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Employee Benefits - Expected Benefit Payments (Details)
$ in Millions
Dec. 31, 2023
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2024 $ 9.5
2025 10.1
2026 10.8
2027 11.5
2028 12.0
2029-2033 64.4
Salaried VEBA  
Defined Benefit Plan Disclosure [Line Items]  
2024 5.4
2025 5.2
2026 5.0
2027 4.8
2028 4.5
2029-2033 18.1
Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
2024 0.8
2025 1.0
2026 1.2
2027 1.5
2028 1.7
2029-2033 11.3
Other Postretirement Benefits Plan  
Defined Benefit Plan Disclosure [Line Items]  
2024 3.3
2025 3.9
2026 4.6
2027 5.2
2028 5.8
2029-2033 $ 35.0