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Income From Investments - Net Realized Gains on Sales of Investments (Details) (USD $) In Millions, 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
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Realized Investment Gains |  |  |  |  |  |  |  |  | $ 41.7 kmpr_RealizedInvestmentGains | $ 99.5 kmpr_RealizedInvestmentGains | $ 65.4 kmpr_RealizedInvestmentGains
Realized Investment Losses |  |  |  |  |  |  |  |  | (2.5)kmpr_RealizedInvestmentLosses | (1.0)kmpr_RealizedInvestmentLosses | (0.3)kmpr_RealizedInvestmentLosses
Gain on Sale of Subsidiary |  |  |  |  |  |  |  |  | 1.6 kmpr_RealizedGainLossonDisposalofSubsidiary | 0 kmpr_RealizedGainLossonDisposalofSubsidiary | 0 kmpr_RealizedGainLossonDisposalofSubsidiary
Trading Securities, Realized Gain (Loss) |  |  |  |  |  |  |  |  | (0.1)us-gaap_TradingSecuritiesRealizedGainLoss | 0.6 us-gaap_TradingSecuritiesRealizedGainLoss | 0.3 us-gaap_TradingSecuritiesRealizedGainLoss
Net Realized Gains (Losses) 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
Fixed Maturities [Member] |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gains on Sales |  |  |  |  |  |  |  |  | 7.0 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember | 30.9 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember | 56.9 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember
Losses on Sales |  |  |  |  |  |  |  |  | (0.2)us-gaap_AvailableforsaleSecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember | (0.4)us-gaap_AvailableforsaleSecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember | (0.1)us-gaap_AvailableforsaleSecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember
Equity Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gains on Sales |  |  |  |  |  |  |  |  | 33.1 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember | 21.8 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember | 8.3 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember
Losses on Sales |  |  |  |  |  |  |  |  | (2.0)us-gaap_AvailableforsaleSecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember | (0.5)us-gaap_AvailableforsaleSecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember | (0.2)us-gaap_AvailableforsaleSecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember
Investee [Member] |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity Method Limited Liability Investment, Gains on Sales |  |  |  |  |  |  |  |  | 0 us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal / us-gaap_InvestmentTypeAxis = us-gaap_InvesteeMember | 2.5 us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal / us-gaap_InvestmentTypeAxis = us-gaap_InvesteeMember | 0 us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal / us-gaap_InvestmentTypeAxis = us-gaap_InvesteeMember
Real Estate Investment [Member] |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Realized Investment Gains |  |  |  |  |  |  |  |  | 0 kmpr_RealizedInvestmentGains / us-gaap_InvestmentTypeAxis = us-gaap_RealEstateInvestmentMember | 44.2 kmpr_RealizedInvestmentGains / us-gaap_InvestmentTypeAxis = us-gaap_RealEstateInvestmentMember | 0.2 kmpr_RealizedInvestmentGains / us-gaap_InvestmentTypeAxis = us-gaap_RealEstateInvestmentMember
Realized Investment Losses |  |  |  |  |  |  |  |  | (0.2)kmpr_RealizedInvestmentLosses / us-gaap_InvestmentTypeAxis = us-gaap_RealEstateInvestmentMember | 0 kmpr_RealizedInvestmentLosses / us-gaap_InvestmentTypeAxis = us-gaap_RealEstateInvestmentMember | 0 kmpr_RealizedInvestmentLosses / us-gaap_InvestmentTypeAxis = us-gaap_RealEstateInvestmentMember
Other Investment [Member] |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Realized Investment Gains |  |  |  |  |  |  |  |  | 0 kmpr_RealizedInvestmentGains / us-gaap_InvestmentTypeAxis = kmpr_OtherInvestmentMember | 0.1 kmpr_RealizedInvestmentGains / us-gaap_InvestmentTypeAxis = kmpr_OtherInvestmentMember | 0 kmpr_RealizedInvestmentGains / us-gaap_InvestmentTypeAxis = kmpr_OtherInvestmentMember
Realized Investment Losses |  |  |  |  |  |  |  |  | $ (0.1)kmpr_RealizedInvestmentLosses / us-gaap_InvestmentTypeAxis = kmpr_OtherInvestmentMember | $ (0.1)kmpr_RealizedInvestmentLosses / us-gaap_InvestmentTypeAxis = kmpr_OtherInvestmentMember | $ 0 kmpr_RealizedInvestmentLosses / us-gaap_InvestmentTypeAxis = kmpr_OtherInvestmentMember

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- Definition Realized Gain (Loss) on Disposal of Subsidiary + References No definition available. + Details
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- Definition The net realized gains on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity + References No definition available. + Details
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- Definition The net realized losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity + References No definition available. + Details
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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities and excluding other than temporary impairments (OTTI), if any, recognized elsewhere. + References No definition available. + Details
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- Definition Amount of gain (loss) on sale or disposal of an equity method investment. + References No definition available. + Details
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- Definition This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph ((b)(7)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition This item represents the gain (loss) realized during the period from the sale of trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph c -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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