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COMMON SHARES - Narrative (Details) $ in Millions |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Oct. 03, 2022 USD ($) customer shares | May 11, 2022 USD ($) | Sep. 30, 2022 USD ($) shares | Dec. 31, 2021 shares
Business Acquisition [Line Items] |  |  |  |
Sale of stock, issuance of common stock, maximum | $ |  | $ 1,200.0 |  |
Sale of stock, consideration received on transaction | $ |  |  | $ 197.1 |
Sale of stock, number of shares issued in transaction (in shares) |  |  | 2,165,671 |
Treasury stock (in shares) |  |  | 12,635,324 | 13,415,206
Common stock outstanding (in shares) |  |  | 347,348,749 | 344,403,196
The Torrington Water Company (TWC) | Subsequent Event | Subsidiaries |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business acquisition, number of treasury shares issued (in shares) | 925,264 |  |  |
Consideration transferred | $ | $ 72.0 |  |  |
Number of customers | customer | 10,100 |  |  |

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