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GOODWILL - Summary of Goodwill by Reportable Segment (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Oct. 03, 2022 | Dec. 31, 2022 | Dec. 31, 2021
Goodwill [Roll Forward] |  |  |
Beginning Balance |  | $ 4,477,269 | $ 4,446,000
Ending Balance |  | 4,522,632 | 4,477,269
The Torrington Water Company (TWC) |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill acquired |  | 44,800 |
New England Service Company (NESC) |  |  |
Goodwill [Roll Forward] |  |  |
Measurement Period Adjustments |  | 500 |
Goodwill acquired |  |  | 21,700
CMA |  |  |
Goodwill [Roll Forward] |  |  |
Measurement Period Adjustments |  |  | 9,600
Goodwill acquired |  | 51,900 |
Electric Distribution |  |  |
Goodwill [Roll Forward] |  |  |
Beginning Balance |  | 2,543,600 | 2,543,600
Ending Balance |  | 2,543,600 | 2,543,600
Electric Distribution | The Torrington Water Company (TWC) |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill acquired |  | 0 |
Electric Distribution | New England Service Company (NESC) |  |  |
Goodwill [Roll Forward] |  |  |
Measurement Period Adjustments |  | 0 |
Goodwill acquired |  |  | 0
Electric Distribution | CMA |  |  |
Goodwill [Roll Forward] |  |  |
Measurement Period Adjustments |  |  | 0
Electric Transmission |  |  |
Goodwill [Roll Forward] |  |  |
Beginning Balance |  | 576,800 | 576,800
Ending Balance |  | 576,800 | 576,800
Electric Transmission | The Torrington Water Company (TWC) |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill acquired |  | 0 |
Electric Transmission | New England Service Company (NESC) |  |  |
Goodwill [Roll Forward] |  |  |
Measurement Period Adjustments |  | 0 |
Goodwill acquired |  |  | 0
Electric Transmission | CMA |  |  |
Goodwill [Roll Forward] |  |  |
Measurement Period Adjustments |  |  | 0
Natural Gas Distribution |  |  |
Goodwill [Roll Forward] |  |  |
Beginning Balance |  | 451,000 | 441,400
Ending Balance |  | 451,000 | 451,000
Natural Gas Distribution | The Torrington Water Company (TWC) |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill acquired |  | 0 |
Natural Gas Distribution | New England Service Company (NESC) |  |  |
Goodwill [Roll Forward] |  |  |
Measurement Period Adjustments |  | 0 |
Goodwill acquired |  |  | 0
Natural Gas Distribution | CMA |  |  |
Goodwill [Roll Forward] |  |  |
Measurement Period Adjustments |  |  | 9,600
Water Distribution |  |  |
Goodwill [Roll Forward] |  |  |
Beginning Balance |  | 905,900 | 884,200
Ending Balance |  | 951,200 | 905,900
Water Distribution | The Torrington Water Company (TWC) |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill acquired | $ 44,800 | 44,800 |
Water Distribution | New England Service Company (NESC) |  |  |
Goodwill [Roll Forward] |  |  |
Measurement Period Adjustments |  | 500 |
Goodwill acquired |  | 22,200 | 21,700
Water Distribution | CMA |  |  |
Goodwill [Roll Forward] |  |  |
Measurement Period Adjustments |  | $ 9,600 | $ 0

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