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Retirement Plans (Details) (Pension Plans, USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Defined Benefit Plan Disclosure [Line Items]  
Employer contributions in current fiscal year $ 0.3us-gaap_DefinedBenefitPlanContributionsByEmployer
Minimum  
Defined Benefit Plan Disclosure [Line Items]  
Estimated future employer contributions in current fiscal year 1us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInCurrentFiscalYear
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum  
Defined Benefit Plan Disclosure [Line Items]  
Estimated future employer contributions in current fiscal year $ 2us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInCurrentFiscalYear
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember