REGULATORY ENVIRONMENT - 2023 MINNESOTA RATE CASE (Details) - Minnesota Public Utilities Commission (MPUC) - MERC - USD ($) $ in Millions		1 Months Ended
	Oct. 26, 2023	Dec. 31, 2022	Nov. 30, 2022
Public Utilities, General Disclosures [Line Items]
Requested rate increase			$ 40.3
Requested rate increase (as a percent)			9.90%
Requested return on equity (as a percent)			10.30%
Requested common equity component average (as a percent)			53.00%
Interim rate increase		$ 37.0
Subsequent event
Public Utilities, General Disclosures [Line Items]
Approved rate increase	$ 28.8
Approved rate increase (as a percent)	7.10%
Approved return on equity (as a percent)	9.65%
Approved common equity component average (as a percent)	53.00%