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ACQUISITION OF ASSETS OF COLUMBIA GAS OF MASSACHUSETTS - Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 09, 2020 | Dec. 31, 2020 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Business Acquisition [Line Items] |  |  |  |  |
Operating revenues |  |  |  |  | $ 154.8
Pre-tax income |  |  |  |  | 13.9
TSA |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
TSA and pre-TSA costs |  |  | $ 7.9 | $ 21.4 | 15.9
Energy efficiency expense |  | $ 2.0 |  |  |
CMA |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Consideration transferred | $ 1,100.0 |  |  |  |
Target working capital amount | $ 68.6 |  |  |  |
Operating revenues |  |  |  |  | $ 9,273.0

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