REGULATORY ENVIRONMENT - 2023 MINNESOTA RATE CASE (Details) - Minnesota Public Utilities Commission (MPUC) - MERC - USD ($) $ in Millions		1 Months Ended
May 11, 2023	Dec. 31, 2022	Nov. 30, 2022
Public Utilities, General Disclosures [Line Items]
Requested rate increase	$ 28.8		$ 40.3
Requested rate increase (as a percent)	7.10%		9.90%
Requested return on equity (as a percent)	9.65%		10.30%
Requested common equity component average (as a percent)	53.00%		53.00%
Interim rate increase		$ 37.0

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Amount of public utility's interim rate increase (decrease) allowed while waiting final decision of regulatory agency.

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Percentage of public utility's requested equity to capital, including debt and equity.

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Amount of public utility's requested rate increase (decrease) with regulatory agency.

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Percentage of public utility's requested rate increase (decrease) with regulatory agency.

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Percentage of public utility's requested return on equity.

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