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Business Description And Significant Accounting Policies: Accounts Receivable (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Accounts Receivable [Line Items]        
Allowance for credit losses $ (2.2) $ (3.0) $ (2.1) $ (7.0)
Accounts Receivable, after Allowance for Credit Loss, Current, Total 350.3 508.2    
Billed Revenues        
Accounts Receivable [Line Items]        
Accounts Receivable, Trade 198.5 267.6    
Unbilled Revenues        
Accounts Receivable [Line Items]        
Accounts Receivable, Trade $ 154.0 $ 243.6