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Pensions and Postretirement Benefits (Summary Company's Expected Future Benefit Payments) (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 5.7
2021 5.9
2022 6.1
2023 6.2
2024 6.2
2025 to 2029 31.0
Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2020 0.9
2021 0.8
2022 0.7
2023 0.7
2024 0.7
2025 to 2029 2.7
Postretirement Benefits | Gross  
Defined Benefit Plan Disclosure [Line Items]  
2020 1.0
2021 0.9
2022 0.8
2023 0.8
2024 0.8
2025 to 2029 3.0
Postretirement Benefits | Expected Medicare Subsidy  
Defined Benefit Plan Disclosure [Line Items]  
2020 0.1
2021 0.1
2022 0.1
2023 0.1
2024 0.1
2025 to 2029 $ 0.3