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Schedule 2 - Parent Company Financial Statements - Balance Sheets (Parenthetical) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Amortized Cost of Fixed Maturity Securities | $ 4,341.7 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis | $ 4,370.5 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Fair Value of Notes Payable | 804.4 us-gaap_NotesPayableFairValueDisclosure | 667.1 us-gaap_NotesPayableFairValueDisclosure
Senior Notes [Member] | Senior Notes Payable, 6.00% due 2017 [Member] |  |
Senior Notes Payable, Interest Rate | 6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = kmpr_SeniorNotes6PercentDueMay152017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
Senior Notes [Member] | Senior Notes Payable, 6.00% due 2015 [Member] |  |
Senior Notes Payable, Interest Rate | 6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = kmpr_SeniorNotes6PercentDueNovember302015Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
Subordinated Debt [Member] | Subordinated Debenture, 7.375 Percent Due 2054 [Member] |  |
Senior Notes Payable, Interest Rate | 7.375%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = kmpr_SubordinatedDebenture7.375PercentDue2054Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SubordinatedDebtMember |
Parent Company [Member] |  |
Amortized Cost of Fixed Maturity Securities | 12.2 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Equity Securities at Cost | 21.9 kmpr_EquitySecuritiesatCost / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 4.7 kmpr_EquitySecuritiesatCost / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Parent Company [Member] | Senior Notes [Member] | Senior Notes Payable, 6.00% due 2017 [Member] |  |
Fair Value of Notes Payable | 390.2 us-gaap_NotesPayableFairValueDisclosure / us-gaap_DebtInstrumentAxis = kmpr_SeniorNotes6PercentDueMay152017Member / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 395.5 us-gaap_NotesPayableFairValueDisclosure / us-gaap_DebtInstrumentAxis = kmpr_SeniorNotes6PercentDueMay152017Member / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Senior Notes Payable, Interest Rate | 6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = kmpr_SeniorNotes6PercentDueMay152017Member / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = kmpr_SeniorNotes6PercentDueMay152017Member / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Parent Company [Member] | Senior Notes [Member] | Senior Notes Payable, 6.00% due 2015 [Member] |  |
Fair Value of Notes Payable | 260.2 us-gaap_NotesPayableFairValueDisclosure / us-gaap_DebtInstrumentAxis = kmpr_SeniorNotes6PercentDueNovember302015Member / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 271.6 us-gaap_NotesPayableFairValueDisclosure / us-gaap_DebtInstrumentAxis = kmpr_SeniorNotes6PercentDueNovember302015Member / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Senior Notes Payable, Interest Rate | 6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = kmpr_SeniorNotes6PercentDueNovember302015Member / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = kmpr_SeniorNotes6PercentDueNovember302015Member / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Parent Company [Member] | Subordinated Debt [Member] | Subordinated Debenture, 7.375 Percent Due 2054 [Member] |  |
Fair Value of Notes Payable | $ 154.0 us-gaap_NotesPayableFairValueDisclosure / us-gaap_DebtInstrumentAxis = kmpr_SubordinatedDebenture7.375PercentDue2054Member / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SubordinatedDebtMember |

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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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