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Postretirement Health Care and Life Insurance Benefits - Estimated Future Benefit Payments (Details) - Postretirement Health Care and Life Insurance Benefits
$ in Millions
Dec. 31, 2025
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2026 $ 16.2
2027 15.4
2028 14.7
2029 13.7
2030 12.9
Years 2031-2035 $ 51.7