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Employee Benefits - Cash Flows (Details) $ in Millions | Dec. 31, 2020 USD ($)
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Pension Benefits |
Defined Benefit Plan Disclosure [Line Items] |
Expected contributions to the plans during the next year | $ 11.6
2021 | 237.4
2022 | 231.8
2023 | 230.6
2024 | 222.2
2025 | 215.4
2026 through 2030 | 989.9
OPEB Benefits |
Defined Benefit Plan Disclosure [Line Items] |
Expected contributions to the plans during the next year | 2.1
2021 | 34.2
2022 | 34.4
2023 | 34.7
2024 | 34.5
2025 | 34.5
2026 through 2030 | $ 169.0

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