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Regulatory Matters - Narrative (Details) - North Dakota Rate Case - NDPSC $ in Millions	Nov. 02, 2023 USD ($)
Schedule of Regulatory Assets and Liabilities [Line Items]
Requested rate increase, amount	$ 17.4
Requested rate increase, percent (as a percent)	8.40%
Requested return on base rate, percent (as a percent)	7.85%
Requested equity ratio, percent (as a percent)	10.60%
Requested return on equity, percent (as a percent)	53.50%
Revenue, interim rate increase, amount	$ 12.4
Revenue, interim rate increase, percentage (as a percent)	6.00%