v3.25.2
Employee Benefit Plans: Plan Contributions (Details)
$ in Millions
 6 Months Ended
Jun. 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 2.3
Estimated Future Employer Contributions in Current Fiscal Year 2.3
Supplemental Non-Qualified Defined Benefit Plans  
Defined Benefit Plan Disclosure [Line Items]  
Payment for Pension Benefits 1.4
Estimated Future Employer Contributions in Current Fiscal Year $ 1.4