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Regulatory Matters - Narrative (Details) - South Dakota Rate Case - SDPUC $ in Millions	Jun. 04, 2025 USD ($)
Schedule of Regulatory Assets and Liabilities [Line Items]
Requested rate increase, amount	$ 5.7
Requested rate increase, percent (as a percent)	12.50%
Requested return on base rate, percent (as a percent)	8.29%
Requested return on equity, percent (as a percent)	10.80%
Requested equity ratio, percent (as a percent)	53.54%
Requested rate increase rates on interim, term	180 days