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Insurance Expenses (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
Insurance Expenses [Abstract] |  |  |  |  |  |  |  |  |  |  |
Commissions |  |  |  |  |  |  |  |  | $ 324.6 us-gaap_InsuranceCommissions | $ 345.7 us-gaap_InsuranceCommissions | $ 366.1 us-gaap_InsuranceCommissions
General Expenses |  |  |  |  |  |  |  |  | 258.1 us-gaap_OtherUnderwritingExpense | 257.1 us-gaap_OtherUnderwritingExpense | 262.9 us-gaap_OtherUnderwritingExpense
Taxes, Licenses and Fees |  |  |  |  |  |  |  |  | 38.9 kmpr_InsuranceTaxLicensesAndFees | 42.8 kmpr_InsuranceTaxLicensesAndFees | 44.7 kmpr_InsuranceTaxLicensesAndFees
Total Costs Incurred |  |  |  |  |  |  |  |  | 621.6 kmpr_TotalIncurredCostsInsurance | 645.6 kmpr_TotalIncurredCostsInsurance | 673.7 kmpr_TotalIncurredCostsInsurance
Policy Acquisition Costs: |  |  |  |  |  |  |  |  |  |  |
Deferred |  |  |  |  |  |  |  |  | (235.8)us-gaap_DeferredPolicyAcquisitionCostsAdditions | (253.4)us-gaap_DeferredPolicyAcquisitionCostsAdditions | (266.4)us-gaap_DeferredPolicyAcquisitionCostsAdditions
Amortized |  |  |  |  |  |  |  |  | 235.4 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense | 253.9 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense | 257.0 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense
Net Policy Acquisition Costs Amortized (Deferred) |  |  |  |  |  |  |  |  | (0.4)us-gaap_DeferredPolicyAcquisitionCostsPeriodIncreaseDecrease | 0.5 us-gaap_DeferredPolicyAcquisitionCostsPeriodIncreaseDecrease | (9.4)us-gaap_DeferredPolicyAcquisitionCostsPeriodIncreaseDecrease
Life VIF and P&C Customer Relationships Amortized |  |  |  |  |  |  |  |  | 7.2 kmpr_AmortizationOfValueOfBusinessAcquiredAndCustomerRelationshipsAcquired | 8.3 kmpr_AmortizationOfValueOfBusinessAcquiredAndCustomerRelationshipsAcquired | 8.0 kmpr_AmortizationOfValueOfBusinessAcquiredAndCustomerRelationshipsAcquired
Insurance Expenses | $ 156.4 us-gaap_OtherExpenses | $ 158.6 us-gaap_OtherExpenses | $ 161.3 us-gaap_OtherExpenses | $ 152.1 us-gaap_OtherExpenses | $ 162.9 us-gaap_OtherExpenses | $ 170.1 us-gaap_OtherExpenses | $ 163.1 us-gaap_OtherExpenses | $ 158.3 us-gaap_OtherExpenses | $ 628.4 us-gaap_OtherExpenses | $ 654.4 us-gaap_OtherExpenses | $ 672.3 us-gaap_OtherExpenses

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- Definition Amortization of Value of Business Acquired and Customer Relationships Acquired + References No definition available. + Details
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- Details
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- Definition Represents total insurance tax, license, and fee expense + References No definition available. + Details
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- Definition Total Incurred Costs, Insurance + References No definition available. + Details
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- Definition Amount of expense related to deferred policy acquisition costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.7(a)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 7 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 18 -Article 12 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35755530&loc=d3e11264-158415 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 35 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28247317&loc=d3e10157-158409 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6480726&loc=d3e6691-158385 + Details
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- Definition Total amount of policy acquisition costs capitalized during the income statement period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35755530&loc=d3e11264-158415 + Details
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- Definition Total net Increase or Decrease in changes to deferred policy acquisition costs due to one or more transactions, including amortization of costs and modifications or internal replacements of existing insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755530&loc=d3e11264-158415 + Details
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- Definition The expense incurred by an insurance company to persons or entities for generating or placing insurance or investment contracts with the company, usually determined as a percentage of policy or contract premiums. Excludes advances or draws to be applied against commissions earned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.7(a)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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- Definition This element represents a sum total of expenses not separately reflected on the income statement for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 7 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.7) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4,6) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Costs incurred during the period, such as those relating to general administration and policy maintenance that do not vary with and are not primarily related to the acquisition or renewal of insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 7 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.7) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 720 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35755714&loc=d3e28434-158551 + Details
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