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Summary Of Accounting Policies And Accounting Changes (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Accounting Policy Disclosures [Line Items] |  |  |  |  |  |  |
Interest rate assumption, minimum |  |  |  |  | 3.00%us-gaap_TraditionalLifeInterestRateLowEnd |  |
Interest rate assumption, maximum |  |  |  |  | 7.00%us-gaap_TraditionalLifeInterestRateHighEnd |  |
Write-off of long-lived asset | $ 0 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse | $ 54.6 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse | $ 0 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse | $ 0 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse | $ 54.6 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse | $ 0 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse | $ 0 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Charge for goodwill impairment included in insurance expenses |  |  |  |  |  | 1.4 us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill |
Life Insurance Product Line [Member] |  |  |  |  |  |  |
Accounting Policy Disclosures [Line Items] |  |  |  |  |  |  |
Present value of the future profits embedded in life insurance in force | 36.5 us-gaap_ValueOfBusinessAcquiredVOBA / us-gaap_ProductOrServiceAxis = us-gaap_LifeInsuranceSegmentMember |  |  |  | 36.5 us-gaap_ValueOfBusinessAcquiredVOBA / us-gaap_ProductOrServiceAxis = us-gaap_LifeInsuranceSegmentMember | 41.2 us-gaap_ValueOfBusinessAcquiredVOBA / us-gaap_ProductOrServiceAxis = us-gaap_LifeInsuranceSegmentMember |
Expected Amortization Expense of Ending Present Value of Future Insurance Profits, Net of Interest Accrued [Abstract] |  |  |  |  |  |  |
2015 |  |  |  |  | 4.2 us-gaap_ExpectedAmortizationExpenseOfEndingPresentValueOfFutureInsuranceProfitsYearOne / us-gaap_ProductOrServiceAxis = us-gaap_LifeInsuranceSegmentMember |  |
2016 |  |  |  |  | 3.7 us-gaap_ExpectedAmortizationExpenseOfEndingPresentValueOfFutureInsuranceProfitsYearTwo / us-gaap_ProductOrServiceAxis = us-gaap_LifeInsuranceSegmentMember |  |
2017 |  |  |  |  | 3.2 us-gaap_ExpectedAmortizationExpenseOfEndingPresentValueOfFutureInsuranceProfitsYearThree / us-gaap_ProductOrServiceAxis = us-gaap_LifeInsuranceSegmentMember |  |
2018 |  |  |  |  | 2.9 us-gaap_ExpectedAmortizationExpenseOfEndingPresentValueOfFutureInsuranceProfitsYearFour / us-gaap_ProductOrServiceAxis = us-gaap_LifeInsuranceSegmentMember |  |
2019 |  |  |  |  | 2.4 us-gaap_ExpectedAmortizationExpenseOfEndingPresentValueOfFutureInsuranceProfitsYearFive / us-gaap_ProductOrServiceAxis = us-gaap_LifeInsuranceSegmentMember |  |
Property and Casualty Insurance [Member] |  |  |  |  |  |  |
Accounting Policy Disclosures [Line Items] |  |  |  |  |  |  |
Present value of the future profits embedded in life insurance in force | $ 13.3 us-gaap_ValueOfBusinessAcquiredVOBA / us-gaap_ProductOrServiceAxis = kmpr_PropertyAndCasualtyInsuranceMember |  |  |  | $ 13.3 us-gaap_ValueOfBusinessAcquiredVOBA / us-gaap_ProductOrServiceAxis = kmpr_PropertyAndCasualtyInsuranceMember | $ 15.8 us-gaap_ValueOfBusinessAcquiredVOBA / us-gaap_ProductOrServiceAxis = kmpr_PropertyAndCasualtyInsuranceMember |

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- Definition Expected amortization expense in the fifth year after the balance sheet date of the present value of the future profits of long-duration contracts acquired in a purchase of an insurance enterprise. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section S99 -Paragraph 2 -Subparagraph (3) -URI http://asc.fasb.org/extlink&oid=27015749&loc=d3e569990-122904 + Details
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- Definition Expected amortization expense in the fourth year after the balance sheet date of the present value of the future profits of long-duration contracts acquired in a purchase of an insurance enterprise. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section S99 -Paragraph 2 -Subparagraph (3) -URI http://asc.fasb.org/extlink&oid=27015749&loc=d3e569990-122904 + Details
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- Definition Expected amortization expense in the first year after the balance sheet date of the present value of the future profits of long-duration contracts acquired in a purchase of an insurance enterprise. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section S99 -Paragraph 2 -Subparagraph (3) -URI http://asc.fasb.org/extlink&oid=27015749&loc=d3e569990-122904 + Details
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- Definition Expected amortization expense in the third year after the balance sheet date of the present value of the future profits of long-duration contracts acquired in a purchase of an insurance enterprise. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section S99 -Paragraph 2 -Subparagraph (3) -URI http://asc.fasb.org/extlink&oid=27015749&loc=d3e569990-122904 + Details
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- Definition Expected amortization expense in the second year after the balance sheet date of the present value of the future profits of long-duration contracts acquired in a purchase of an insurance enterprise. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section S99 -Paragraph 2 -Subparagraph (3) -URI http://asc.fasb.org/extlink&oid=27015749&loc=d3e569990-122904 + Details
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- Definition Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275 + Details
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- Definition The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 225 -Section 45 -Paragraph 11 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28367520&loc=d3e92212-112881 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Impairment -URI http://asc.fasb.org/extlink&oid=6515133 + Details
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- Definition Maximum interest rate for traditional life contracts in the range of interest rates used to calculate future benefits to be paid to or on behalf of policyholders and related expenses less the present value of future net premiums using assumptions such as estimates of expected investment yields, mortality, morbidity, terminations and expenses, applicable at the time the insurance contracts are made and costs of settling insured claims and costs incurred in the claims settlement process of traditional life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph b -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.13(b)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6482852&loc=d3e14931-158439 + Details
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- Definition Minimum interest rate for traditional life contracts in the range of interest rates used to calculate future benefits to be paid to or on behalf of policyholders and related expenses less the present value of future net premiums using assumptions such as estimates of expected investment yields, mortality, morbidity, terminations and expenses, applicable at the time the insurance contracts are made and costs of settling insured claims and costs incurred in the claims settlement process of traditional life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph b -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6482852&loc=d3e14931-158439 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),13(b)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition The remaining unamortized carrying amount as of the balance sheet date of expected future earnings from insurance contracts acquired (also known as present value of future profits). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.10) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section S99 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27015749&loc=d3e569990-122904 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Article 7 + Details
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