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Defined Benefit Plans - Defined Benefit Plans Narrative (Details) (Pension Plans, Defined Benefit [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Pension Plans, Defined Benefit [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year $ 3.5us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInCurrentFiscalYear
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
Defined Benefit Plan, Contributions by Employer $ 0.7us-gaap_DefinedBenefitPlanContributionsByEmployer
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember