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Business Description And Significant Accounting Policies: Property, Plant and Equipment (AFUDC) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Interest expense incurred net of amounts capitalized |  |  |
AFUDC Borrowed | $ 6.0 | $ 5.6 | $ 4.1
Other Nonoperating Income (Expense) |  |  |
AFUDC Equity | $ 0.4 | $ 0.6 | $ 0.6

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