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Investments - Unrealized Gains and Gross Unrealized Losses in Investment in Equity Securities (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Schedule of Available-for-sale Securities [Line Items] |  |
Equity Securities at Cost | $ 561.5 us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis | $ 530.0 us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
Gross Unrealized Gains | 75.7 us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax | 74.7 us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Gross Unrealized Losses | (5.0)us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax | (6.2)us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Equity Securities at Fair Value | 632.2 us-gaap_AvailableForSaleSecuritiesEquitySecurities | 598.5 us-gaap_AvailableForSaleSecuritiesEquitySecurities
Exchange Traded Funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Equity Securities at Cost | 195.2 us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ExchangeTradedFundsMember | 122.0 us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ExchangeTradedFundsMember
Gross Unrealized Gains | 8.2 us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ExchangeTradedFundsMember | 3.9 us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ExchangeTradedFundsMember
Gross Unrealized Losses | (0.7)us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ExchangeTradedFundsMember | (1.0)us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ExchangeTradedFundsMember
Equity Securities at Fair Value | 202.7 us-gaap_AvailableForSaleSecuritiesEquitySecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ExchangeTradedFundsMember | 124.9 us-gaap_AvailableForSaleSecuritiesEquitySecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ExchangeTradedFundsMember
Limited Liability Companies and Limited Partnerships [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Equity Securities at Cost | 160.3 us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_PartnershipInterestMember | 150.3 us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_PartnershipInterestMember
Gross Unrealized Gains | 27.7 us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_PartnershipInterestMember | 25.2 us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_PartnershipInterestMember
Gross Unrealized Losses | (1.8)us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_PartnershipInterestMember | (1.6)us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_PartnershipInterestMember
Equity Securities at Fair Value | 186.2 us-gaap_AvailableForSaleSecuritiesEquitySecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_PartnershipInterestMember | 173.9 us-gaap_AvailableForSaleSecuritiesEquitySecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_PartnershipInterestMember
Finance, Insurance and Real Estate [Member] | Preferred Stock [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Equity Securities at Cost | 85.5 us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis / us-gaap_EquitySecuritiesByIndustryAxis = kmpr_FinanceInsuranceandRealEstateMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_PreferredStockMember | 85.4 us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis / us-gaap_EquitySecuritiesByIndustryAxis = kmpr_FinanceInsuranceandRealEstateMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_PreferredStockMember
Gross Unrealized Gains | 5.2 us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_EquitySecuritiesByIndustryAxis = kmpr_FinanceInsuranceandRealEstateMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_PreferredStockMember | 2.9 us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_EquitySecuritiesByIndustryAxis = kmpr_FinanceInsuranceandRealEstateMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_PreferredStockMember
Gross Unrealized Losses | (1.0)us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_EquitySecuritiesByIndustryAxis = kmpr_FinanceInsuranceandRealEstateMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_PreferredStockMember | (2.5)us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_EquitySecuritiesByIndustryAxis = kmpr_FinanceInsuranceandRealEstateMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_PreferredStockMember
Equity Securities at Fair Value | 89.7 us-gaap_AvailableForSaleSecuritiesEquitySecurities / us-gaap_EquitySecuritiesByIndustryAxis = kmpr_FinanceInsuranceandRealEstateMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_PreferredStockMember | 85.8 us-gaap_AvailableForSaleSecuritiesEquitySecurities / us-gaap_EquitySecuritiesByIndustryAxis = kmpr_FinanceInsuranceandRealEstateMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_PreferredStockMember
All Industries Other than Finance, Insurance and Real Estate [Member] | Preferred Stock [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Equity Securities at Cost | 16.3 us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis / us-gaap_EquitySecuritiesByIndustryAxis = kmpr_AllIndustriesOtherthanFinanceInsuranceandRealEstateMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_PreferredStockMember | 20.1 us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis / us-gaap_EquitySecuritiesByIndustryAxis = kmpr_AllIndustriesOtherthanFinanceInsuranceandRealEstateMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_PreferredStockMember
