XML 80 R61.htm IDEA: XBRL DOCUMENT
v3.25.1

Long-Duration Insurance Contracts - Account Balances by Guaranteed Minimum Interest Rates (Details) $ in Millions | Mar. 31, 2025 USD ($) | Dec. 31, 2024 USD ($)
--- | --- | ---
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | $ 5,079.6 | $ 5,100.3
Less than 2% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | $ 778.4 | $ 797.6
Less than 2% | Maximum |  |
Policyholder Account Balance [Line Items] |  |
Policyholder account balance, guaranteed minimum credit rating | 2.00% | 2.00%
Equal to 2% but less than 3% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | $ 476.9 | $ 449.4
Equal to 2% but less than 3% | Minimum |  |
Policyholder Account Balance [Line Items] |  |
Policyholder account balance, guaranteed minimum credit rating | 2.00% | 2.00%
Equal to 2% but less than 3% | Maximum |  |
Policyholder Account Balance [Line Items] |  |
Policyholder account balance, guaranteed minimum credit rating | 3.00% | 3.00%
Equal to 3% but less than 4% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | $ 649.0 | $ 653.4
Equal to 3% but less than 4% | Minimum |  |
Policyholder Account Balance [Line Items] |  |
Policyholder account balance, guaranteed minimum credit rating | 3.00% | 3.00%
Equal to 3% but less than 4% | Maximum |  |
Policyholder Account Balance [Line Items] |  |
Policyholder account balance, guaranteed minimum credit rating | 4.00% | 4.00%
Equal to 4% but less than 5% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | $ 2,584.0 | $ 2,600.0
Equal to 4% but less than 5% | Minimum |  |
Policyholder Account Balance [Line Items] |  |
Policyholder account balance, guaranteed minimum credit rating | 4.00% | 4.00%
Equal to 4% but less than 5% | Maximum |  |
Policyholder Account Balance [Line Items] |  |
Policyholder account balance, guaranteed minimum credit rating | 5.00% | 5.00%
5% or higher |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | $ 81.0 | $ 81.8
5% or higher | Minimum |  |
Policyholder Account Balance [Line Items] |  |
Policyholder account balance, guaranteed minimum credit rating | 5.00% | 5.00%
Policyholder account balance with a guaranteed minimum crediting rate |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | $ 4,569.3 | $ 4,582.2
At Guaranteed Minimum | Less than 2% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | 11.2 | 15.9
At Guaranteed Minimum | Equal to 2% but less than 3% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | 82.5 | 94.5
At Guaranteed Minimum | Equal to 3% but less than 4% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | 571.6 | 545.6
At Guaranteed Minimum | Equal to 4% but less than 5% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | 2,584.0 | 2,600.0
At Guaranteed Minimum | 5% or higher |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | 81.0 | 81.8
At Guaranteed Minimum | Policyholder account balance with a guaranteed minimum crediting rate |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | $ 3,330.3 | $ 3,337.8
1-50 Basis Points Above | Minimum |  |
Policyholder Account Balance [Line Items] |  |
Policyholder account balance, above guaranteed minimum crediting rate | 0.0001 | 0.0001
1-50 Basis Points Above | Maximum |  |
Policyholder Account Balance [Line Items] |  |
Policyholder account balance, above guaranteed minimum crediting rate | 0.0050 | 0.0050
1-50 Basis Points Above | Less than 2% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | $ 24.6 | $ 77.3
1-50 Basis Points Above | Equal to 2% but less than 3% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | 129.9 | 122.2
1-50 Basis Points Above | Equal to 3% but less than 4% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | 11.7 | 43.3
1-50 Basis Points Above | Equal to 4% but less than 5% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | 0.0 | 0.0
1-50 Basis Points Above | 5% or higher |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | 0.0 | 0.0
1-50 Basis Points Above | Policyholder account balance with a guaranteed minimum crediting rate |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | $ 166.2 | $ 242.8
51-150 Basis Points Above | Minimum |  |
Policyholder Account Balance [Line Items] |  |
Policyholder account balance, above guaranteed minimum crediting rate | 0.0051 | 0.0051
51-150 Basis Points Above | Maximum |  |
Policyholder Account Balance [Line Items] |  |
Policyholder account balance, above guaranteed minimum crediting rate | 0.0150 | 0.0150
51-150 Basis Points Above | Less than 2% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | $ 375.2 | $ 400.4
51-150 Basis Points Above | Equal to 2% but less than 3% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | 117.9 | 97.9
51-150 Basis Points Above | Equal to 3% but less than 4% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | 13.7 | 13.3
51-150 Basis Points Above | Equal to 4% but less than 5% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | 0.0 | 0.0
51-150 Basis Points Above | 5% or higher |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | 0.0 | 0.0
51-150 Basis Points Above | Policyholder account balance with a guaranteed minimum crediting rate |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | $ 506.8 | $ 511.6
Greater Than 150 Basis Points Above | Minimum |  |
Policyholder Account Balance [Line Items] |  |
Policyholder account balance, above guaranteed minimum crediting rate | 0.0150 | 0.0150
Greater Than 150 Basis Points Above | Less than 2% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | $ 367.4 | $ 304.0
Greater Than 150 Basis Points Above | Equal to 2% but less than 3% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | 146.6 | 134.8
Greater Than 150 Basis Points Above | Equal to 3% but less than 4% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | 52.0 | 51.2
Greater Than 150 Basis Points Above | Equal to 4% but less than 5% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | 0.0 | 0.0
Greater Than 150 Basis Points Above | 5% or higher |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | 0.0 | 0.0
Greater Than 150 Basis Points Above | Policyholder account balance with a guaranteed minimum crediting rate |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | $ 566.0 | $ 490.0

X
- Definition Value above guaranteed minimum crediting rate on policyholder account balance. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29F -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29F Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-7A + Details
Name: | us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Guaranteed minimum crediting rate on policyholder account balance. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29F -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29F Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-7A + Details
Name: | us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditRating
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-7A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-7A Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-7A Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-7A Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-7A Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29F -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29F + Details
Name: | us-gaap_PolicyholderAccountBalanceLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount due to policyholder. Includes, but is not limited to, unpaid policy dividend, retrospective refund, and undistributed earnings on participating business. Excludes future policy benefit and claim expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-7A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-7A Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(14)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29F -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29F Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-7A + Details
Name: | us-gaap_PolicyholderFunds
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeAxis=hmn_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0000To0200Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeAxis=us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0200To0299Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeAxis=us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0300To0399Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeAxis=hmn_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0400To0499Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeAxis=hmn_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0500AndGreaterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeAxis=hmn_PolicyholderAccountBalanceWithAGuaranteedMinimumCreditingRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateAxis=us-gaap_PolicyholderAccountBalanceAtGuaranteedMinimumCreditingRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateAxis=us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0001To0050Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateAxis=us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0051To0150Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateAxis=us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0151AndGreaterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |