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Financial instruments - Trade and Other Receivables Reconciliation (Details)
 3 Months Ended
Sep. 30, 2022
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Financial instruments [Line Items]        
Trade and other receivables   $ 608,864,000 $ 909,740,000  
Impairment provision for doubtful receivables        
Financial instruments [Line Items]        
Total financial assets   (639,000) (202,000) $ (3,369,000)
Battery-Grade Lithium Hydroxide Monohydrate Plant        
Financial instruments [Line Items]        
Production capacity, metric tons 20,000      
Trade receivables, current        
Financial instruments [Line Items]        
Gross receivables   539,948,000 787,667,000  
Trade and other receivables   537,552,000 784,422,000  
Trade receivables, current | Impairment provision for doubtful receivables        
Financial instruments [Line Items]        
Total financial assets   (2,396,000) (3,245,000)  
Prepayments, current        
Financial instruments [Line Items]        
Gross receivables   34,521,000 75,414,000  
Trade and other receivables   33,737,000 74,630,000  
Prepayments, current | Impairment provision for doubtful receivables        
Financial instruments [Line Items]        
Total financial assets   (784,000) (784,000)  
Other receivables, current        
Financial instruments [Line Items]        
Gross receivables   25,712,000 21,209,000  
Trade and other receivables   23,063,000 18,163,000  
Other receivables, current | Impairment provision for doubtful receivables        
Financial instruments [Line Items]        
Total financial assets   (2,649,000) (3,046,000)  
Guarantee deposits        
Financial instruments [Line Items]        
Gross receivables   11,785,000 29,966,000  
Trade and other receivables   11,785,000 29,966,000  
Guarantee deposits | Impairment provision for doubtful receivables        
Financial instruments [Line Items]        
Total financial assets   0 0  
Other receivables, non-current        
Financial instruments [Line Items]        
Gross receivables   2,727,000 2,559,000  
Trade and other receivables   2,727,000 2,559,000  
Other receivables, non-current | Impairment provision for doubtful receivables        
Financial instruments [Line Items]        
Total financial assets   0 0  
Trade and other receivables        
Financial instruments [Line Items]        
Gross receivables   614,693,000 916,815,000  
Trade and other receivables   608,864,000 909,740,000  
Trade and other receivables | Impairment provision for doubtful receivables        
Financial instruments [Line Items]        
Total financial assets   $ (5,829,000) $ (7,075,000)