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Business Description And Significant Accounting Policies: Materials, Supplies and Fuel (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Inventory, Net [Abstract]    
Materials and supplies $ 105.9 $ 99.7
Fuel 7.7 3.1
Natural gas in storage 47.3 104.6
Total materials, supplies and fuel $ 160.9 $ 207.4