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Investment in associate - Key assumptions (Details) - Cash-generating unit - Atlas Methanol Company Unlimited
Dec. 31, 2023
Long-term average realized methanol price  
Disclosure of detailed information about property, plant and equipment [line items]  
Change Required for Carrying Value to Equal Recoverable Value 0.10
Production volumes  
Disclosure of detailed information about property, plant and equipment [line items]  
Change Required for Carrying Value to Equal Recoverable Value 0.15
Gas price  
Disclosure of detailed information about property, plant and equipment [line items]  
Change Required for Carrying Value to Equal Recoverable Value 0.10
Discount rate (after-tax)  
Disclosure of detailed information about property, plant and equipment [line items]  
Change Required for Carrying Value to Equal Recoverable Value 0.0800