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Pension and Postretirement Benefits (Expected Benefit Payments) (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Postretirement Medical Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Expected Payment, 2018 $ 3.0
Expected Payment, 2019 2.8
Expected Payment, 2020 2.6
Expected Payment, 2021 2.3
Expected Payment, 2022 2.1
Expected Payment, 2023-2027 8.1
Medicare Subsidy, 2018 0.1
Medicare Subsidy, 2019 0.1
Medicare Subsidy, 2020 0.1
Medicare Subsidy, 2021 0.1
Medicare Subsidy, 2022 0.1
Medicare Subsidy, 2023-2027 0.3
Domestic Plan  
Defined Benefit Plan Disclosure [Line Items]  
Expected Payment, 2018 39.5
Expected Payment, 2019 39.5
Expected Payment, 2020 40.7
Expected Payment, 2021 44.3
Expected Payment, 2022 42.3
Expected Payment, 2023-2027 202.9
Foreign Plan  
Defined Benefit Plan Disclosure [Line Items]  
Expected Payment, 2018 17.5
Expected Payment, 2019 16.9
Expected Payment, 2020 17.2
Expected Payment, 2021 17.7
Expected Payment, 2022 18.5
Expected Payment, 2023-2027 $ 97.3