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Pension and Other Retiree Benefits (Estimated Future Benefit Payments) (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Pension  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 41.7
2021 42.3
2022 42.9
2023 43.5
2024 44.0
Years 2025 - 2029 228.1
Post-retirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2020 0.5
2021 0.5
2022 0.5
2023 0.4
2024 0.4
Years 2025 - 2029 $ 1.0