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

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- Definition Share based compensation arrangement by share based payment awards equity instruments outstanding. + References No definition available. + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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