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Employee Benefit Plans OPEB Plan Assets, Fair Value Measurements by Input Level (Details) (Other Postretirement Benefit Plans, USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans    
Life Settlement Contracts, Fair Value Method, Face Value $ 11.3us-gaap_LifeSettlementContractsFairValueMethodFaceValue $ 11.4us-gaap_LifeSettlementContractsFairValueMethodFaceValue
Fair Value, Inputs, Level 1    
Defined Benefit Plans and Other Postretirement Benefit Plans    
Life Settlement Contracts, Fair Value Method, Face Value 0us-gaap_LifeSettlementContractsFairValueMethodFaceValue
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 0us-gaap_LifeSettlementContractsFairValueMethodFaceValue
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 2    
Defined Benefit Plans and Other Postretirement Benefit Plans    
Life Settlement Contracts, Fair Value Method, Face Value 0us-gaap_LifeSettlementContractsFairValueMethodFaceValue
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 0us-gaap_LifeSettlementContractsFairValueMethodFaceValue
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 3    
Defined Benefit Plans and Other Postretirement Benefit Plans    
Life Settlement Contracts, Fair Value Method, Face Value $ 11.3us-gaap_LifeSettlementContractsFairValueMethodFaceValue
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 $ 11.4us-gaap_LifeSettlementContractsFairValueMethodFaceValue
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member