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Financial risk management - Liquidity risks (Details) - USD ($)
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Financial Instruments [Abstract]      
Cash and cash equivalents $ 857,747,000 $ 932,069,000 $ 833,841,000
Carrying amount      
Lease obligations 870,163,000 717,101,000 $ 722,234,000
Other long-term liabilities 134,603,000 193,749,000  
Long-term debt 2,151,513,000 2,158,192,000  
Cash flow hedges (note 19) 6,739,000 60,098,000  
Financial liabilities 3,714,666,000 3,624,851,000  
Liquidity risk      
Carrying amount      
Trade and other payables 641,338,000    
Lease obligations 870,163,000    
Other long-term liabilities 28,514,000    
Long-term debt 2,151,513,000    
Cash flow hedges (note 19) 8,466,000    
Financial liabilities 3,699,994,000    
Contractual cash flows      
Trade and other payables 641,338,000    
Lease obligations 1,151,979,000    
Other long-term liabilities 55,548,000    
Long-term debt 3,057,230,000    
Cash flow hedges 9,182,000    
Financial liabilities 4,915,277,000    
Liquidity risk | 1 year or less      
Contractual cash flows      
Trade and other payables 641,338,000    
Lease obligations 156,807,000    
Other long-term liabilities 2,200,000    
Long-term debt 126,373,000    
Cash flow hedges 2,050,000    
Financial liabilities 928,768,000    
Liquidity risk | 1-3 years      
Contractual cash flows      
Trade and other payables 0    
Lease obligations 264,936,000    
Other long-term liabilities 4,400,000    
Long-term debt 533,974,000    
Cash flow hedges 7,132,000    
Financial liabilities 810,442,000    
Liquidity risk | 3-5 years      
Contractual cash flows      
Trade and other payables 0    
Lease obligations 206,710,000    
Other long-term liabilities 4,400,000    
Long-term debt 915,014,000    
Cash flow hedges 0    
Financial liabilities 1,126,124,000    
Liquidity risk | Thereafter      
Contractual cash flows      
Trade and other payables 0    
Lease obligations 523,526,000    
Other long-term liabilities 44,548,000    
Long-term debt 1,481,869,000    
Cash flow hedges 0    
Financial liabilities 2,049,943,000    
Revolving credit facility      
Disclosure of financial liabilities [line items]      
Undrawn credit facility 300,000,000 300,000,000  
Geismar 3 construction facility      
Disclosure of financial liabilities [line items]      
Undrawn credit facility $ 300,000,000 $ 600,000,000