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Schedule 2 - Parent Company Financial Statements - Statements of Cash Flows (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Operating Activities: |  |  |
Net Income | $ 114.5 us-gaap_ProfitLoss | $ 217.7 us-gaap_ProfitLoss | $ 103.4 us-gaap_ProfitLoss
Adjustment Required to Reconcile Net Income to Net Cash Provided by Operations: |  |  |
Net Realized (Gains) Losses on Sales of Investments | (39.1)us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments | (99.1)us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments | (65.4)us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments
Net Impairment Losses Recognized in Earnings | 15.2 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet | 13.9 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet | 6.9 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
Other, Net | 16.4 us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet | 36.1 us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet | 33.4 us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
Net Cash Provided by Operating Activities | 133.6 us-gaap_NetCashProvidedByUsedInOperatingActivities | 122.1 us-gaap_NetCashProvidedByUsedInOperatingActivities | 65.7 us-gaap_NetCashProvidedByUsedInOperatingActivities
Investing Activities: |  |  |
Sales, Paydowns and Maturities of Fixed Maturities | 573.7 kmpr_SalesPaydownsandMaturitiesofFixedMaturities | 664.4 kmpr_SalesPaydownsandMaturitiesofFixedMaturities | 914.4 kmpr_SalesPaydownsandMaturitiesofFixedMaturities
Sales of Equity Securities | 245.3 us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesEquity | 182.1 us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesEquity | 70.8 us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesEquity
Sales of Fair Value Option Investments | 6.9 kmpr_ProceedsfromSalesofFairValueOptionInvestments | 0 kmpr_ProceedsfromSalesofFairValueOptionInvestments | 0 kmpr_ProceedsfromSalesofFairValueOptionInvestments
Purchases of Fair Value Option Investments | (60.9)kmpr_PaymentstoAcquireFairValueOptionInvestments | 0 kmpr_PaymentstoAcquireFairValueOptionInvestments | 0 kmpr_PaymentstoAcquireFairValueOptionInvestments
Change in Short-term Investments | (63.9)us-gaap_PaymentsForProceedsFromShortTermInvestments | 41.8 us-gaap_PaymentsForProceedsFromShortTermInvestments | (80.0)us-gaap_PaymentsForProceedsFromShortTermInvestments
Net Cash Provided (Used) by Investing Activities | (104.3)us-gaap_NetCashProvidedByUsedInInvestingActivities | 4.8 us-gaap_NetCashProvidedByUsedInInvestingActivities | (106.2)us-gaap_NetCashProvidedByUsedInInvestingActivities
Financing Activities: |  |  |
Cash Dividends Paid | (51.8)us-gaap_PaymentsOfDividendsCommonStock | (54.9)us-gaap_PaymentsOfDividendsCommonStock | (56.9)us-gaap_PaymentsOfDividendsCommonStock
Common Stock Repurchases | (114.0)us-gaap_PaymentsForRepurchaseOfCommonStock | (100.4)us-gaap_PaymentsForRepurchaseOfCommonStock | (60.7)us-gaap_PaymentsForRepurchaseOfCommonStock
Cash Exercise of Stock Options | 0.5 us-gaap_ProceedsFromStockOptionsExercised | 1.7 us-gaap_ProceedsFromStockOptionsExercised | 1.3 us-gaap_ProceedsFromStockOptionsExercised
Net Cash Used by Financing Activities | (19.7)us-gaap_NetCashProvidedByUsedInFinancingActivities | (156.7)us-gaap_NetCashProvidedByUsedInFinancingActivities | (114.4)us-gaap_NetCashProvidedByUsedInFinancingActivities
Increase (Decrease) in Cash | 9.6 us-gaap_CashPeriodIncreaseDecrease | (29.8)us-gaap_CashPeriodIncreaseDecrease | (154.9)us-gaap_CashPeriodIncreaseDecrease
Cash, Beginning of Year | 66.5 us-gaap_Cash | 96.3 us-gaap_Cash | 251.2 us-gaap_Cash
Cash, End of Year | 76.1 us-gaap_Cash | 66.5 us-gaap_Cash | 96.3 us-gaap_Cash
Parent Company [Member] |  |  |
Operating Activities: |  |  |
Net Income | 114.5 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 217.7 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 103.4 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Adjustment Required to Reconcile Net Income to Net Cash Provided by Operations: |  |  |
Equity in Net Income of Subsidiaries | (147.2)kmpr_EquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (256.7)kmpr_EquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (137.8)kmpr_EquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash Dividends from Subsidiaries | 159.1 us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 95.0 us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 95.0 us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash Contribution to Defined Benefit Plan | 0 us-gaap_PensionAndOtherPostretirementBenefitContributions / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (55.0)us-gaap_PensionAndOtherPostretirementBenefitContributions / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_PensionAndOtherPostretirementBenefitContributions / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net Realized (Gains) Losses on Sales of Investments | 0.2 us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (0.6)us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (0.3)us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net Impairment Losses Recognized in Earnings | 1.7 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other, Net | 10.5 us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 67.3 us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 8.5 us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net Cash Provided by Operating Activities | 138.8 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 67.7 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 68.8 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Investing Activities: |  |  |
