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Unpaid Claims and Claim Expenses - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Segment Reporting Information |  |  |
Automobile liability coverage percent reserves | 74.00% |  |
Short tail coverage reserves as a percentage of total reserves | 26.00% |  |
Long tail coverage reserves as percentage of reserves | 74.00% |  |
Percentage of losses incurred | 99.00% |  |
Potential variability of property and casualty loss reserves | 6.00% |  |
Probability of other possible outcomes possible impact on net income | $ 12.0 |  |
Favorable development of total reserves for property and casualty claims occurring in prior years | 7.2 | $ 10.2 | $ 7.5
2018 Camp Fire In California |  |  |
Segment Reporting Information |  |  |
Favorable development of total reserves for property and casualty claims occurring in prior years | $ 4.8 |  |

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- Definition Automobile liability coverage reserves as a percentage of total reserves. + References No definition available. + Details
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Namespace Prefix: | hmn_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The reduction in the estimate of the amount needed to settle claims relating to property and casualty insured events that have occurred in prior years. + References No definition available. + Details
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X
- Definition Long tail coverage reserves as a percentage of total reserves. + References No definition available. + Details
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Namespace Prefix: | hmn_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The percentage of losses represented by auto liability and auto physical damage. + References No definition available. + Details
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Namespace Prefix: | hmn_
Data Type: | dtr-types:percentItemType
Balance Type: | na
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X
- Definition Potential percentage variability (plus or minus) of property and casualty loss reserves within a reasonable probability of other possible outcomes. + References No definition available. + Details
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- Definition Equated Net Income impact (plus or minus) of potential percentage variability (plus or minus) of property and casualty loss reserves within a reasonable probability of other possible outcomes. + References No definition available. + Details
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Namespace Prefix: | hmn_
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Balance Type: | credit
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- Definition Short Tail Coverage Reserves As A Percentage Of Total Reserves. + References No definition available. + Details
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Namespace Prefix: | hmn_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- 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
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- Details
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Period Type: |