XML 72 R54.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Summary of Significant Accounting Policies - Narrative (Details) - USD ($) |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 07, 2017 | Oct. 10, 2017 | Dec. 28, 2015 | Sep. 18, 2014 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Basis of Presentation [Line Items] |  |  |  |  |  |  |
Amortization term for acquisition costs of annuity contracts |  |  |  |  | 20 years |  |
Amortization term for acquisition costs of indexed universal life contracts |  |  |  |  | 30 years |  |
Amortization of acquisition costs for individual life contracts, first term |  |  |  |  | 10 years |  |
Amortization of acquisition costs for individual life contracts, second term |  |  |  |  | 15 years |  |
Amortization of acquisition costs for individual life contracts, third term |  |  |  |  | 20 years |  |
Amortization of acquisition costs for individual life contracts, fourth term |  |  |  |  | 30 years |  |
Amortization of acquisition costs for property and casualty contracts, first term |  |  |  |  | 6 months |  |
Amortization of acquisition costs for property and casualty contracts, second term |  |  |  |  | 12 months |  |
FHLB borrowings | $ 25,000,000 | $ 50,000,000 |  |  | $ 50,000,000 | $ 0 | $ 0
Weighted average fair value of nonvested options outstanding |  |  |  |  | $ 6.49 |  |
Unrecognized share-based compensation expense, nonvested options |  |  |  |  | $ 2,102,000 |  |
Antidilutive securities exclude from EPS computation (in shares) |  |  |  |  | 208,740 |  |
Other comprehensive income (loss), reclassification adjustment from AOCI from sale of securities |  |  |  |  | $ (4,863,000) | 5,176,000 | 11,667,000
Other tax expense (benefit) |  |  |  |  | $ (1,702,000) | 1,812,000 | 4,083,000
Minimum exercise price (in usd per share) |  |  |  |  | $ 38.05 |  |
Maximum exercise price (in usd per share) |  |  |  |  | $ 41.95 |  |
Excess tax benefit from share-based compensation |  |  |  |  | $ 3,344,000 |  |
Net cash used in financing activities |  |  |  |  | 36,965,000 | (115,088,000) | (211,969,000)
Net cash used in operating activities |  |  |  |  | 256,586,000 | 211,433,000 | 207,714,000
Non-cancellable operating leases |  |  |  |  | 9,760,000 |  |
Accounting Standards Update 2016-09 |  |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |  |
Net cash used in operating activities |  |  |  |  | 3,245,000 | 4,015,000 | 671,000
Accounting Standards Update 2016-09, Statutory Tax Withholding Component |  |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |  |
Net cash used in financing activities |  |  |  |  | 3,245,000 | 4,015,000 | 671,000
Adjustments for New Accounting Pronouncement |  |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |  |
Net cash provided by (used in) equity securities, short-term and other investments |  |  |  |  | 0 | 0 | 2,801,000
Adjustments for New Accounting Pronouncement | Pro Forma |  |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |  |
Other comprehensive income (loss), unrealized holding gain (loss) on securities arising during period |  |  |  |  | 15,125,000 |  |
Employee Stock Option |  |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  | 1,347,000 | 1,207,000 | 1,285,000
Restricted Stock Units |  |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  | 6,459,000 | 6,929,000 | $ 892,000
Unrecognized share-based compensation expense, equity instruments other than options |  |  |  |  | 7,355,000 |  |
Other policyholder funds |  |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |  |
FHLB Advances |  |  |  |  | $ 575,000,000 |  |
HMLIC |  |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |  |
Percentage of reversion to mean approach utilized to amortized policy acquisition costs |  |  |  |  | 10.00% |  |
FHLB borrowings |  |  | $ 75,000,000 | $ 250,000,000 |  |  |
FHLB Interest rate |  |  |  |  | 1.28% |  |
HMLIC | Maturing On September 13, 2019 |  |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |  |
FHLB Advances |  |  |  |  | $ 250,000,000 |  |
HMLIC | Maturing On December 15, 2023 |  |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |  |
FHLB Advances |  |  |  |  | 125,000,000 |  |
HMLIC | Maturing On January 16, 2026 |  |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |  |
FHLB Advances |  |  |  |  | 200,000,000 |  |
HMLIC | Investment Contracts |  |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |  |
FHLB Advances |  |  |  |  | $ 575,000,000 |  |
Maximum |  |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |  |
Reserve investment yield assumption life |  |  |  |  | 3.50% |  |
Minimum |  |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |  |
Reserve investment yield assumption life |  |  |  |  | 8.00% |  |
