Employee Benefits - Expected Benefit Payments (Details) $ in Millions	Dec. 31, 2025 USD ($)
Defined Benefit Plan Disclosure [Line Items]
2026	$ 9.4
2027	10.2
2028	10.9
2029	11.6
2030	12.0
2031-2034	66.2
Salaried VEBA
Defined Benefit Plan Disclosure [Line Items]
2026	4.7
2027	4.5
2028	4.3
2029	4.0
2030	3.7
2031-2034	14.6
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
2026	1.0
2027	1.3
2028	1.5
2029	1.8
2030	2.0
2031-2034	13.7
Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
2026	3.7
2027	4.4
2028	5.1
2029	5.8
2030	6.3
2031-2034	$ 37.9