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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
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Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Life Settlement Contracts, Fair Value Method, Face Value | $ 11.3 us-gaap_LifeSettlementContractsFairValueMethodFaceValue | $ 11.4 us-gaap_LifeSettlementContractsFairValueMethodFaceValue
Fair Value, Inputs, Level 1 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Life Settlement Contracts, Fair Value Method, Face Value | 0 us-gaap_LifeSettlementContractsFairValueMethodFaceValue / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 us-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 | 0 us-gaap_LifeSettlementContractsFairValueMethodFaceValue / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 0 us-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 | $ 11.3 us-gaap_LifeSettlementContractsFairValueMethodFaceValue / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | $ 11.4 us-gaap_LifeSettlementContractsFairValueMethodFaceValue / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member

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- Definition Face value (death benefits) of the life insurance policies underlying the life settlement contracts accounted for under the fair value method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Life Settlement Contract -URI http://asc.fasb.org/extlink&oid=6516907 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 30 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6385267&loc=d3e42732-111610 + Details
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