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Employee Retirement Plans (Details 6) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Benefit payments expected to be paid in future  
2015 $ 18.5us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
2016 19.8us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
2017 20.9us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
2018 22.0us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
2019 24.0us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
2020-2024 $ 133.7us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter