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v2.4.0.8

Relationships with Mutual Insurance Companies (Details) | 9 Months Ended
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Sep. 30, 2013 employees director
Capitol [Member] |
Relationships with Mutual Insurance Companies [Line Items] |
Number of Board of Director Members | 5
Number of Company Employee Board Members | 5
ORCC [Member] |
Relationships with Mutual Insurance Companies [Line Items] |
Number of Board of Director Members | 9
Number of Company Employee Board Members | 9
Capitol [Member] | Trinity [Member] |
Relationships with Mutual Insurance Companies [Line Items] |
Assumed Premiums, Other Insurance Percentage | 100.00%
ORCC [Member] | Trinity [Member] |
Relationships with Mutual Insurance Companies [Line Items] |
Assumed Premiums, Other Insurance Percentage | 100.00%

X
- Definition Premiums assumed for all other insurance from other insurers as a result of reinsurance arrangements, percentage. + References No definition available. + Details
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Namespace Prefix: | kmpr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Board of Director Members + References No definition available. + Details
Name: | kmpr_NumberOfBoardOfDirectorMembers
Namespace Prefix: | kmpr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Company Employee Board Members + References No definition available. + Details
Name: | kmpr_NumberOfCompanyEmployeeBoardMembers
Namespace Prefix: | kmpr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | kmpr_RelationshipsWithMutualInsuranceCompaniesLineItems
Namespace Prefix: | kmpr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration