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Quarterly Financial Information (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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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
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums | $ 451.5 us-gaap_PremiumsEarnedNet | $ 462.8 us-gaap_PremiumsEarnedNet | $ 470.3 us-gaap_PremiumsEarnedNet | $ 477.6 us-gaap_PremiumsEarnedNet | $ 495.6 us-gaap_PremiumsEarnedNet | $ 507.5 us-gaap_PremiumsEarnedNet | $ 512.8 us-gaap_PremiumsEarnedNet | $ 509.9 us-gaap_PremiumsEarnedNet | $ 1,862.2 us-gaap_PremiumsEarnedNet | $ 2,025.8 us-gaap_PremiumsEarnedNet | $ 2,107.1 us-gaap_PremiumsEarnedNet
Net Investment Income | 93.1 us-gaap_NetInvestmentIncome | 72.3 us-gaap_NetInvestmentIncome | 72.6 us-gaap_NetInvestmentIncome | 71.1 us-gaap_NetInvestmentIncome | 76.9 us-gaap_NetInvestmentIncome | 82.4 us-gaap_NetInvestmentIncome | 74.6 us-gaap_NetInvestmentIncome | 80.8 us-gaap_NetInvestmentIncome | 309.1 us-gaap_NetInvestmentIncome | 314.7 us-gaap_NetInvestmentIncome | 295.9 us-gaap_NetInvestmentIncome
Other Income | 0.6 us-gaap_OtherIncome | 0.5 us-gaap_OtherIncome | 0.2 us-gaap_OtherIncome | 0.1 us-gaap_OtherIncome | 0.3 us-gaap_OtherIncome | 0.1 us-gaap_OtherIncome | 0.2 us-gaap_OtherIncome | 0.2 us-gaap_OtherIncome | 1.4 us-gaap_OtherIncome | 0.8 us-gaap_OtherIncome | 0.8 us-gaap_OtherIncome
Net Realized Gains on Sales of Investments | 21.0 us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments | 8.0 us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments | 3.5 us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments | 6.6 us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments | 20.8 us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments | 49.1 us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments | 2.3 us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments | 26.9 us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments | 39.1 us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments | 99.1 us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments | 65.4 us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments
Other-than-temporary Impairment Losses: |  |  |  |  |  |  |  |  |  |  |
Total Other-than-temporary Impairment Losses | (6.5)us-gaap_ImpairmentOfInvestments | (3.8)us-gaap_ImpairmentOfInvestments | (4.1)us-gaap_ImpairmentOfInvestments | (0.8)us-gaap_ImpairmentOfInvestments | (7.6)us-gaap_ImpairmentOfInvestments | (3.5)us-gaap_ImpairmentOfInvestments | (2.3)us-gaap_ImpairmentOfInvestments | (2.4)us-gaap_ImpairmentOfInvestments | (15.2)us-gaap_ImpairmentOfInvestments | (15.8)us-gaap_ImpairmentOfInvestments | (7.2)us-gaap_ImpairmentOfInvestments
Portion of Losses Recognized in Other Comprehensive Income | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterest | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterest | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterest | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterest | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterest | 0.1 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterest | 1.3 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterest | 0.5 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterest | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterest | 1.9 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterest | 0.3 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterest
Net Impairment Losses Recognized in Earnings | (6.5)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet | (3.8)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet | (4.1)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet | (0.8)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet | (7.6)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet | (3.4)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet | (1.0)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet | (1.9)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet | (15.2)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet | (13.9)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet | (6.9)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
Total Revenues | 559.7 us-gaap_Revenues | 539.8 us-gaap_Revenues | 542.5 us-gaap_Revenues | 554.6 us-gaap_Revenues | 586.0 us-gaap_Revenues | 635.7 us-gaap_Revenues | 588.9 us-gaap_Revenues | 615.9 us-gaap_Revenues | 2,196.6 us-gaap_Revenues | 2,426.5 us-gaap_Revenues | 2,462.3 us-gaap_Revenues
Expenses [Abstract] |  |  |  |  |  |  |  |  |  |  |
Policyholders’ Benefits and Incurred Losses and Loss Adjustment Expenses | 285.8 us-gaap_PolicyholderBenefitsAndClaimsIncurredNet | 300.5 us-gaap_PolicyholderBenefitsAndClaimsIncurredNet | 347.5 us-gaap_PolicyholderBenefitsAndClaimsIncurredNet | 327.9 us-gaap_PolicyholderBenefitsAndClaimsIncurredNet | 315.5 us-gaap_PolicyholderBenefitsAndClaimsIncurredNet | 338.3 us-gaap_PolicyholderBenefitsAndClaimsIncurredNet | 354.2 us-gaap_PolicyholderBenefitsAndClaimsIncurredNet | 349.2 us-gaap_PolicyholderBenefitsAndClaimsIncurredNet | 1,261.7 us-gaap_PolicyholderBenefitsAndClaimsIncurredNet | 1,357.2 us-gaap_PolicyholderBenefitsAndClaimsIncurredNet | 1,582.1 us-gaap_PolicyholderBenefitsAndClaimsIncurredNet
Insurance Expenses | 156.4 us-gaap_OtherExpenses | 158.6 us-gaap_OtherExpenses | 161.3 us-gaap_OtherExpenses | 152.1 us-gaap_OtherExpenses | 162.9 us-gaap_OtherExpenses | 170.1 us-gaap_OtherExpenses | 163.1 us-gaap_OtherExpenses | 158.3 us-gaap_OtherExpenses | 628.4 us-gaap_OtherExpenses | 654.4 us-gaap_OtherExpenses | 672.3 us-gaap_OtherExpenses
