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REGULATORY ENVIRONMENT - 2023 MINNESOTA RATE CASE (Details) - Minnesota Public Utilities Commission (MPUC) - MERC - USD ($) $ in Millions |  | 1 Months Ended
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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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