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v2.4.1.9

Shareholders' Equity (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Schedule of Capitalization, Equity [Line Items] |  |  |
Preferred Stock, shares authorized | 20,000,000 us-gaap_PreferredStockSharesAuthorized |  |
Par value of preferred stock (per share) | $ 0.1 us-gaap_PreferredStockParOrStatedValuePerShare |  |
Common stock, shares authorized | 100,000,000 us-gaap_CommonStockSharesAuthorized | 100,000,000 us-gaap_CommonStockSharesAuthorized |
Par value of common stock (per share) | $ 0.1 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.1 us-gaap_CommonStockParOrStatedValuePerShare |
Preferred stock, shares issued | 0 us-gaap_PreferredStockSharesIssued | 0 us-gaap_PreferredStockSharesIssued |
Preferred stock, shares outstanding | 0 us-gaap_PreferredStockSharesOutstanding | 0 us-gaap_PreferredStockSharesOutstanding |
Common stock, shares outstanding | 52,418,246 us-gaap_CommonStockSharesOutstanding | 55,653,437 us-gaap_CommonStockSharesOutstanding |
Stock Repurchased and retired during period, Shares | (3,200,000)us-gaap_StockRepurchasedAndRetiredDuringPeriodShares | (3,000,000)us-gaap_StockRepurchasedAndRetiredDuringPeriodShares | (2,000,000)us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
Repurchases of common stock | $ (115,500,000)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue | $ (100,400,000)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue | $ (60,700,000)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
Company Action Level RBC, as Percentage of Authorized Control Level RBC | 200.00%kmpr_CompanyActionLevelRBCasPercentageofAuthorizedControlLevelRBC |  |
Dividends paid | 51,800,000 us-gaap_PaymentsOfDividendsCommonStock | 54,900,000 us-gaap_PaymentsOfDividendsCommonStock | 56,900,000 us-gaap_PaymentsOfDividendsCommonStock
Amount available for dividend payment | 268,000,000 kmpr_DividendsToShareholdersThatCanBePaidByParentCompanyWithoutRestrictions |  |
Kemper's Insurance Subsidiaries [Member] |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |
Cash dividends paid by Kemper's Insurance Subsidiaries to Kemper | 217,500,000 us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |
Amount available for dividend payments | 218,000,000 us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPayments / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |
Amount of restricted net assets for consolidated and unconsolidated subsidiaries | 2,400,000,000 us-gaap_AmountOfRestrictedNetAssetsForConsolidatedAndUnconsolidatedSubsidiaries / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |
Life and Health [Member] |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |
Statutory capital and surplus for the Company’s life and health insurance subsidiaries | 437,300,000 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / dei_LegalEntityAxis = kmpr_LifeAndHealthMember | 430,200,000 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / dei_LegalEntityAxis = kmpr_LifeAndHealthMember |
Statutory net income for the Company’s life and health insurance subsidiaries | 100,700,000 us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount / dei_LegalEntityAxis = kmpr_LifeAndHealthMember | 81,500,000 us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount / dei_LegalEntityAxis = kmpr_LifeAndHealthMember | 102,000,000 us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount / dei_LegalEntityAxis = kmpr_LifeAndHealthMember
Statutory capital and surplus required | 125,400,000 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusRequired / dei_LegalEntityAxis = kmpr_LifeAndHealthMember |  |
Property and Casualty Insurance [Member] |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |
Statutory capital and surplus for the Company’s life and health insurance subsidiaries | 947,500,000 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / dei_LegalEntityAxis = kmpr_PropertyAndCasualtyInsuranceMember | 989,700,000 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / dei_LegalEntityAxis = kmpr_PropertyAndCasualtyInsuranceMember |
Statutory net income for the Company’s life and health insurance subsidiaries | 85,700,000 us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount / dei_LegalEntityAxis = kmpr_PropertyAndCasualtyInsuranceMember | 138,800,000 us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount / dei_LegalEntityAxis = kmpr_PropertyAndCasualtyInsuranceMember | 40,600,000 us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount / dei_LegalEntityAxis = kmpr_PropertyAndCasualtyInsuranceMember
Statutory capital and surplus required | $ 288,700,000 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusRequired / dei_LegalEntityAxis = kmpr_PropertyAndCasualtyInsuranceMember |  |
Restricted Stock [Member] |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |
Common stock, shares outstanding | 163,720 us-gaap_CommonStockSharesOutstanding / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 278,427 us-gaap_CommonStockSharesOutstanding / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |

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