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Commitments, Contingencies and Guarantees: Gain Contingency (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2023
Loss Contingencies [Line Items]
Gain on Business Interruption Insurance Recovery, Statement of Income or Comprehensive Income [Extensible Enumeration]		Revenues
Black Hills Wyoming and Wyodak Resources Development Corporation
Loss Contingencies [Line Items]
Gain on Business Interruption Insurance Recovery	$ 5.0

X

- Definition

The net amount (to the extent disclosed within this portion of the income statement) by which an insurance settlement exceeds incremental costs incurred from the event causing an interruption of business, plus the insurance award for earnings lost from the event, such as a natural catastrophe, explosion or fire.

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Indicates line item in statement of income or comprehensive income that includes gain from business interruption insurance recovery.

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