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Post Employment Plans - Expected Future Minimum Benefit Payment (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Pension plan  
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 1.4
2019 1.5
2020 2.3
2021 2.1
2022 2.6
Thereafter 20.1
Other Postretirement Benefits Plan  
Defined Benefit Plan Disclosure [Line Items]  
2018 0.1
2019 0.2
2020 0.2
2021 0.2
2022 0.3
Thereafter $ 1.9