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Business Description And Significant Accounting Policies: Changes to Allowance for Credit Losses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at Beginning of Year $ 2.2 $ 3.0 $ 2.1
Additions Charged to Costs and Expenses 5.6 8.7 9.1
Recoveries and Other Additions 4.2 4.1 3.5
Write-offs and Other Deductions (9.9) (13.6) (11.7)
Balance at End of Year $ 2.1 $ 2.2 $ 3.0