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Employee Benefit Plans (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Contributions to defined contribution plans $ 14,800,000us-gaap_DefinedContributionPlanCostRecognized [1] $ 13,700,000us-gaap_DefinedContributionPlanCostRecognized [1] $ 13,200,000us-gaap_DefinedContributionPlanCostRecognized [1]
Other Postretirement Benefit Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 3.23%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember		 3.57%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember		  
[1] Contributions of $0.4 million and $2.0 million were included in Loss from discontinued operations for the years ended December 31, 2013 and 2012, respectively.