XML 36 R71.htm IDEA: XBRL DOCUMENT v2.4.1.9
Pension and Other Post-Retirement Benefit Plans (Schedule of Plan Assets Allocations) (Details)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
EPT Pension Plans [Member] | Active Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Actual allocation percentage 100.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ omg_DefinedBenefitPlansByStatusTypeAxis
= omg_ActivePlansMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= omg_EaglepicherTechnologiesPensionPlansMember		  
Target allocation percentage 100.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ omg_DefinedBenefitPlansByStatusTypeAxis
= omg_ActivePlansMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= omg_EaglepicherTechnologiesPensionPlansMember		  
EPT Pension Plans [Member] | Active Plans [Member] | U.S. Equity Securites [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Actual allocation percentage 11.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= omg_USEquitySecuritesMember
/ omg_DefinedBenefitPlansByStatusTypeAxis
= omg_ActivePlansMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= omg_EaglepicherTechnologiesPensionPlansMember		  
Target allocation percentage 11.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= omg_USEquitySecuritesMember
/ omg_DefinedBenefitPlansByStatusTypeAxis
= omg_ActivePlansMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= omg_EaglepicherTechnologiesPensionPlansMember		  
EPT Pension Plans [Member] | Active Plans [Member] | Non-US Equity Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Actual allocation percentage 11.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= omg_NonUSEquitySecuritiesMember
/ omg_DefinedBenefitPlansByStatusTypeAxis
= omg_ActivePlansMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= omg_EaglepicherTechnologiesPensionPlansMember		  
Target allocation percentage 11.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= omg_NonUSEquitySecuritiesMember
/ omg_DefinedBenefitPlansByStatusTypeAxis
= omg_ActivePlansMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= omg_EaglepicherTechnologiesPensionPlansMember		  
EPT Pension Plans [Member] | Active Plans [Member] | Fixed Income [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Actual allocation percentage 62.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_FixedIncomeFundsMember
/ omg_DefinedBenefitPlansByStatusTypeAxis
= omg_ActivePlansMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= omg_EaglepicherTechnologiesPensionPlansMember		  
Target allocation percentage 62.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_FixedIncomeFundsMember
/ omg_DefinedBenefitPlansByStatusTypeAxis
= omg_ActivePlansMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= omg_EaglepicherTechnologiesPensionPlansMember		  
EPT Pension Plans [Member] | Active Plans [Member] | High Yield [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Actual allocation percentage 5.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= omg_HighYieldFixedIncomeMember
/ omg_DefinedBenefitPlansByStatusTypeAxis
= omg_ActivePlansMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= omg_EaglepicherTechnologiesPensionPlansMember		  
Target allocation percentage 5.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= omg_HighYieldFixedIncomeMember
/ omg_DefinedBenefitPlansByStatusTypeAxis
= omg_ActivePlansMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= omg_EaglepicherTechnologiesPensionPlansMember		  
EPT Pension Plans [Member] | Active Plans [Member] | TIPS [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Actual allocation percentage 5.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= omg_TreasuryInflationProtectedSecuritiesMember
/ omg_DefinedBenefitPlansByStatusTypeAxis
= omg_ActivePlansMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= omg_EaglepicherTechnologiesPensionPlansMember		  
Target allocation percentage 5.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= omg_TreasuryInflationProtectedSecuritiesMember
/ omg_DefinedBenefitPlansByStatusTypeAxis
= omg_ActivePlansMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= omg_EaglepicherTechnologiesPensionPlansMember		  
EPT Pension Plans [Member] | Active Plans [Member] | Global REITS [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Actual allocation percentage 5.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_RealEstateMember
/ omg_DefinedBenefitPlansByStatusTypeAxis
= omg_ActivePlansMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= omg_EaglepicherTechnologiesPensionPlansMember		  
Target allocation percentage 5.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_RealEstateMember
/ omg_DefinedBenefitPlansByStatusTypeAxis
= omg_ActivePlansMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= omg_EaglepicherTechnologiesPensionPlansMember		  
EPT Pension Plans [Member] | Active Plans [Member] | Cash [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Actual allocation percentage 1.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_CashMember
/ omg_DefinedBenefitPlansByStatusTypeAxis
= omg_ActivePlansMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= omg_EaglepicherTechnologiesPensionPlansMember		  
Target allocation percentage 1.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_CashMember
/ omg_DefinedBenefitPlansByStatusTypeAxis
= omg_ActivePlansMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= omg_EaglepicherTechnologiesPensionPlansMember		  
SCM and Non-U.S. Pension Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Actual allocation percentage 100.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= omg_ScmAndForeignPensionPlansMember		 100.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= omg_ScmAndForeignPensionPlansMember
SCM and Non-U.S. Pension Plans [Member] | U.S. Equity Securites [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Actual allocation percentage 33.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= omg_USEquitySecuritesMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= omg_ScmAndForeignPensionPlansMember		 38.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= omg_USEquitySecuritesMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= omg_ScmAndForeignPensionPlansMember
SCM and Non-U.S. Pension Plans [Member] | Corporate Bonds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Actual allocation percentage 8.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_CorporateBondSecuritiesMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= omg_ScmAndForeignPensionPlansMember		 10.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_CorporateBondSecuritiesMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= omg_ScmAndForeignPensionPlansMember
SCM and Non-U.S. Pension Plans [Member] | Government Bonds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Actual allocation percentage 11.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= omg_ScmAndForeignPensionPlansMember		 10.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= omg_ScmAndForeignPensionPlansMember
SCM and Non-U.S. Pension Plans [Member] | Fixed Income [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Actual allocation percentage 15.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_FixedIncomeFundsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= omg_ScmAndForeignPensionPlansMember		 13.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_FixedIncomeFundsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= omg_ScmAndForeignPensionPlansMember
SCM and Non-U.S. Pension Plans [Member] | Non-US Assets [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Actual allocation percentage 31.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= omg_NonUSAssetsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= omg_ScmAndForeignPensionPlansMember		 27.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= omg_NonUSAssetsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= omg_ScmAndForeignPensionPlansMember
SCM and Non-U.S. Pension Plans [Member] | Cash [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Actual allocation percentage 2.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_CashMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= omg_ScmAndForeignPensionPlansMember		 2.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_CashMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= omg_ScmAndForeignPensionPlansMember