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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, 2018
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2019 $ 43.4
2020 45.3
2021 46.6
2022 45.8
2023 44.5
Years 2024-2028 $ 205.9