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Pension and Postretirement Benefits ( Defined Benefits Plan Assets, Target Allocations) (Details)
 12 Months Ended
Dec. 31, 2014
Debt Securities [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Defined Benefit Plan, Target Plan Asset Allocations 69.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_DebtSecuritiesMember
Equity Securities [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Defined Benefit Plan, Target Plan Asset Allocations 19.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember
Real Estate [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Defined Benefit Plan, Target Plan Asset Allocations 6.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_RealEstateMember
Other Investments [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Defined Benefit Plan, Target Plan Asset Allocations 6.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_OtherInvestmentsMember