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Postretirement Benefits Other Than Pensions - Benefit Payments Net of Expected Medicare Part D Subsidy (Details) - Other Postretirement Benefit Plan, Defined Benefit $ in Millions | Dec. 31, 2019 USD ($)
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Estimated Benefit Payments Excluding Medicare Part D Subsidy |
2020 | $ 1.3
2021 | 1.3
2022 | 1.3
2023 | 1.2
2024 | 1.2
2025-2029 | 4.5
Expected Medicare Part D Subsidy |
2020 | 0.0
2021 | 0.0
2022 | 0.0
2023 | 0.0
2024 | 0.0
2025-2029 | 0.0
Net Estimated Benefit Payments |
2020 | 1.3
2021 | 1.3
2022 | 1.3
2023 | 1.2
2024 | 1.2
2025-2029 | $ 4.5

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