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Commitments, Contingencies and Guarantees (Details) a in Millions, $ in Millions		3 Months Ended
	Apr. 13, 2022 USD ($) a	Sep. 30, 2023 USD ($)
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]
Business interruption insurance recovered		$ 5.0
GT Resources, LLC | Pending Litigation
Loss Contingencies [Line Items]
Loss Contingency, Damages Awarded, Value	$ 41.0
Loss Contingency, Concession Award, Area | a	2.3

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Loss Contingency, Concession Award, Area

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of damages awarded to the plaintiff in the legal matter.

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