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Segment Information - Narrative (Details) | 12 Months Ended
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Dec. 31, 2023 segment
Segment Reporting [Abstract] |
Number of reportable segments (in segments) | 4
Number of reportable segments that represent major lines of business | 3

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- Definition Number Of Reportable Segments That Represent Major Lines Of Business + References No definition available. + Details
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Namespace Prefix: | hmn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-18 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration