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Pensions and Postretirement Benefits (Summary Company's Expected Future Benefit Payments) (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 5.9
2022 6.1
2023 6.2
2024 6.3
2025 6.3
2026 to 2030 31.4
Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2021 0.8
2022 0.7
2023 0.7
2024 0.7
2025 0.6
2026 to 2030 2.6
Postretirement Benefits | Gross  
Defined Benefit Plan Disclosure [Line Items]  
2021 0.9
2022 0.8
2023 0.8
2024 0.8
2025 0.7
2026 to 2030 2.8
Postretirement Benefits | Expected Medicare Subsidy  
Defined Benefit Plan Disclosure [Line Items]  
2021 0.1
2022 0.1
2023 0.1
2024 0.1
2025 0.1
2026 to 2030 $ 0.2