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Schedule 2 - Parent Company Financial Statements - Balance Sheets (Details) (USD $) | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
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ASSETS |  |  |  |
Investments in Subsidiaries | $ 184,800,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures | $ 245,100,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures |  |
Fixed Maturities at Fair Value (Amortized Cost: 2014 – $12.2) | 4,777,600,000 us-gaap_AvailableForSaleSecuritiesDebtSecurities | 4,575,000,000 us-gaap_AvailableForSaleSecuritiesDebtSecurities |  |
Fair Value Option Investments | 53,300,000 kmpr_FairValueOptionInvestments | 0 kmpr_FairValueOptionInvestments |  |
Short-term Investments | 342,200,000 us-gaap_OtherShortTermInvestments | 284,700,000 us-gaap_OtherShortTermInvestments |  |
Cash | 76,100,000 us-gaap_Cash | 66,500,000 us-gaap_Cash | 96,300,000 us-gaap_Cash | 251,200,000 us-gaap_Cash
Other Receivables | 187,000,000 us-gaap_OtherReceivables | 193,100,000 us-gaap_OtherReceivables |  |
Other Assets | 220,200,000 us-gaap_OtherAssets | 267,400,000 us-gaap_OtherAssets |  |
Total Assets | 7,833,400,000 us-gaap_Assets | 7,656,400,000 us-gaap_Assets |  |
LIABILITIES AND SHAREHOLDERS’ EQUITY |  |  |  |
Notes Payable | 752,100,000 us-gaap_NotesPayable | 606,900,000 us-gaap_NotesPayable |  |
Liabilities for Income Taxes | 36,500,000 kmpr_LiabilitiesForIncomeTaxes | 8,300,000 kmpr_LiabilitiesForIncomeTaxes |  |
Accrued Expenses and Other Liabilities | 409,600,000 us-gaap_OtherLiabilities | 329,800,000 us-gaap_OtherLiabilities |  |
Total Liabilities | 5,742,700,000 us-gaap_Liabilities | 5,604,900,000 us-gaap_Liabilities |  |
Shareholders’ Equity: |  |  |  |
Additional Paid-in Capital | 660,100,000 us-gaap_AdditionalPaidInCapitalCommonStock | 694,800,000 us-gaap_AdditionalPaidInCapitalCommonStock |  |
Retained Earnings | 1,202,700,000 us-gaap_RetainedEarningsAccumulatedDeficit | 1,215,800,000 us-gaap_RetainedEarningsAccumulatedDeficit |  |
Accumulated Other Comprehensive Income | 222,700,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | 135,300,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |  |
Total Shareholders’ Equity | 2,090,700,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 2,051,500,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 2,161,700,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 2,116,600,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Total Liabilities and Shareholders’ Equity | 7,833,400,000 us-gaap_LiabilitiesAndStockholdersEquity | 7,656,400,000 us-gaap_LiabilitiesAndStockholdersEquity |  |
Parent Company [Member] |  |  |  |
ASSETS |  |  |  |
Investments in Subsidiaries | 2,677,500,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,614,000,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Fixed Maturities at Fair Value (Amortized Cost: 2014 – $12.2) | 12,200,000 us-gaap_AvailableForSaleSecuritiesDebtSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_AvailableForSaleSecuritiesDebtSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Equity Securities at Fair Value (Cost: 2014 – $21.9; 2013 – $4.7) | 21,800,000 kmpr_EquitySecuritiesatFairValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 5,000,000 kmpr_EquitySecuritiesatFairValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Fair Value Option Investments | 53,300,000 kmpr_FairValueOptionInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 kmpr_FairValueOptionInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Short-term Investments | 225,100,000 us-gaap_OtherShortTermInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 130,800,000 us-gaap_OtherShortTermInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Cash | 17,900,000 us-gaap_Cash / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 20,800,000 us-gaap_Cash / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,200,000 us-gaap_Cash / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 122,400,000 us-gaap_Cash / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other Receivables | 6,900,000 us-gaap_OtherReceivables / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 4,900,000 us-gaap_OtherReceivables / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Current and Deferred Income Taxes | 4,700,000 kmpr_CurrentAndDeferredIncomeTaxAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 35,000,000 kmpr_CurrentAndDeferredIncomeTaxAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other Assets | 5,600,000 us-gaap_OtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 7,300,000 us-gaap_OtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total Assets | 3,025,000,000 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,817,800,000 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
LIABILITIES AND SHAREHOLDERS’ EQUITY |  |  |  |
Liabilities for Income Taxes | 14,500,000 kmpr_LiabilitiesForIncomeTaxes / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 90,500,000 kmpr_LiabilitiesForIncomeTaxes / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Liabilities for Benefit Plans | 160,200,000 kmpr_LiabilitiesForBenefitPlans / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 63,900,000 kmpr_LiabilitiesForBenefitPlans / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Accrued Expenses and Other Liabilities | 7,500,000 us-gaap_OtherLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 5,000,000 us-gaap_OtherLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total Liabilities | 934,300,000 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 766,300,000 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Shareholders’ Equity: |  |  |  |
Common Stock | 5,200,000 us-gaap_CommonStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 5,600,000 us-gaap_CommonStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Additional Paid-in Capital | 660,100,000 us-gaap_AdditionalPaidInCapitalCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 694,800,000 us-gaap_AdditionalPaidInCapitalCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Retained Earnings | 1,202,700,000 us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,215,800,000 us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Accumulated Other Comprehensive Income | 222,700,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 135,300,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total Shareholders’ Equity | 2,090,700,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,051,500,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total Liabilities and Shareholders’ Equity | 3,025,000,000 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,817,800,000 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Parent Company [Member] | Senior Notes, 6% Due May 15, 2017 [Member] |  |  |  |
LIABILITIES AND SHAREHOLDERS’ EQUITY |  |  |  |
Notes Payable | 358,500,000 us-gaap_NotesPayable / us-gaap_DebtInstrumentAxis = kmpr_SeniorNotes6PercentDueMay152017Member / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 357,900,000 us-gaap_NotesPayable / us-gaap_DebtInstrumentAxis = kmpr_SeniorNotes6PercentDueMay152017Member / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Parent Company [Member] | Senior Notes, 6% Due November 30, 2015 [Member] |  |  |  |
LIABILITIES AND SHAREHOLDERS’ EQUITY |  |  |  |
Notes Payable | 249,500,000 us-gaap_NotesPayable / us-gaap_DebtInstrumentAxis = kmpr_SeniorNotes6PercentDueNovember302015Member / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 249,000,000 us-gaap_NotesPayable / us-gaap_DebtInstrumentAxis = kmpr_SeniorNotes6PercentDueNovember302015Member / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Parent Company [Member] | Subordinated Debenture, 7.375 Percent Due 2054 [Member] |  |  |  |
LIABILITIES AND SHAREHOLDERS’ EQUITY |  |  |  |
Notes Payable | $ 144,100,000 us-gaap_NotesPayable / us-gaap_DebtInstrumentAxis = kmpr_SubordinatedDebenture7.375PercentDue2054Member / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 0 us-gaap_NotesPayable / us-gaap_DebtInstrumentAxis = kmpr_SubordinatedDebenture7.375PercentDue2054Member / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |

X
- Definition The sum of (a) Carrying amount due within one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes and (b) the aggregate tax effects as of the balance sheet date of all future tax deductions arising from temporary differences between tax basis and generally accepted accounting principles basis recognition of assets, liabilities, revenues and expenses, which can only be deducted for tax purposes when permitted under enacted tax laws; net of deducting the allocated valuation allowance, if any, to reduce such amount to net realizable value. + References No definition available. + Details
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