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Pension and Other Retiree Benefits (Estimated Future Benefit Payments) (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Pension  
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 41.4
2022 41.8
2023 42.4
2024 42.8
2025 43.8
Years 2026 - 2030 223.5
Post-retirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2021 0.5
2022 0.4
2023 0.4
2024 0.4
2025 0.4
Years 2026 - 2030 $ 1.7