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RELATED PARTY TRANSACTIONS - MISA Agreements (Narrative) (Details) - MISA - Related Party ر.س in Millions, $ in Millions | 1 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 28, 2022 | Sep. 30, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 SAR (ر.س) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 SAR (ر.س)
MISA Agreement - AMP-2 |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Period for suspension of funding, operation commencement | 30 months |  |  |  |  |
Period for suspension of funding, attainment of agreed scope of operations | 55 months |  |  |  |  |
Government Grant |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, amount of transaction |  |  | $ 97.5 | ر.س 366 | $ 97.3 | ر.س 366
Government Grant | AMP-2 Construction In Progress Balance |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, amount of transaction |  | $ (69.7) | (12.1) |  | (33.3) |
Government Grant | AMP-2 Fixed Asset and AMP-2 Construction in Progress Balance |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, amount of transaction |  | $ 97.5 | (35.0) |  |  |
Government Grant | Other Noncurrent Liabilities |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, amount of transaction |  |  |  |  | $ 64.0 |
Government Grant | Other Noncurrent Liabilities | AMP-2 Fixed Asset and AMP-2 Construction in Progress Balance |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, amount of transaction |  |  | 62.5 |  |  |
Government Grant | Other Noncurrent Assets |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, amount of transaction |  |  | $ 64.0 |  |  |

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