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Financial risk management - Liquidity risks (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Financial Instruments [Abstract]      
Cash and cash equivalents $ 833,841,000 $ 416,763,000 $ 256,077,000
Disclosure of financial liabilities [line items]      
Long-term debt 2,363,372,000 1,768,853,000  
Carrying amount      
Lease obligations 722,234,000 718,505,000 $ 652,642,000
Long-term debt 2,363,372,000 1,768,853,000  
Cash flow hedges 180,798,000 195,124,000  
Financial liabilities 3,044,800,000 2,370,617,000  
Contractual cash flows      
Cash flow hedges 214,622,000 244,304,000  
1 year or less      
Contractual cash flows      
Cash flow hedges 15,047,000 17,620,000  
1-3 years      
Contractual cash flows      
Cash flow hedges 44,841,000 45,432,000  
3-5 years      
Contractual cash flows      
Cash flow hedges 63,002,000 56,887,000  
More than 5 years      
Contractual cash flows      
Cash flow hedges 91,732,000 124,365,000  
Liquidity risk      
Disclosure of financial liabilities [line items]      
Long-term debt 2,363,372,000    
Carrying amount      
Trade and other payables 485,545,000    
Lease obligations 722,234,000    
Long-term debt 2,363,372,000    
Cash flow hedges 181,372,000    
Financial liabilities 3,752,523,000    
Contractual cash flows      
Trade and other payables 485,545,000    
Lease obligations 982,387,000    
Long-term debt 3,509,538,000    
Cash flow hedges 214,622,000    
Financial liabilities 5,192,092,000    
Liquidity risk | 1 year or less      
Contractual cash flows      
Trade and other payables 485,545,000    
Lease obligations 142,096,000    
Long-term debt 158,063,000    
Cash flow hedges 15,047,000    
Financial liabilities 800,751,000    
Liquidity risk | 1-3 years      
Contractual cash flows      
Trade and other payables 0    
Lease obligations 228,493,000    
Long-term debt 274,599,000    
Cash flow hedges 44,841,000    
Financial liabilities 547,933,000    
Liquidity risk | 3-5 years      
Contractual cash flows      
Trade and other payables 0    
Lease obligations 192,342,000    
Long-term debt 708,577,000    
Cash flow hedges 63,002,000    
Financial liabilities 963,921,000    
Liquidity risk | More than 5 years      
Contractual cash flows      
Trade and other payables 0    
Lease obligations 419,456,000    
Long-term debt 2,368,299,000    
Cash flow hedges 91,732,000    
Financial liabilities 2,879,487,000    
Revolving credit facility      
Disclosure of financial liabilities [line items]      
Undrawn credit facilities 300,000,000 300,000,000  
Construction facilities      
Disclosure of financial liabilities [line items]      
Undrawn credit facilities 627,000,000 $ 800,000,000  
Long-term debt 173,000,000    
Carrying amount      
Long-term debt $ 173,000,000