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Business Description And Significant Accounting Policies: Allowance for Doubtful Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Accounts Receivable, Allowance for Credit Loss, Current $ 3.0 $ 2.1 $ 7.0
Additions Charged to Costs and Expenses 8.7 9.1 2.4
Recoveries and Other Additions 4.1 3.5 3.6
Write-offs and Other Deductions (13.6) (11.7) (10.9)
Accounts Receivable, Allowance for Credit Loss, Current $ 2.2 $ 3.0 $ 2.1