Gross Unrealized Gains | 3.5 us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_EquitySecuritiesByIndustryAxis = kmpr_AllIndustriesOtherthanFinanceInsuranceandRealEstateMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_PreferredStockMember | 4.4 us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_EquitySecuritiesByIndustryAxis = kmpr_AllIndustriesOtherthanFinanceInsuranceandRealEstateMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_PreferredStockMember
Gross Unrealized Losses | 0 us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_EquitySecuritiesByIndustryAxis = kmpr_AllIndustriesOtherthanFinanceInsuranceandRealEstateMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_PreferredStockMember | (0.1)us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_EquitySecuritiesByIndustryAxis = kmpr_AllIndustriesOtherthanFinanceInsuranceandRealEstateMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_PreferredStockMember
Equity Securities at Fair Value | 19.8 us-gaap_AvailableForSaleSecuritiesEquitySecurities / us-gaap_EquitySecuritiesByIndustryAxis = kmpr_AllIndustriesOtherthanFinanceInsuranceandRealEstateMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_PreferredStockMember | 24.4 us-gaap_AvailableForSaleSecuritiesEquitySecurities / us-gaap_EquitySecuritiesByIndustryAxis = kmpr_AllIndustriesOtherthanFinanceInsuranceandRealEstateMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_PreferredStockMember
2000 to 3999 Manufacturing [Member] | Common Stock [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Equity Securities at Cost | 43.4 us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis / us-gaap_EquitySecuritiesByIndustryAxis = sic_Z2000toZ3999 / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommonStockMember | 83.4 us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis / us-gaap_EquitySecuritiesByIndustryAxis = sic_Z2000toZ3999 / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommonStockMember
Gross Unrealized Gains | 14.9 us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_EquitySecuritiesByIndustryAxis = sic_Z2000toZ3999 / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommonStockMember | 21.3 us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_EquitySecuritiesByIndustryAxis = sic_Z2000toZ3999 / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommonStockMember
Gross Unrealized Losses | (1.1)us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_EquitySecuritiesByIndustryAxis = sic_Z2000toZ3999 / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommonStockMember | (0.1)us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_EquitySecuritiesByIndustryAxis = sic_Z2000toZ3999 / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommonStockMember
Equity Securities at Fair Value | 57.2 us-gaap_AvailableForSaleSecuritiesEquitySecurities / us-gaap_EquitySecuritiesByIndustryAxis = sic_Z2000toZ3999 / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommonStockMember | 104.6 us-gaap_AvailableForSaleSecuritiesEquitySecurities / us-gaap_EquitySecuritiesByIndustryAxis = sic_Z2000toZ3999 / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommonStockMember
All Industries Other than Manufacturing [Member] | Common Stock [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Equity Securities at Cost | 60.8 us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis / us-gaap_EquitySecuritiesByIndustryAxis = kmpr_AllIndustriesOtherthanManufacturingMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommonStockMember | 68.8 us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis / us-gaap_EquitySecuritiesByIndustryAxis = kmpr_AllIndustriesOtherthanManufacturingMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommonStockMember
Gross Unrealized Gains | 16.2 us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_EquitySecuritiesByIndustryAxis = kmpr_AllIndustriesOtherthanManufacturingMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommonStockMember | 17.0 us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_EquitySecuritiesByIndustryAxis = kmpr_AllIndustriesOtherthanManufacturingMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommonStockMember
Gross Unrealized Losses | (0.4)us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_EquitySecuritiesByIndustryAxis = kmpr_AllIndustriesOtherthanManufacturingMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommonStockMember | (0.9)us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_EquitySecuritiesByIndustryAxis = kmpr_AllIndustriesOtherthanManufacturingMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommonStockMember
Equity Securities at Fair Value | $ 76.6 us-gaap_AvailableForSaleSecuritiesEquitySecurities / us-gaap_EquitySecuritiesByIndustryAxis = kmpr_AllIndustriesOtherthanManufacturingMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommonStockMember | $ 84.9 us-gaap_AvailableForSaleSecuritiesEquitySecurities / us-gaap_EquitySecuritiesByIndustryAxis = kmpr_AllIndustriesOtherthanManufacturingMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommonStockMember

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition This item represents the cost of equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments for other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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- Definition Amount of equity securities categorized neither as held-to-maturity nor as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 + Details
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