XML 74 R63.htm IDEA: XBRL DOCUMENT
v3.20.2

Pension Benefits and Postretirement Benefits Other Than Pensions - Narrative (Details) | 6 Months Ended
--- | ---
Jun. 30, 2020 employees
Pension Plans |
Defined Benefit Plan Disclosure [Line Items] |
Number of participants and beneficiaries | 8,510
Number of active employees | 1,040
Postretirement Benefits Other than Pensions |
Defined Benefit Plan Disclosure [Line Items] |
Number of retired employees covered | 650
Number of active employees covered | 520

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 Defined Benefit Pension Plans, Number of Active Employees + References No definition available. + Details
Name: | kmpr_DefinedBenefitPensionPlansNumberOfActiveEmployees
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 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: |