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Employee Benefits - Cash Flows (Details)
$ in Millions
Dec. 31, 2023
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Expected contributions to the plans during the next year $ 13.1
2024 207.0
2025 199.6
2026 202.2
2027 193.9
2028 188.8
2029 through 2033 847.4
OPEB Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Expected contributions to the plans during the next year 2.2
2024 34.3
2025 34.4
2026 34.9
2027 35.4
2028 35.5
2029 through 2033 $ 175.3