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Commitments and contingencies - Narrative (Details) - t
t in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Purchase commitment of methanol supply | Within one year    
Disclosure of associates [line items]    
Purchase commitments (in tonnes) 0.9  
Purchase commitment of methanol supply | Thereafter    
Disclosure of associates [line items]    
Purchase commitments (in tonnes) 1.1  
Atlas Joint Venture    
Disclosure of associates [line items]    
Percentage of marketing rights in production 100.00%  
Percentage of ownership interest in associates 63.10% 63.10%
Atlas Joint Venture | Trinidad    
Disclosure of associates [line items]    
Percentage of ownership interest in associates 63.10%  
Atlas Joint Venture | Egypt    
Disclosure of associates [line items]    
Percentage of ownership interest in associates 50.00%  
Atlas Plant and Egypt Plant | Purchase commitment of methanol supply    
Disclosure of associates [line items]    
Purchase commitments (in tonnes) 1.3