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Employee Benefits - Expected Benefit Payments (Details)
$ in Millions
Dec. 31, 2024
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2025 $ 9.1
2026 9.8
2027 10.4
2028 11.0
2029 11.8
2030-2034 63.4
Salaried VEBA  
Defined Benefit Plan Disclosure [Line Items]  
2025 5.3
2026 5.1
2027 4.9
2028 4.6
2029 4.3
2030-2034 16.9
Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
2025 0.7
2026 0.9
2027 1.1
2028 1.3
2029 1.7
2030-2034 11.7
Other Postretirement Benefits Plan  
Defined Benefit Plan Disclosure [Line Items]  
2025 3.1
2026 3.8
2027 4.4
2028 5.1
2029 5.8
2030-2034 $ 34.8