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Business Segments - Amortization of Deferred Policy Acquisitions Costs By Segment (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |
Amortization of Deferred Policy Acquisition Costs | $ 235.4 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense | $ 253.9 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense | $ 257.0 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense
Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Amortization of Deferred Policy Acquisition Costs | 235.4 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember | 253.9 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember | 257.0 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember
Property and Casualty Insurance [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Amortization of Deferred Policy Acquisition Costs | 187.5 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = kmpr_PropertyAndCasualtyInsuranceMember | 207.2 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = kmpr_PropertyAndCasualtyInsuranceMember | 212.6 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = kmpr_PropertyAndCasualtyInsuranceMember
Life and Health Insurance [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Amortization of Deferred Policy Acquisition Costs | $ 47.9 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = kmpr_LifeAndHealthInsuranceMember | $ 46.7 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = kmpr_LifeAndHealthInsuranceMember | $ 44.4 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = kmpr_LifeAndHealthInsuranceMember

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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
Name: | us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=kmpr_LifeAndHealthInsuranceMember
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Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=kmpr_PropertyAndCasualtyInsuranceMember
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Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Data Type: | na
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