XML 64 R45.htm IDEA: XBRL DOCUMENT
v3.25.1

Fair Value of Financial Instruments - Financial Instruments Measured and Carried at Fair Value (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Financial Assets |  |
Total fixed maturity securities | $ 5,457.7 | $ 5,387.9
Equity securities | 64.3 | 66.5
Limited partnership interests (Carried under Fair Value Option, 2025 $34900000 and 2024, $28900000) | 1,125.6 | 1,121.3
Mortgage-backed securities |  |
Financial Assets |  |
Total fixed maturity securities | 812.2 | 755.8
Other, including U.S. Treasury securities |  |
Financial Assets |  |
Total fixed maturity securities | 363.3 | 357.6
Municipal bonds |  |
Financial Assets |  |
Total fixed maturity securities | 1,155.9 | 1,150.8
Foreign government bonds |  |
Financial Assets |  |
Total fixed maturity securities | 13.3 | 13.1
Corporate bonds |  |
Financial Assets |  |
Total fixed maturity securities | 1,779.9 | 1,782.4
Other asset-backed securities |  |
Financial Assets |  |
Total fixed maturity securities | 1,333.1 | 1,328.2
Recurring |  |
Financial Assets |  |
Limited partnership interests (Carried under Fair Value Option, 2025 $34900000 and 2024, $28900000) | 34.9 | 28.9
Recurring | Carrying Amount |  |
Financial Assets |  |
Total fixed maturity securities | 5,457.7 | 5,387.9
Equity securities | 64.3 | 66.5
Limited partnership interests (Carried under Fair Value Option, 2025 $34900000 and 2024, $28900000) | 34.9 | 28.9
Short-term investments | 126.0 | 101.1
Other investments | 13.8 | 18.5
Totals | 5,696.7 | 5,602.9
Separate Account (variable annuity) assets | 3,568.3 | 3,708.8
Financial Liabilities | 76.9 | 79.6
Recurring | Carrying Amount | Mortgage-backed securities |  |
Financial Assets |  |
Total fixed maturity securities | 812.2 | 755.8
Recurring | Carrying Amount | Other, including U.S. Treasury securities |  |
Financial Assets |  |
Total fixed maturity securities | 363.3 | 357.6
Recurring | Carrying Amount | Municipal bonds |  |
Financial Assets |  |
Total fixed maturity securities | 1,155.9 | 1,150.8
Recurring | Carrying Amount | Foreign government bonds |  |
Financial Assets |  |
Total fixed maturity securities | 13.3 | 13.1
Recurring | Carrying Amount | Corporate bonds |  |
Financial Assets |  |
Total fixed maturity securities | 1,780.0 | 1,782.4
Recurring | Carrying Amount | Other asset-backed securities |  |
Financial Assets |  |
Total fixed maturity securities | 1,333.0 | 1,328.2
Recurring | Fair Value |  |
Financial Assets |  |
Total fixed maturity securities | 5,457.7 | 5,387.9
Equity securities | 64.3 | 66.5
Limited partnership interests (Carried under Fair Value Option, 2025 $34900000 and 2024, $28900000) | 34.9 | 28.9
Short-term investments | 126.0 | 101.1
Other investments | 13.8 | 18.5
Totals | 5,696.7 | 5,602.9
Separate Account (variable annuity) assets | 3,568.3 | 3,708.8
Financial Liabilities | 76.9 | 79.6
Recurring | Fair Value | Mortgage-backed securities |  |
Financial Assets |  |
Total fixed maturity securities | 812.2 | 755.8
Recurring | Fair Value | Other, including U.S. Treasury securities |  |
Financial Assets |  |
Total fixed maturity securities | 363.3 | 357.6
Recurring | Fair Value | Municipal bonds |  |
Financial Assets |  |
Total fixed maturity securities | 1,155.9 | 1,150.8
Recurring | Fair Value | Foreign government bonds |  |
Financial Assets |  |
Total fixed maturity securities | 13.3 | 13.1
Recurring | Fair Value | Corporate bonds |  |
Financial Assets |  |
Total fixed maturity securities | 1,780.0 | 1,782.4
Recurring | Fair Value | Other asset-backed securities |  |
Financial Assets |  |
Total fixed maturity securities | 1,333.0 | 1,328.2
Recurring | Fair Value | Level 1 |  |
Financial Assets |  |
Total fixed maturity securities | 32.5 | 32.4
Equity securities | 1.3 | 1.4
Limited partnership interests (Carried under Fair Value Option, 2025 $34900000 and 2024, $28900000) | 0.0 | 0.0
Short-term investments | 126.0 | 101.1
Other investments | 0.0 | 0.0
Totals | 159.8 | 134.9
Separate Account (variable annuity) assets | 3,568.3 | 3,708.8
Financial Liabilities | 0.0 | 0.0
Recurring | Fair Value | Level 1 | Mortgage-backed securities |  |
Financial Assets |  |
Total fixed maturity securities | 0.0 | 0.0
Recurring | Fair Value | Level 1 | Other, including U.S. Treasury securities |  |
Financial Assets |  |
Total fixed maturity securities | 24.8 | 24.7
Recurring | Fair Value | Level 1 | Municipal bonds |  |
Financial Assets |  |
Total fixed maturity securities | 0.0 | 0.0
Recurring | Fair Value | Level 1 | Foreign government bonds |  |
Financial Assets |  |
Total fixed maturity securities | 0.0 | 0.0
Recurring | Fair Value | Level 1 | Corporate bonds |  |
Financial Assets |  |
Total fixed maturity securities | 7.7 | 7.7
Recurring | Fair Value | Level 1 | Other asset-backed securities |  |
Financial Assets |  |
Total fixed maturity securities | 0.0 | 0.0
Recurring | Fair Value | Level 2 |  |
Financial Assets |  |
Total fixed maturity securities | 4,941.0 | 4,855.6
Equity securities | 59.0 | 60.9
Limited partnership interests (Carried under Fair Value Option, 2025 $34900000 and 2024, $28900000) | 0.0 | 0.0
Short-term investments | 0.0 | 0.0
Other investments | 13.8 | 18.5
Totals | 5,013.8 | 4,935.0
