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Segment Information (Details Textual)	12 Months Ended
	Dec. 31, 2012 Segment
Segment Information (Textual) [Abstract]
Business segments	4
Period within which debt retirement costs/gains have been included in the corporate and other segment, in addition to certain ongoing transactions	10 years

X

- Definition

Company's business segments.

+ References

No definition available.

+ Details

Name:	hmn_BusinessSegments
Namespace Prefix:	hmn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Period within which debt retirement costs/gains have been included in the corporate and other segment, in addition to certain ongoing transactions.

+ References

No definition available.

+ Details

Name:	hmn_DebtRetirementCostsGainsIncludedInCorpOtherPeriod
Namespace Prefix:	hmn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	hmn_SegmentInformationTextualAbstract
Namespace Prefix:	hmn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration