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Income Taxes - Comprehensive Income Tax Benefit and Expense (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
Income Tax Benefit (Expense) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income Tax Expense | $ (29.8)us-gaap_IncomeTaxExpenseBenefit | $ 0.8 us-gaap_IncomeTaxExpenseBenefit | $ (1.9)us-gaap_IncomeTaxExpenseBenefit | $ (16.7)us-gaap_IncomeTaxExpenseBenefit | $ (26.6)us-gaap_IncomeTaxExpenseBenefit | $ (33.4)us-gaap_IncomeTaxExpenseBenefit | $ (13.9)us-gaap_IncomeTaxExpenseBenefit | $ (26.0)us-gaap_IncomeTaxExpenseBenefit | $ (47.6)us-gaap_IncomeTaxExpenseBenefit | $ (99.9)us-gaap_IncomeTaxExpenseBenefit | $ (30.6)us-gaap_IncomeTaxExpenseBenefit
Income Tax Expense - Discontinued Operations |  |  |  |  |  |  |  |  | (1.1)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation | (1.7)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation | (7.3)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
Unrealized Appreciation on Securities |  |  |  |  |  |  |  |  | (82.8)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax | 129.1 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax | (34.4)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax
Foreign Currency Translation Adjustments on Investments |  |  |  |  |  |  |  |  | 0.4 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax | (0.1)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax | (0.6)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax
Tax Effects from Postretirement Benefit Plans |  |  |  |  |  |  |  |  | 34.7 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax | (30.4)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax | 4.6 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax
Tax Effects from Long-Term Equity-based Compensation included in Pain-in Capital |  |  |  |  |  |  |  |  | (1.0)us-gaap_IncomeTaxEffectsAllocatedDirectlyToEquityEquityTransactions | 0.2 us-gaap_IncomeTaxEffectsAllocatedDirectlyToEquityEquityTransactions | (0.1)us-gaap_IncomeTaxEffectsAllocatedDirectlyToEquityEquityTransactions
Comprehensive Income Tax Expense |  |  |  |  |  |  |  |  | $ 97.4 kmpr_ComprehensiveIncomeLossTax | $ 2.8 kmpr_ComprehensiveIncomeLossTax | $ 68.4 kmpr_ComprehensiveIncomeLossTax

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- Definition Comprehensive Income (Loss), Tax + References No definition available. + Details
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- Definition Tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items. Includes the tax effects of the following: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b),(c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32672-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=18498875&loc=d3e38679-109324 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 + Details
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- Definition The tax effect of an increase or decrease in contributed capital (for example, deductible expenditures reported as a reduction of the proceeds from issuing capital stock) during the period charged or credited directly to shareholders' equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 11 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=18498875&loc=d3e39076-109324 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition Amount of tax expense (benefit), after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e640-108580 + Details
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- Definition Amount of tax expense (benefit), after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e640-108580 + Details
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- Definition Amount of tax (expense) benefit, after reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e640-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 + Details
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