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Post Employment Plans - Expected Future Minimum Benefit Payment (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Pension plan  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 2.0
2021 1.9
2022 2.4
2023 2.3
2024 3.3
Thereafter 22.8
Other Postretirement Benefits Plan  
Defined Benefit Plan Disclosure [Line Items]  
2020 0.1
2021 0.2
2022 0.2
2023 0.2
2024 0.2
Thereafter $ 1.3