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Debt - Interest Paid on Debt (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Debt Instrument [Line Items] |  |  |
Interest Paid | $ 45.7 us-gaap_InterestPaid | $ 37.7 us-gaap_InterestPaid | $ 39.3 us-gaap_InterestPaid
Senior Notes [Member] | Senior Notes, 6% Due November 30, 2015 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest Paid | 15.0 us-gaap_InterestPaid / us-gaap_DebtInstrumentAxis = kmpr_SeniorNotes6PercentDueNovember302015Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 15.0 us-gaap_InterestPaid / us-gaap_DebtInstrumentAxis = kmpr_SeniorNotes6PercentDueNovember302015Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 15.0 us-gaap_InterestPaid / us-gaap_DebtInstrumentAxis = kmpr_SeniorNotes6PercentDueNovember302015Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Senior Notes [Member] | Senior Notes, 6% Due May 15, 2017 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest Paid | 21.6 us-gaap_InterestPaid / us-gaap_DebtInstrumentAxis = kmpr_SeniorNotes6PercentDueMay152017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 21.6 us-gaap_InterestPaid / us-gaap_DebtInstrumentAxis = kmpr_SeniorNotes6PercentDueMay152017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 21.6 us-gaap_InterestPaid / us-gaap_DebtInstrumentAxis = kmpr_SeniorNotes6PercentDueMay152017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Subordinated Debt [Member] | Subordinated Debenture, 7.375 Percent Due 2054 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest Paid | 8.5 us-gaap_InterestPaid / us-gaap_DebtInstrumentAxis = kmpr_SubordinatedDebenture7.375PercentDue2054Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SubordinatedDebtMember | 0 us-gaap_InterestPaid / us-gaap_DebtInstrumentAxis = kmpr_SubordinatedDebenture7.375PercentDue2054Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SubordinatedDebtMember | 0 us-gaap_InterestPaid / us-gaap_DebtInstrumentAxis = kmpr_SubordinatedDebenture7.375PercentDue2054Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SubordinatedDebtMember
Mortgage Note Payable [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest Paid | 0 us-gaap_InterestPaid / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgageLoansOnRealEstateMember | 0.3 us-gaap_InterestPaid / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgageLoansOnRealEstateMember | 0.4 us-gaap_InterestPaid / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgageLoansOnRealEstateMember
Revolving Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest Paid | $ 0.6 us-gaap_InterestPaid / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember | $ 0.8 us-gaap_InterestPaid / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember | $ 2.3 us-gaap_InterestPaid / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember

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- Definition The amount of cash paid for interest during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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