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Regulatory Environment - MERC 2023 Rate Order (Details) - USD ($) $ in Millions |  | 1 Months Ended |
--- | --- | --- | ---
Nov. 14, 2023 | Dec. 31, 2022 | Dec. 31, 2023
Public Utilities, General Disclosures |  |  |
Regulatory liability |  | $ 3,791.9 | $ 3,745.2
Minnesota Public Utilities Commission (MPUC) | MERC |  |  |
Public Utilities, General Disclosures |  |  |
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 | Interim rate refunds |  |  |
Public Utilities, General Disclosures |  |  |
Regulatory liability |  |  | $ 8.5

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