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Unpaid Claims and Claim Expenses - Narrative (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Sep. 30, 2021
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Insurance Loss Reserves [Abstract] |  |
Favorable development of total reserves for property and casualty claims occurring in prior years | $ 8.0 | $ 7.2

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- Definition Favorable Development Of Total Reserves For Property And Casualty Claims Occurring In Prior Years + References No definition available. + Details
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Namespace Prefix: | hmn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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