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Employee Benefits - Cash Flows (Details) $ in Millions | Dec. 31, 2017 USD ($)
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Pension Costs |
Defined Benefit Plan Disclosure [Line Items] |
Expected contributions to the plans during the next year | $ 12.2
2018 | 234.3
2019 | 233.4
2020 | 236.3
2021 | 233.4
2022 | 220.3
2023 through 2027 | 1,026.8
OPEB Costs |
Defined Benefit Plan Disclosure [Line Items] |
Expected contributions to the plans during the next year | 0.9
2018 | 44.2
2019 | 46.3
2020 | 46.6
2021 | 48.1
2022 | 49.4
2023 through 2027 | $ 258.2

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