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Business Segments - Segment Net Income (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Operating Income |  |  |  |  |  |  |  |  | $ 97.1 kmpr_OperatingIncomeLossNetOfTaxes | $ 159.2 kmpr_OperatingIncomeLossNetOfTaxes | $ 53.8 kmpr_OperatingIncomeLossNetOfTaxes
Income from Continuing Operations | 63.3 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 4.8 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 9.3 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 35.2 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 54.8 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 68.6 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 32.5 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 58.6 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 112.6 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 214.5 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 91.8 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Operating Income |  |  |  |  |  |  |  |  | 116.7 kmpr_OperatingIncomeLossNetOfTaxes / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 189.9 kmpr_OperatingIncomeLossNetOfTaxes / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 79.9 kmpr_OperatingIncomeLossNetOfTaxes / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Operating Segments [Member] | Property and Casualty Insurance [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Operating Income |  |  |  |  |  |  |  |  | 24.9 kmpr_OperatingIncomeLossNetOfTaxes / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = kmpr_PropertyAndCasualtyInsuranceMember | 100.6 kmpr_OperatingIncomeLossNetOfTaxes / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = kmpr_PropertyAndCasualtyInsuranceMember | (10.9)kmpr_OperatingIncomeLossNetOfTaxes / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = kmpr_PropertyAndCasualtyInsuranceMember
Operating Segments [Member] | Life and Health Insurance [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Operating Income |  |  |  |  |  |  |  |  | 91.8 kmpr_OperatingIncomeLossNetOfTaxes / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = kmpr_LifeAndHealthInsuranceMember | 89.3 kmpr_OperatingIncomeLossNetOfTaxes / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = kmpr_LifeAndHealthInsuranceMember | 90.8 kmpr_OperatingIncomeLossNetOfTaxes / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = kmpr_LifeAndHealthInsuranceMember
Corporate, Non-Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Operating Income |  |  |  |  |  |  |  |  | (19.6)kmpr_OperatingIncomeLossNetOfTaxes / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | (30.7)kmpr_OperatingIncomeLossNetOfTaxes / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | (26.1)kmpr_OperatingIncomeLossNetOfTaxes / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember
Segment Reconciling Items [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Realized Gains on Sales of Investments |  |  |  |  |  |  |  |  | 25.4 kmpr_GainLossOnSaleOfInvestmentsNetOfTax / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | 64.4 kmpr_GainLossOnSaleOfInvestmentsNetOfTax / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | 42.5 kmpr_GainLossOnSaleOfInvestmentsNetOfTax / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember
Net Impairment Losses Recognized in Earnings |  |  |  |  |  |  |  |  | $ 9.9 kmpr_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetOfTax / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | $ 9.1 kmpr_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetOfTax / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | $ 4.5 kmpr_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetOfTax / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember

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- Definition Gain (Loss) on Sale of Investments, Net of Tax + References No definition available. + Details
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- Definition Operating Income Loss, Net Of Taxes + References No definition available. + Details
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- Definition Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net of Tax + References No definition available. + Details
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- Definition This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683 + Details
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