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Business Description And Significant Accounting Policies: Materials, Supplies and Fuel (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Inventory, Net [Abstract]    
Materials and supplies $ 106.1 $ 105.9
Fuel 7.5 7.7
Natural gas in storage 40.3 47.3
Total materials, supplies and fuel $ 153.9 $ 160.9