementaryInsuranceInformationBenefitsClaimsLossesAndSettlementExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  | 0 us-gaap_SupplementaryInsuranceInformationBenefitsClaimsLossesAndSettlementExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  | 0 us-gaap_SupplementaryInsuranceInformationBenefitsClaimsLossesAndSettlementExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Amortization of Deferred Policy Acquisition Costs | 0 us-gaap_SupplementaryInsuranceInformationAmortizationOfDeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  | 0 us-gaap_SupplementaryInsuranceInformationAmortizationOfDeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  | 0 us-gaap_SupplementaryInsuranceInformationAmortizationOfDeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Other Insurance Expenses | (41.3)us-gaap_SupplementaryInsuranceInformationOtherOperatingExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  | (39.2)us-gaap_SupplementaryInsuranceInformationOtherOperatingExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  | (31.0)us-gaap_SupplementaryInsuranceInformationOtherOperatingExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Deferred Policy Acquisition Costs | 0 us-gaap_SupplementaryInsuranceInformationDeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  | 0 us-gaap_SupplementaryInsuranceInformationDeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  |  |
Insurance Reserves | 78.3 us-gaap_SupplementaryInsuranceInformationLiabilityForFuturePolicyBenefitsLossesClaimsAndLossExpenseReserves / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  | 95.6 us-gaap_SupplementaryInsuranceInformationLiabilityForFuturePolicyBenefitsLossesClaimsAndLossExpenseReserves / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  |  |
Unearned Premiums | $ 0 us-gaap_SupplementaryInsuranceInformationUnearnedPremiums / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  | $ 0 us-gaap_SupplementaryInsuranceInformationUnearnedPremiums / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  |  |
[1] | The Company’s Life & Health Insurance employee-agents also market certain property and casualty insurance products under common management. Accordingly, the Company includes the results of these property and casualty insurance products in its Life & Health Insurance segment.

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- Definition Amount of amortization of deferred policy acquisition costs recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915 + Details
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- Definition Amount of insurance benefits, claims, losses and settlement expenses incurred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915 + Details
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- Definition Net amount of deferred policy acquisition costs capitalized on contracts remaining in force on the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915 + Details
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- Definition Amount of reserves for future policy claims payable and loss expenses to be incurred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915 + Details
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- Definition Amount of net investment income earned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915 + Details
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- Definition Amount of premium revenue earned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915 + Details
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