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Financial risk management - Interest rate risk (Details) - Interest rate risk - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Fixed interest rate    
Disclosure of financial instruments by type of interest rate [line items]    
Long-term debt $ 2,158,192 $ 2,140,089
Reasonably possible change in risk variable, percent 1.00%  
Reasonably possible change in risk variable, impact on debt $ 155,100 185,200
Variable interest rate    
Disclosure of financial instruments by type of interest rate [line items]    
Long-term debt 0 223,283
Unsecured notes | Fixed interest rate    
Disclosure of financial instruments by type of interest rate [line items]    
Long-term debt 1,981,199 1,979,125
Other limited recourse debt facilities | Fixed interest rate    
Disclosure of financial instruments by type of interest rate [line items]    
Long-term debt 176,993 160,964
Geismar 3 construction facility | Variable interest rate    
Disclosure of financial instruments by type of interest rate [line items]    
Long-term debt 0 176,335
Egypt limited recourse debt facilities | Variable interest rate    
Disclosure of financial instruments by type of interest rate [line items]    
Long-term debt $ 0 $ 46,948