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Income Taxes - Summary of Federal Net Operating Loss Carryforwards and Related Deferred Income Tax Assets (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Income Tax Contingency [Line Items] |  |
Deferred Tax Asset | $ 31.7 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | $ 53.3 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Internal Revenue Service (IRS) [Member] |  |
Income Tax Contingency [Line Items] |  |
NOL Carry-forwards | 90.5 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember |
Deferred Tax Asset | 31.7 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember |
Internal Revenue Service (IRS) [Member] | 2020 [Member] |  |
Income Tax Contingency [Line Items] |  |
NOL Carry-forwards | 8.1 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember / kmpr_OperatingLossCarryforwardsExpirationDatesAxis = kmpr_A2017Through2020Member |
Deferred Tax Asset | 2.8 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember / kmpr_OperatingLossCarryforwardsExpirationDatesAxis = kmpr_A2017Through2020Member |
Internal Revenue Service (IRS) [Member] | 2021 through 2025 [Member] |  |
Income Tax Contingency [Line Items] |  |
NOL Carry-forwards | 30.6 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember / kmpr_OperatingLossCarryforwardsExpirationDatesAxis = kmpr_A2021Through2025Member |
Deferred Tax Asset | 10.8 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember / kmpr_OperatingLossCarryforwardsExpirationDatesAxis = kmpr_A2021Through2025Member |
Internal Revenue Service (IRS) [Member] | 2026 through 2030 [Member] |  |
Income Tax Contingency [Line Items] |  |
NOL Carry-forwards | 29.8 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember / kmpr_OperatingLossCarryforwardsExpirationDatesAxis = kmpr_A2026Through2030Member |
Deferred Tax Asset | 10.4 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember / kmpr_OperatingLossCarryforwardsExpirationDatesAxis = kmpr_A2026Through2030Member |
Internal Revenue Service (IRS) [Member] | 2031 through 2032 [Member] |  |
Income Tax Contingency [Line Items] |  |
NOL Carry-forwards | 22.0 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember / kmpr_OperatingLossCarryforwardsExpirationDatesAxis = kmpr_A2031Through2032Member |
Deferred Tax Asset | $ 7.7 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember / kmpr_OperatingLossCarryforwardsExpirationDatesAxis = kmpr_A2031Through2032Member |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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