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Postretirement Health Care and Life Insurance Benefits Estimated Future Benefit Payments (Details) - Postretirement Health Care and Life Insurance Benefits
$ in Millions
Dec. 31, 2019
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 46.1
2021 46.0
2022 45.6
2023 44.9
2024 44.1
Years 2025-2029 $ 205.8