XML 80 R69.htm IDEA: XBRL DOCUMENT
v3.21.2

Pension Benefits and Postretirement Benefits Other Than Pensions - Narrative (Details) - employees | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2021
Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Number of participants and beneficiaries | 3,145 |
Percentage of Compensation, Defined Benefit Plan Employee Contribution |  | 3.00%
Postretirement Benefits Other than Pensions |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Number of retired employees covered | 575 |
Number of active employees covered | 500 |

X
- Definition Defined Benefit Pension Plan, Number of Participants and Beneficiaries + References No definition available. + Details
Name: | kmpr_DefinedBenefitPensionPlanNumberofParticipantsandBeneficiaries
Namespace Prefix: | kmpr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Other Postretirement Benefit Plan, Number of Active Employees Covered + References No definition available. + Details
Name: | kmpr_OtherPostretirementBenefitPlanNumberOfActiveEmployeesCovered
Namespace Prefix: | kmpr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Other Postretirement Benefit Plan, Number of Retired Employees Covered + References No definition available. + Details
Name: | kmpr_OtherPostretirementBenefitPlanNumberOfRetiredEmployeesCovered
Namespace Prefix: | kmpr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of Compensation, Defined Benefit Plan Employee Contribution + References No definition available. + Details
Name: | kmpr_PercentageOfCompensationDefinedBenefitPlanEmployeeContribution
Namespace Prefix: | kmpr_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |