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Pensions and Other Postretirement Benefits Estimated Future Benefit Payments (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Pension Plan  
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]  
2019 $ 90.1
2020 86.5
2021 87.0
2022 86.5
2023 85.6
2024-2028 415.8
Other Pension Plan  
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]  
2019 2.1
2020 2.0
2021 1.9
2022 1.8
2023 1.7
2024-2028 $ 7.0