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REGULATORY ENVIRONMENT - 2023 MERC RATE ORDER (Details) - USD ($) $ in Millions | 1 Months Ended |  |
--- | --- | --- | ---
Nov. 30, 2023 | Dec. 31, 2022 | Mar. 31, 2024 | Dec. 31, 2023
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory liability for interim rate refunds |  |  | $ 3,809.4 | $ 3,745.2
Minnesota Public Utilities Commission (MPUC) | MERC |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Interim rate increase |  | $ 37.0 |  |
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% |  |  |
Minnesota Public Utilities Commission (MPUC) | MERC | Revenue Subject to Refund |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory liability for interim rate refunds |  |  | $ 10.8 |

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