XML 60 R49.htm IDEA: XBRL DOCUMENT
v3.25.2

Business Segments - Earned Premiums by Product Line (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Segment Reporting Information [Line Items] |  |  |  |  |
Remeasurement gain | [1] | $ 1,130.8 | $ 1,033.7 | $ 2,218.7 | $ 2,065.6
Life Insurance |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Remeasurement gain |  | (0.9) | (0.9) | (0.7) | (0.7)
Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Remeasurement gain |  | 1,111.3 | 963.4 | 2,173.2 | 1,900.7
Operating Segments | Specialty Property & Casualty Insurance |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Remeasurement gain |  | 1,010.8 | 862.6 | 1,973.0 | 1,702.6
Operating Segments | Life Insurance |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Remeasurement gain |  | 100.5 | 100.8 | 200.2 | 198.1
Operating Segments | Personal Automobile | Specialty Property & Casualty Insurance |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Remeasurement gain |  | 789.3 | 691.5 | 1,543.0 | 1,366.8
Operating Segments | Commercial Automobile | Specialty Property & Casualty Insurance |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Remeasurement gain |  | 221.5 | 171.1 | 430.0 | 335.8
Operating Segments | Life | Life Insurance |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Remeasurement gain |  | 84.8 | 84.4 | 168.5 | 165.0
Operating Segments | Accident and Health | Life Insurance |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Remeasurement gain |  | 5.4 | 5.6 | 10.9 | 11.2
Operating Segments | Property | Life Insurance |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Remeasurement gain |  | 10.3 | 10.8 | 20.8 | 21.9
Non-Core Operations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Remeasurement gain |  | $ 19.5 | $ 70.3 | $ 45.5 | $ 164.9
[1] | 1 Includes a remeasurement loss related to the deferred profit liability within the Life insurance business of $0.9 million for the three months ended June 30, 2025 and 2024, and a remeasurement loss of $0.7 million for the six months ended June 30, 2025 and 2024.

X
- Definition Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 55 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477548/944-605-55-14 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 55 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477548/944-605-55-11 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 55 -Paragraph 15 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477548/944-605-55-15 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477548/944-605-55-12 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479838/944-20-50-1 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 55 -Paragraph 11 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477548/944-605-55-11 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 235 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17(Column E)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477965/944-235-S99-2 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479032/944-605-50-1 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)(c)) -SubTopic 220 -Topic 942 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(1)) -SubTopic 220 -Topic 944 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 + Details
Name: | us-gaap_PremiumsEarnedNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=kmpr_LifeInsuranceSegment1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidationItemsAxis=us-gaap_OperatingSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=kmpr_SpecialtyPropertyCasualtyInsuranceSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=kmpr_SpecialtyAutomobileMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=kmpr_CommercialAutomobileMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=kmpr_LifeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=kmpr_AccidentalandHealthMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=kmpr_PropertyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidationItemsAxis=us-gaap_MaterialReconcilingItemsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |