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Discontinued Operations (Details) (USD $) In Millions, except Per Share data, 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 | Dec. 31, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain on Sale of Loan Portfolios |  |  |  |  |  |  |  |  | $ 0 us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax | $ 0 us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax | $ 12.9 us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax |
Discontinued Operation, Income (Loss) from Discontinued Operation Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Gain on Sale of Loan Portfolios |  |  |  |  |  |  |  |  | 0 us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax | 0 us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax | 12.9 us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax |
Income from Discontinued Operations before Income Taxes |  |  |  |  |  |  |  |  | 3.0 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax | 4.9 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax | 18.9 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax |
Income Tax Expense |  |  |  |  |  |  |  |  | (1.1)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation | (1.7)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation | (7.3)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation |
Income from Discontinued Operations | 2.1 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (0.1)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (0.1)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 0.4 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 1.5 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 1.5 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (0.2)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 1.9 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 3.2 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 11.6 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |
Income from Discontinued Operations Per Unrestricted Share: |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.04 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.06 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.20 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare |
Diluted (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.04 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.06 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.20 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare |
Property and Casualty | 733.9 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpensePropertyCasualtyLiability |  |  |  | 843.5 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpensePropertyCasualtyLiability |  |  |  | 733.9 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpensePropertyCasualtyLiability | 843.5 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpensePropertyCasualtyLiability | 970.6 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpensePropertyCasualtyLiability | 1,029.1 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpensePropertyCasualtyLiability
Fireside [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain on Sale of Loan Portfolios |  |  |  |  |  |  |  |  | 0 us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = kmpr_FiresideMember | 0 us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = kmpr_FiresideMember | 12.9 us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = kmpr_FiresideMember |
Discontinued Operation, Income (Loss) from Discontinued Operation Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |  |  | 0 us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = kmpr_FiresideMember | 0 us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = kmpr_FiresideMember | (0.2)us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = kmpr_FiresideMember |
Gain on Sale of Loan Portfolios |  |  |  |  |  |  |  |  | 0 us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = kmpr_FiresideMember | 0 us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = kmpr_FiresideMember | 12.9 us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = kmpr_FiresideMember |
Unitrin Business Insurance [Member] |  |  |  |  |  |  |  |  |  |  |  |
Discontinued Operation, Income (Loss) from Discontinued Operation Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Results of Operations |  |  |  |  |  |  |  |  | 3.0 us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = kmpr_UnitrinBusinessInsuranceMember | 4.9 us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = kmpr_UnitrinBusinessInsuranceMember | 6.2 us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = kmpr_UnitrinBusinessInsuranceMember |
Income from Discontinued Operations Per Unrestricted Share: |  |  |  |  |  |  |  |  |  |  |  |
Property and Casualty | 69.3 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpensePropertyCasualtyLiability / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = kmpr_UnitrinBusinessInsuranceMember |  |  |  | 82.0 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpensePropertyCasualtyLiability / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = kmpr_UnitrinBusinessInsuranceMember |  |  |  | 69.3 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpensePropertyCasualtyLiability / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = kmpr_UnitrinBusinessInsuranceMember | 82.0 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpensePropertyCasualtyLiability / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = kmpr_UnitrinBusinessInsuranceMember |  |
Inactive Loan Portfolio [Member] | Fireside [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain on Sale of Loan Portfolios |  |  |  |  |  |  |  |  |  |  | 12.9 us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax / kmpr_AutomobileLoanTypeAxis = kmpr_InactiveLoanPortfolioMember / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = kmpr_FiresideMember |
Discontinued Operation, Income (Loss) from Discontinued Operation Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Gain on Sale of Loan Portfolios |  |  |  |  |  |  |  |  |  |  | $ 12.9 us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax / kmpr_AutomobileLoanTypeAxis = kmpr_InactiveLoanPortfolioMember / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = kmpr_FiresideMember |

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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to casualty insurance insured events that have occurred on or before a particular date (ordinarily, the balance sheet date) and the amount needed to provide for the estimated ultimate cost required to investigate and settle claims relating to insured events that have occurred on or before a particular date (ordinarily, the balance sheet date), whether or not reported to the insurer at that date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 18 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a),(b),(c) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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