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Employee Benefits - Cash Flows (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Expected contributions to the plans during the next year $ 11.6
2020 236.9
2021 236.7
2022 228.4
2023 226.8
2024 218.8
2025 through 2029 1,004.2
OPEB Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Expected contributions to the plans during the next year 0.9
2020 37.1
2021 34.7
2022 35.6
2023 36.1
2024 36.1
2025 through 2029 $ 179.5