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RELATED PARTY TRANSACTIONS - MISA Agreements (Narrative) (Details) - MISA - Related Party
ر.س in Millions, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Feb. 28, 2022
Mar. 31, 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   $ (24.3) (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   (50.1) (35.0)      
Government Grant | Other Noncurrent Liabilities            
Related Party Transaction [Line Items]            
Related party transaction, amount of transaction   $ 47.4 62.5   $ 64.0  
Government Grant | Other Noncurrent Assets            
Related Party Transaction [Line Items]            
Related party transaction, amount of transaction     $ 64.0