Real Estate Property | Maximum |  |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |  |
Property, plant and equipment, useful life |  |  |  |  | 45 years |  |
Real Estate Property | Minimum |  |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |  |
Property, plant and equipment, useful life |  |  |  |  | 20 years |  |
Lease hold Improvements And Other Property And Equipment | Maximum |  |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |  |
Property, plant and equipment, useful life |  |  |  |  | 10 years |  |
Lease hold Improvements And Other Property And Equipment | Minimum |  |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |  |
Property, plant and equipment, useful life |  |  |  |  | 2 years |  |
Interest Sensitive Life Contracts |  |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |  |
Amortization period of acquisition costs of interest sensitive life contracts |  |  |  |  | 20 years |  |
Deferred policy acquisition costs, impact of unrealized investment gains (losses) |  |  |  |  | $ 57,995,000 | $ 40,274,000 |

X
- Definition The number of years over which capitalized acquisition costs are amortized for annuity contracts. Acquisition costs are amortized in proportion to estimated gross profits. + References No definition available. + Details
Name: | hnm_AcquisitionCostsAmortizationInYearsForAnnuityContracts
Namespace Prefix: | hnm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of years over which capitalized acquisition costs are amortized for indexed universal life contracts. Acquisition costs are amortized in proportion to estimated gross profits. + References No definition available. + Details
Name: | hnm_AcquisitionCostsAmortizationInYearsForIndexedUniversalLifeContracts
Namespace Prefix: | hnm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of years over which capitalized acquisition costs are amortized for individual life contracts. Acquisition costs are amortized in proportion to the anticipated premiums over the terms of the insurance policies. + References No definition available. + Details
Name: | hnm_AcquisitionCostsAmortizationInYearsForIndividualLifeContractsTermFour
Namespace Prefix: | hnm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of years over which capitalized acquisition costs are amortized for individual life contracts. Acquisition costs are amortized in proportion to the anticipated premiums over the terms of the insurance policies. + References No definition available. + Details
Name: | hnm_AcquisitionCostsAmortizationInYearsForIndividualLifeContractsTermOne
Namespace Prefix: | hnm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of years over which capitalized acquisition costs are amortized for individual life contracts. Acquisition costs are amortized in proportion to the anticipated premiums over the terms of the insurance policies. + References No definition available. + Details
Name: | hnm_AcquisitionCostsAmortizationInYearsForIndividualLifeContractsTermThree
Namespace Prefix: | hnm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of years over which capitalized acquisition costs are amortized for individual life contracts. Acquisition costs are amortized in proportion to the anticipated premiums over the terms of the insurance policies. + References No definition available. + Details
Name: | hnm_AcquisitionCostsAmortizationInYearsForIndividualLifeContractsTermTwo
Namespace Prefix: | hnm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of years over which capitalized acquisition costs are amortized on interest sensitive life contracts. Capitalized acquisition costs are amortized in proportion to estimated gross profits. + References No definition available. + Details
Name: | hnm_AmortizationPeriodOfAcquisitionCostsRelatedToInterestSensitiveLifeContracts
Namespace Prefix: | hnm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The period of time over which capitalized acquisition costs are amortized for property and casualty policies. Acquisition costs are amortized over the term of the insurance policy (6 and 12 months). + References No definition available. + Details
Name: | hnm_AmortizationPeriodOfAcquisitionCostsRelatedToPropertyAndCasualtyPolicyTermOne
Namespace Prefix: | hnm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The period of time over which capitalized acquisition costs are amortized for property and casualty policies. Acquisition costs are amortized over the term of the insurance policy (6 and 12 months). + References No definition available. + Details
Name: | hnm_AmortizationPeriodOfAcquisitionCostsRelatedToPropertyAndCasualtyPolicyTermTwo
Namespace Prefix: | hnm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition [Line Items] for Basis of Presentation [Table] + References No definition available. + Details
