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Pension Plans and Other Postretirement Benefits Current Forecast of Benefit Payments which Reflect Expected Future Service (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Other Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 4.6
2019 4.4
2020 4.2
2021 3.9
2022 3.9
2023-2027 18.2
U.S. Plans | Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
2018 41.2
2019 43.2
2020 43.9
2021 44.3
2022 44.6
2023-2027 224.2
Foreign Plans | Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
2018 13.9
2019 9.1
2020 10.2
2021 10.8
2022 10.0
2023-2027 $ 59.0