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Relationships with Mutual Insurance Companies (Details)	6 Months Ended
	Jun. 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

Name:	kmpr_AssumedPremiumsOtherInsurancePercentage
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