Write-off of Long-lived Asset | 0 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse | 54.6 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse | 0 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse | 0 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse |  |  |  |  | 54.6 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse | 0 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse | 0 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Interest and Other Expenses | 24.4 kmpr_InterestAndOtherExpenses | 22.1 kmpr_InterestAndOtherExpenses | 22.5 kmpr_InterestAndOtherExpenses | 22.7 kmpr_InterestAndOtherExpenses | 26.2 kmpr_InterestAndOtherExpenses | 25.3 kmpr_InterestAndOtherExpenses | 25.2 kmpr_InterestAndOtherExpenses | 23.8 kmpr_InterestAndOtherExpenses | 91.7 kmpr_InterestAndOtherExpenses | 100.5 kmpr_InterestAndOtherExpenses | 85.5 kmpr_InterestAndOtherExpenses
Total Expenses | 466.6 us-gaap_OperatingExpenses | 535.8 us-gaap_OperatingExpenses | 531.3 us-gaap_OperatingExpenses | 502.7 us-gaap_OperatingExpenses | 504.6 us-gaap_OperatingExpenses | 533.7 us-gaap_OperatingExpenses | 542.5 us-gaap_OperatingExpenses | 531.3 us-gaap_OperatingExpenses | 2,036.4 us-gaap_OperatingExpenses | 2,112.1 us-gaap_OperatingExpenses | 2,339.9 us-gaap_OperatingExpenses
Income from Continuing Operations before Income Taxes | 93.1 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 4.0 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 11.2 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 51.9 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 81.4 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 102.0 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 46.4 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 84.6 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 160.2 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 314.4 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 122.4 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income Tax Benefit (Expense) | (29.8)us-gaap_IncomeTaxExpenseBenefit | 0.8 us-gaap_IncomeTaxExpenseBenefit | (1.9)us-gaap_IncomeTaxExpenseBenefit | (16.7)us-gaap_IncomeTaxExpenseBenefit | (26.6)us-gaap_IncomeTaxExpenseBenefit | (33.4)us-gaap_IncomeTaxExpenseBenefit | (13.9)us-gaap_IncomeTaxExpenseBenefit | (26.0)us-gaap_IncomeTaxExpenseBenefit | (47.6)us-gaap_IncomeTaxExpenseBenefit | (99.9)us-gaap_IncomeTaxExpenseBenefit | (30.6)us-gaap_IncomeTaxExpenseBenefit
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
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
Net Income | $ 65.4 us-gaap_ProfitLoss | $ 4.7 us-gaap_ProfitLoss | $ 9.3 us-gaap_ProfitLoss | $ 35.1 us-gaap_ProfitLoss | $ 55.2 us-gaap_ProfitLoss | $ 70.1 us-gaap_ProfitLoss | $ 34.0 us-gaap_ProfitLoss | $ 58.4 us-gaap_ProfitLoss | $ 114.5 us-gaap_ProfitLoss | $ 217.7 us-gaap_ProfitLoss | $ 103.4 us-gaap_ProfitLoss
Income (Loss) from Continuing Operations Per Unrestricted Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income from Continuing Operations Per Unrestricted Share - Basic | $ 1.20 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.09 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.17 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.63 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.98 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 1.21 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.56 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 1.00 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 2.08 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 3.75 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 1.55 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Income from Continuing Operations Per Unrestricted Share - Diluted | $ 1.20 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.09 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.17 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.63 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.98 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 1.21 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.56 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 1.00 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 2.08 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 3.74 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 1.54 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Net Income (Loss) Per Unrestricted Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Income Per Unrestricted Share - Basic | $ 1.24 us-gaap_EarningsPerShareBasic | $ 0.09 us-gaap_EarningsPerShareBasic | $ 0.17 us-gaap_EarningsPerShareBasic | $ 0.63 us-gaap_EarningsPerShareBasic | $ 0.99 us-gaap_EarningsPerShareBasic | $ 1.24 us-gaap_EarningsPerShareBasic | $ 0.59 us-gaap_EarningsPerShareBasic | $ 1.00 us-gaap_EarningsPerShareBasic | $ 2.12 us-gaap_EarningsPerShareBasic | $ 3.81 us-gaap_EarningsPerShareBasic | $ 1.75 us-gaap_EarningsPerShareBasic
Net Income Per Unrestricted Share - Diluted | $ 1.24 us-gaap_EarningsPerShareDiluted | $ 0.09 us-gaap_EarningsPerShareDiluted | $ 0.17 us-gaap_EarningsPerShareDiluted | $ 0.63 us-gaap_EarningsPerShareDiluted | $ 0.99 us-gaap_EarningsPerShareDiluted | $ 1.23 us-gaap_EarningsPerShareDiluted | $ 0.59 us-gaap_EarningsPerShareDiluted | $ 1.00 us-gaap_EarningsPerShareDiluted | $ 2.12 us-gaap_EarningsPerShareDiluted | $ 3.80 us-gaap_EarningsPerShareDiluted | $ 1.74 us-gaap_EarningsPerShareDiluted
Dividends Paid to Shareholders Per Share | $ 0.24 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.24 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.24 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.24 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.24 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.24 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.24 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.24 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.96 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.96 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.96 us-gaap_CommonStockDividendsPerShareCashPaid

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