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Pension and Post-retirement and Other Benefit Plans - Summary of Expected Benefit Payments from Various Pension and Postretirement Plans (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Pensions  
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 15.3
2019 15.6
2020 18.6
2021 16.9
2022 17.5
2023 - 2027 99.2
Other post-retirement benefits  
Defined Benefit Plan Disclosure [Line Items]  
2018 0.2
2019 0.2
2020 0.2
2021 0.2
2022 0.2
2023 - 2027 $ 1.0