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Pension and Other Post-Retirement Benefit Plans (Expected Benefit Payments) (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Other Post-retirement Benefits  
Pension and Other Postretirement Benefit Plans Disclosure [Line Items]  
2018 $ 0.7
2019 0.7
2020 0.7
2021 0.7
2022 0.7
2023-2027 2.9
U.S. | Pensions  
Pension and Other Postretirement Benefit Plans Disclosure [Line Items]  
2018 33.4
2019 34.1
2020 34.7
2021 35.5
2022 34.9
2023-2027 174.3
International | Pensions  
Pension and Other Postretirement Benefit Plans Disclosure [Line Items]  
2018 28.2
2019 30.9
2020 33.3
2021 34.4
2022 35.5
2023-2027 $ 197.5