Capital Distribution from Subsidiary | 1.1 kmpr_CapitalDistributionFromSubsidiary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 50.5 kmpr_CapitalDistributionFromSubsidiary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 20.0 kmpr_CapitalDistributionFromSubsidiary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Sales, Paydowns and Maturities of Fixed Maturities | 11.5 kmpr_SalesPaydownsandMaturitiesofFixedMaturities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 kmpr_SalesPaydownsandMaturitiesofFixedMaturities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 13.1 kmpr_SalesPaydownsandMaturitiesofFixedMaturities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Sales of Equity Securities | 15.1 us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Sales of Fair Value Option Investments | 6.9 kmpr_ProceedsfromSalesofFairValueOptionInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 kmpr_ProceedsfromSalesofFairValueOptionInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 kmpr_ProceedsfromSalesofFairValueOptionInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Purchases of Fair Value Option Investments | (60.9)kmpr_PaymentstoAcquireFairValueOptionInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 kmpr_PaymentstoAcquireFairValueOptionInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 kmpr_PaymentstoAcquireFairValueOptionInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Change in Short-term Investments | (94.3)us-gaap_PaymentsForProceedsFromShortTermInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 52.7 us-gaap_PaymentsForProceedsFromShortTermInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (106.3)us-gaap_PaymentsForProceedsFromShortTermInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net Cash Provided (Used) by Investing Activities | (120.6)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 103.2 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (73.2)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Financing Activities: |  |  |
Net Proceeds from Issuance of Subordinated Debentures | 144.0 us-gaap_ProceedsFromNotesPayable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_ProceedsFromNotesPayable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_ProceedsFromNotesPayable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash Dividends Paid | (51.8)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (54.9)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (56.9)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Common Stock Repurchases | (114.0)us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (100.4)us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (60.7)us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash Exercise of Stock Options | 0.5 us-gaap_ProceedsFromStockOptionsExercised / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1.7 us-gaap_ProceedsFromStockOptionsExercised / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1.3 us-gaap_ProceedsFromStockOptionsExercised / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Excess Tax Benefits on Share Based Awards | 0.2 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1.3 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0.5 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net Cash Used by Financing Activities | (21.1)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (152.3)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (115.8)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Increase (Decrease) in Cash | (2.9)us-gaap_CashPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 18.6 us-gaap_CashPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (120.2)us-gaap_CashPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash, Beginning of Year | 20.8 us-gaap_Cash / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2.2 us-gaap_Cash / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 122.4 us-gaap_Cash / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash, End of Year | $ 17.9 us-gaap_Cash / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 20.8 us-gaap_Cash / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 2.2 us-gaap_Cash / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8B -URI http://asc.fasb.org/extlink&oid=27724398&loc=SL6284393-111563 + Details
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- Definition The net amount paid (received) by the reporting entity through acquisition or sale and maturities of short-term investments with an original maturity that is three months or less which qualify for treatment as an investing activity based on management's intention and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3095-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585 + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The amount of cash or cash equivalents contributed during the reporting period by the entity to fund its pension plans and its non-pension postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition The cash inflow from a borrowing supported by a written promise to pay an obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash inflow associated with the sale of equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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