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Employee Benefits - Cash Flows (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Pension Costs  
Defined Benefit Plan Disclosure [Line Items]  
Expected contributions to the plans during the next year $ 11.9
2019 239.0
2020 233.0
2021 230.9
2022 225.7
2023 215.8
2024 through 2028 985.5
OPEB Costs  
Defined Benefit Plan Disclosure [Line Items]  
Expected contributions to the plans during the next year 0.7
2019 35.4
2020 39.6
2021 41.3
2022 41.6
2023 42.5
2024 through 2028 $ 213.6