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Employee Benefit Plans: Plan Contributions (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year $ 2.3  
Payment for Pension Benefits 0.0 $ 0.0
Other Postretirement Benefits Plan    
Defined Benefit Plan Disclosure [Line Items]    
Payment for Pension and Other Postretirement Benefits 5.4 6.1
Payment for Pension Benefits 4.3 4.5
Supplemental Non-Qualified Defined Benefit Plans    
Defined Benefit Plan Disclosure [Line Items]    
Payment for Pension Benefits 3.5 3.1
Defined Contribution Plan, Company Retirement    
Defined Benefit Plan Disclosure [Line Items]    
Defined Contribution Plan, Employer Discretionary Contribution Amount 12.7 11.9
Defined Contribution Plan, 401K    
Defined Benefit Plan Disclosure [Line Items]    
Defined Contribution Plan, Employer Discretionary Contribution Amount $ 17.1 $ 16.2