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Other Reinsurance Ceded Insurance (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Effects of Reinsurance [Line Items] |  |  |
Ceded to Other Companies | $ 26.0 us-gaap_CededPremiumsEarned | $ 33.9 us-gaap_CededPremiumsEarned | $ 42.5 us-gaap_CededPremiumsEarned
Catastrophe Reinsurance [Member] |  |  |
Effects of Reinsurance [Line Items] |  |  |
Ceded to Other Companies | $ 17.7 us-gaap_CededPremiumsEarned / us-gaap_ReinsurancePolicyTypeAxis = kmpr_CatastropheReinsuranceMember | $ 23.6 us-gaap_CededPremiumsEarned / us-gaap_ReinsurancePolicyTypeAxis = kmpr_CatastropheReinsuranceMember | $ 27.1 us-gaap_CededPremiumsEarned / us-gaap_ReinsurancePolicyTypeAxis = kmpr_CatastropheReinsuranceMember

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- Definition Amount of earned premiums ceded to other entities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.1) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b),(c)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1 -Article 7 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6486662&loc=d3e27175-158546 + Details
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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |