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GOODWILL - Narrative (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Oct. 01, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Goodwill [Line Items] |  |  |
Goodwill acquired |  | $ 21,000,000 | $ 42,000,000
Goodwill measurement period adjustments |  | 10,000,000 |
Goodwill disposed of |  |  | 23,000,000
Impairment loss | $ 0 |  |
CMA |  |  |
Goodwill [Line Items] |  |  |
Goodwill acquired |  | 51,900,000 |
Water Distribution |  |  |
Goodwill [Line Items] |  |  |
Goodwill acquired |  | 21,700,000 | 0
Goodwill measurement period adjustments |  | 0 |
Goodwill disposed of |  |  | 23,000,000
Water Distribution | Hingham Water System |  |  |
Goodwill [Line Items] |  |  |
Goodwill disposed of |  | 23,600,000 |
Water Distribution | CMA |  |  |
Goodwill [Line Items] |  |  |
Goodwill measurement period adjustments |  | 9,600,000 |
Natural Gas Distribution |  |  |
Goodwill [Line Items] |  |  |
Goodwill acquired |  | 0 | 42,000,000
Goodwill measurement period adjustments |  | $ 10,000,000 |
Goodwill disposed of |  |  | $ 0

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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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