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Discontinued Operations (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
1 Months Ended 12 Months Ended
Jan. 31, 2013
Jun. 30, 2013
Jul. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Dec. 18, 2014
Continental Industries            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Sales price $ 37.4us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= hnh_ContinentalIndustriesInc.Member
         
Working capital adjustment 0.1hnh_DisposalGroupIncludingDiscontinuedOperationsWorkingCapitalAdjustment
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= hnh_ContinentalIndustriesInc.Member
         
Proceeds held in escrow         3.7hnh_DisposalGroupsIncludingDiscontinuedOperationsProceedsHeldinEscrow
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= hnh_ContinentalIndustriesInc.Member
 
CMCC            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Sales price   9.5us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= hnh_CanfieldMetalCoatingCorporationMember
       
Working capital adjustment   0.5hnh_DisposalGroupIncludingDiscontinuedOperationsWorkingCapitalAdjustment
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= hnh_CanfieldMetalCoatingCorporationMember
       
ITM            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Sales price     3.7us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= hnh_IndianaTubedeMexicoSDeR.L.deC.VMember
     
Restructuring reserve         0.9us-gaap_RestructuringReserve
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= hnh_IndianaTubedeMexicoSDeR.L.deC.VMember
 
Indiana Tube Denmark            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Sales price       2.4us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= hnh_IndianaTubeDenmarkMemberMember
   
Foreign currency translation gains     2.6us-gaap_DisposalGroupIncludingDiscontinuedOperationForeignCurrencyTranslationGainsLosses
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= hnh_IndianaTubeDenmarkMemberMember
     
Note receivable       0.8hnh_DisposalGroupIncludingDiscontinuedOperationNoteReceivable
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= hnh_IndianaTubeDenmarkMemberMember
   
Note receivable payment term (in years)       5 years    
Handy & Harman Group Ltd. | Arlon, LLC            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Sales price           $ 157.0us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= hnh_ArlonLLCMember
/ dei_LegalEntityAxis
= hnh_HandyHarmanGroupLtdMember