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Shareholders' Equity and Common Stock Equivalents (Details)
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Summary of stock units and stock options outstanding under the Comprehensive Plan      
Stock options 634,437us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 956,814us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 1,882,939us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Restricted common stock units related to incentive compensation 1,590,138us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber 1,663,190us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber 1,423,611us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Total 2,382,166hmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardsEquityInstrumentsOutstanding 2,850,047hmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardsEquityInstrumentsOutstanding 3,534,652hmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardsEquityInstrumentsOutstanding
Employee Stock Option [Member]      
Summary of stock units and stock options outstanding under the Comprehensive Plan      
Common stock units related to deferred compensation 69,598hmn_DeferredCompensationArrangementWithIndividualSharesOutstanding
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 111,981hmn_DeferredCompensationArrangementWithIndividualSharesOutstanding
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 116,174hmn_DeferredCompensationArrangementWithIndividualSharesOutstanding
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Restricted Stock Units (RSUs) [Member]      
Summary of stock units and stock options outstanding under the Comprehensive Plan      
Common stock units related to deferred compensation 87,993hmn_DeferredCompensationArrangementWithIndividualSharesOutstanding
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember		 118,062hmn_DeferredCompensationArrangementWithIndividualSharesOutstanding
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember		 111,928hmn_DeferredCompensationArrangementWithIndividualSharesOutstanding
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember