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Employee Benefits - Cash Flows (Details)
$ in Millions
Dec. 31, 2024
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Expected contributions to the plans during the next year $ 12.1
2025 212.5
2026 214.4
2027 205.0
2028 197.2
2029 188.7
2030-2034 839.4
OPEB Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Expected contributions to the plans during the next year 2.6
2025 35.3
2026 36.7
2027 37.9
2028 38.5
2029 38.8
2030-2034 $ 189.4