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Pension and Other Retiree Benefits (Estimated Future Benefit Payments) (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Pension  
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 40.1
2019 39.2
2020 39.8
2021 40.7
2022 40.9
Years 2023 - 2027 212.4
Post-retirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2018 0.6
2019 0.6
2020 0.6
2021 0.5
2022 0.5
Years 2023 - 2027 $ 2.4