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Long-term debt - Narrative (Details)
 12 Months Ended
Dec. 31, 2020
USD ($)
vessel
semi-annual_payment
Dec. 31, 2019
USD ($)
Disclosure of detailed information about borrowings [line items]    
Accretion of deferred financing costs $ 3,600,000 $ 3,600,000
Debt instruments issued 29,430,000 29,849,000
Repayments of borrowings 295,917,000 388,216,000
Long-term debt $ 2,363,372,000 1,768,853,000
Egypt limited recourse debt facilities    
Disclosure of detailed information about borrowings [line items]    
Number of semi-annual principal payments | semi-annual_payment 24  
Long-term debt $ 46,948,000 75,165,000
Egypt limited recourse debt facilities | Egypt entity    
Disclosure of detailed information about borrowings [line items]    
Percentage of gas requirements (greater than) 70.00%  
Egypt limited recourse debt facilities | Bottom of range | LIBOR    
Disclosure of detailed information about borrowings [line items]    
Basis spread, percent 1.60%  
Egypt limited recourse debt facilities | Top of range | LIBOR    
Disclosure of detailed information about borrowings [line items]    
Basis spread, percent 1.90%  
Other limited recourse debt facilities    
Disclosure of detailed information about borrowings [line items]    
Long-term debt $ 160,964,000 158,026,000
Other limited recourse debt facilities | 50% owned subsidiary    
Disclosure of detailed information about borrowings [line items]    
Ownership rate 50.00%  
Other limited recourse debt facilities, 5.08% due 5.08% due September 15, 2036    
Disclosure of detailed information about borrowings [line items]    
Number of vessels to be acquired | vessel 1  
Long-term debt $ 12,839,000 0
Other limited recourse debt facilities, 5.08% due 5.08% due September 15, 2036 | 50% owned subsidiary    
Disclosure of detailed information about borrowings [line items]    
Notional amount $ 13,000,000  
Other limited recourse debt facilities, 5.08% due 5.08% due September 15, 2036 | Fixed interest rate    
Disclosure of detailed information about borrowings [line items]    
Borrowings, interest rate 5.08%  
Unsecured debt due October 15, 2027    
Disclosure of detailed information about borrowings [line items]    
Notional amount $ 700,000,000  
Borrowings, interest rate 5.125%  
Debt instruments issued $ 700,000,000  
Long-term debt $ 691,434,000 0
Unsecured debt due October 15, 2027 | Fixed interest rate    
Disclosure of detailed information about borrowings [line items]    
Borrowings, interest rate 5.125%  
Unsecured debt due March 1, 2022    
Disclosure of detailed information about borrowings [line items]    
Repayments of borrowings $ 250,000,000  
Construction facilities    
Disclosure of detailed information about borrowings [line items]    
Long-term debt 173,000,000  
Undrawn borrowing facilities $ 627,000,000 800,000,000
Debt covenant, debt to capitalization ratio 60.00%  
Revolving credit facility    
Disclosure of detailed information about borrowings [line items]    
Undrawn borrowing facilities $ 300,000,000 $ 300,000,000
Debt covenant, EBITDA to interest coverage ratio 2  
Debt covenant, debt to capitalization ratio 57.50%  
Default payment accelerated by a creditor, amount of indebtedness (or more) $ 50,000,000  
Default that permits a creditor to demand repayment, amount of indebtedness (or more) $ 50,000,000  
Revolving credit facility | Bottom of range    
Disclosure of detailed information about borrowings [line items]    
Debt covenant, EBITDA to interest coverage ratio 1.25  
Amended revolving credit facility    
Disclosure of detailed information about borrowings [line items]    
Debt covenant, debt to capitalization ratio 60.00%