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Postretirement Benefits Other Than Pensions - Estimated Post retirement Health Care Plan Benefit Payments (Details) - Postretirement Benefits
$ in Millions
Dec. 31, 2019
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 2.5
2021 2.3
2022 2.2
2023 2.2
2024 2.2
Next five years $ 10.9