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ACQUISITIONS - THUNDERHEAD (Details) $ in Millions | 1 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 31, 2022 USD ($) | Sep. 30, 2022 USD ($) MW | Sep. 30, 2022 USD ($) MW | Sep. 30, 2021 USD ($)
Asset Acquisition [Line Items] |  |  |  |
Payments to acquire Thunderhead |  |  | $ 0.0 | $ 119.8
Thunderhead | WECI |  |  |  |
Asset Acquisition [Line Items] |  |  |  |
Ownership interest of wind generating facility acquired |  | 90.00% | 90.00% |
Capacity of generation unit | MW |  | 300 | 300 |
Acquisition purchase price |  | $ 381.9 |  |
Payments to acquire Thunderhead |  | 362.9 |  |
Construction payable |  | $ 19.0 | $ 19.0 |
Duration of offtake agreement for the sale of energy produced |  | 12 years |  |
Thunderhead | WECI | Subsequent event |  |  |  |
Asset Acquisition [Line Items] |  |  |  |
Construction payable | $ 9.5 |  |  |
Payments for previous acquisition | $ 9.5 |  |  |

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