Separate Account (variable annuity) assets | 0.0 | 0.0
Financial Liabilities | 2.6 | 4.1
Recurring | Fair Value | Level 2 | Mortgage-backed securities |  |
Financial Assets |  |
Total fixed maturity securities | 812.2 | 755.8
Recurring | Fair Value | Level 2 | Other, including U.S. Treasury securities |  |
Financial Assets |  |
Total fixed maturity securities | 338.5 | 332.9
Recurring | Fair Value | Level 2 | Municipal bonds |  |
Financial Assets |  |
Total fixed maturity securities | 1,079.8 | 1,075.9
Recurring | Fair Value | Level 2 | Foreign government bonds |  |
Financial Assets |  |
Total fixed maturity securities | 13.3 | 13.1
Recurring | Fair Value | Level 2 | Corporate bonds |  |
Financial Assets |  |
Total fixed maturity securities | 1,431.3 | 1,423.4
Recurring | Fair Value | Level 2 | Other asset-backed securities |  |
Financial Assets |  |
Total fixed maturity securities | 1,265.9 | 1,254.5
Recurring | Fair Value | Level 3 |  |
Financial Assets |  |
Total fixed maturity securities | 484.1 | 499.9
Equity securities | 4.0 | 4.2
Limited partnership interests (Carried under Fair Value Option, 2025 $34900000 and 2024, $28900000) | 34.9 | 28.9
Short-term investments | 0.0 | 0.0
Other investments | 0.0 | 0.0
Totals | 523.0 | 533.0
Separate Account (variable annuity) assets | 0.0 | 0.0
Financial Liabilities | 74.3 | 75.5
Recurring | Fair Value | Level 3 | External |  |
Financial Assets |  |
Total fixed maturity securities | 294.1 | 300.6
Equity securities | 4.0 | 4.2
Limited partnership interests (Carried under Fair Value Option, 2025 $34900000 and 2024, $28900000) | 34.9 | 28.9
Financial Liabilities | 0.0 | 0.0
Recurring | Fair Value | Level 3 | Mortgage-backed securities |  |
Financial Assets |  |
Total fixed maturity securities | 0.0 | 0.0
Recurring | Fair Value | Level 3 | Mortgage-backed securities | External |  |
Financial Assets |  |
Total fixed maturity securities | 0.0 | 0.0
Recurring | Fair Value | Level 3 | Other, including U.S. Treasury securities |  |
Financial Assets |  |
Total fixed maturity securities | 0.0 | 0.0
Recurring | Fair Value | Level 3 | Municipal bonds |  |
Financial Assets |  |
Total fixed maturity securities | 76.1 | 74.9
Recurring | Fair Value | Level 3 | Municipal bonds | External |  |
Financial Assets |  |
Total fixed maturity securities | 76.1 | 74.9
Recurring | Fair Value | Level 3 | Foreign government bonds |  |
Financial Assets |  |
Total fixed maturity securities | 0.0 | 0.0
Recurring | Fair Value | Level 3 | Corporate bonds |  |
Financial Assets |  |
Total fixed maturity securities | 340.9 | 351.3
Recurring | Fair Value | Level 3 | Corporate bonds | External |  |
Financial Assets |  |
Total fixed maturity securities | 150.9 | 152.0
Recurring | Fair Value | Level 3 | Other asset-backed securities |  |
Financial Assets |  |
Total fixed maturity securities | 67.1 | 73.7
Recurring | Fair Value | Level 3 | Other asset-backed securities | External |  |
Financial Assets |  |
Total fixed maturity securities | $ 67.1 | $ 73.7

X
- Definition Other Investment, Fair Value Disclosure + References No definition available. + Details
Name: | hmn_OtherInvestmentFairValueDisclosure
Namespace Prefix: | hmn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterestCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483467/210-10-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482736/825-10-45-1A + Details
Name: | us-gaap_EquitySecuritiesFvNi
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2E -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_FinancialLiabilitiesFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2E -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_InvestmentsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investment in equity method investee and investment in and advance to affiliate. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(18)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value amount of the specified investment category of assets maintained in separate accounts as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 944 -SubTopic 80 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480109/944-80-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 944 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 15 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479808/944-20-55-15 + Details
Name: | us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(5)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(8)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_ShortTermInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=hmn_OtherIncludingUsTreasurySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_MunicipalBondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_ForeignGovernmentDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_MortgageBackedSecuritiesOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByMeasurementBasisAxis=us-gaap_CarryingReportedAmountFairValueDisclosureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByMeasurementBasisAxis=us-gaap_EstimateOfFairValueFairValueDisclosureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | hmn_FairValuePricingSourceAxis=hmn_ExternalPricingSourceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |