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Employee Benefit Plans: Plan Contributions (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2025
USD ($)
Defined Benefit Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
Payment for Pension Benefits $ 1.8
Estimated Future Employer Contributions in Current Fiscal Year 0.0
Other Postretirement Benefits Plan  
Defined Benefit Plan Disclosure [Line Items]  
Payment for Pension Benefits 3.5
Estimated Future Employer Contributions in Current Fiscal Year 1.2
Supplemental Non-Qualified Defined Benefit Plans  
Defined Benefit Plan Disclosure [Line Items]  
Payment for Pension Benefits 2.1
Estimated Future Employer Contributions in Current Fiscal Year $ 0.7