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Debt - Interest Expense 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 Costs Incurred | $ 47.9 us-gaap_InterestCostsIncurred | $ 39.2 us-gaap_InterestCostsIncurred | $ 39.8 us-gaap_InterestCostsIncurred
Capitalization of Interest | (1.0)us-gaap_InterestCostsIncurredCapitalized | (0.9)us-gaap_InterestCostsIncurredCapitalized | (1.8)us-gaap_InterestCostsIncurredCapitalized
Total Interest Expense | 46.9 us-gaap_InterestExpenseDebt | 38.3 us-gaap_InterestExpenseDebt | 38.0 us-gaap_InterestExpenseDebt
Senior Notes [Member] | Senior Notes, 6% Due November 30, 2015 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest Costs Incurred | 15.5 us-gaap_InterestCostsIncurred / us-gaap_DebtInstrumentAxis = kmpr_SeniorNotes6PercentDueNovember302015Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 15.4 us-gaap_InterestCostsIncurred / us-gaap_DebtInstrumentAxis = kmpr_SeniorNotes6PercentDueNovember302015Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 15.4 us-gaap_InterestCostsIncurred / 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 Costs Incurred | 22.2 us-gaap_InterestCostsIncurred / us-gaap_DebtInstrumentAxis = kmpr_SeniorNotes6PercentDueMay152017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 22.2 us-gaap_InterestCostsIncurred / us-gaap_DebtInstrumentAxis = kmpr_SeniorNotes6PercentDueMay152017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 22.1 us-gaap_InterestCostsIncurred / 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 Costs Incurred | 9.4 us-gaap_InterestCostsIncurred / us-gaap_DebtInstrumentAxis = kmpr_SubordinatedDebenture7.375PercentDue2054Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SubordinatedDebtMember | 0 us-gaap_InterestCostsIncurred / us-gaap_DebtInstrumentAxis = kmpr_SubordinatedDebenture7.375PercentDue2054Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SubordinatedDebtMember | 0 us-gaap_InterestCostsIncurred / us-gaap_DebtInstrumentAxis = kmpr_SubordinatedDebenture7.375PercentDue2054Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SubordinatedDebtMember
Mortgage Note Payable [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest Costs Incurred | 0 us-gaap_InterestCostsIncurred / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgageLoansOnRealEstateMember | 0.2 us-gaap_InterestCostsIncurred / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgageLoansOnRealEstateMember | 0.4 us-gaap_InterestCostsIncurred / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgageLoansOnRealEstateMember
Revolving Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest Costs Incurred | $ 0.8 us-gaap_InterestCostsIncurred / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember | $ 1.4 us-gaap_InterestCostsIncurred / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember | $ 1.9 us-gaap_InterestCostsIncurred / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember

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- Definition Total interest costs incurred during the period and either capitalized or charged against earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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- Definition Amount of interest capitalized, including amount of allowance for funds used during construction. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Allowance for Funds Used during Construction -URI http://asc.fasb.org/extlink&oid=6504829 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 835 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501662&loc=d3e56162-110433 + Details
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- Definition Amount of the cost of borrowed funds accounted for as interest expense for debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 + Details
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