Name: | hnm_BasisofPresentationLineItems
Namespace Prefix: | hnm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Deferred policy acquisition cost ending impact of unrealized investment gains losses. + References No definition available. + Details
Name: | hnm_DeferredPolicyAcquisitionCostEndingImpactOfUnrealizedInvestmentGainsLosses
Namespace Prefix: | hnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount + References No definition available. + Details
Name: | hnm_EffectiveIncomeTaxRateReconciliationSharebasedCompensationExcessTaxBenefitAmount
Namespace Prefix: | hnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Payments To (Proceeds From) Available-for-sale Securities, Equity + References No definition available. + Details
Name: | hnm_PaymentsToProceedsFromAvailableforsaleSecuritiesEquity
Namespace Prefix: | hnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition For the variable deposit portion of the annuity segment, percentage of reversion to the mean approach utilized to amortize policy acquisition costs. + References No definition available. + Details
Name: | hnm_PercentageOfReversionToMeanApproachUtilizedToAmortizePolicyAcquisitionCosts
Namespace Prefix: | hnm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Reserve investment yield assumptions on certain life insurance policies. + References No definition available. + Details
Name: | hnm_ReserveInvestmentYieldAssumptionLife
Namespace Prefix: | hnm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average fair value of nonvested options outstanding. + References No definition available. + Details
Name: | hnm_WeightedAverageFairValueOfNonvestedOptionsOutstanding
Namespace Prefix: | hnm_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
Name: | us-gaap_AllocatedShareBasedCompensationExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
Name: | us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Unrecognized cost of unvested options awarded to employees as compensation. + 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of Federal Home Loan Bank (FHLBank) advances to member financial institutions. + References No definition available. + Details
Name: | us-gaap_FederalHomeLoanBankAdvances
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of advances from the Federal Home Loan Bank (FHLB). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
Name: | us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Discloses the single interest rate [if] applicable to the advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
Name: | us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3574-108585 + Details
Name: | us-gaap_NetCashProvidedByUsedInFinancingActivities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
Name: | us-gaap_NetCashProvidedByUsedInOperatingActivities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
Name: | us-gaap_OperatingLeasesFutureMinimumPaymentsDue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount before tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e689-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 + Details
Name: | us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 + Details
Name: | us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of other income tax expense (benefit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32672-109319 + Details
Name: | us-gaap_OtherTaxExpenseBenefit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of cash inflow from proceeds of Federal Home Loan Bank (FHLBank) advances. + References No definition available. + Details
Name: | us-gaap_ProceedsFromFederalHomeLoanBankAdvances
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201609Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=hnm_AccountingStandardsUpdate201609StatutoryTaxWithholdingComponentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_NewAccountingPronouncementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_ProFormaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=hnm_OtherPolicyholderFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=hnm_HoraceMannLifeInsuranceCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | hnm_MaturityDateAxis=hnm_MaturingOnSeptember132019Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | hnm_MaturityDateAxis=hnm_MaturingOnDecember152023Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | hnm_MaturityDateAxis=hnm_MaturingOnJanuary162026Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_InvestmentContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=hnm_RealEstatePropertyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=hnm_LeaseHoldImprovementsAndOtherPropertyAndEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis=hnm_InterestSensitiveLifeContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |