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Long-term debt - Narrative (Details)
 12 Months Ended
Dec. 31, 2021
USD ($)
semi-annualPayment
vessel
Dec. 31, 2020
USD ($)
Disclosure of detailed information about borrowings [line items]    
Accretion of deferred financing costs $ 3,500,000 $ 3,600,000
Repayments of construction borrowings, classified as financing activities $ 173,000,000 0
Egypt limited recourse debt facilities    
Disclosure of detailed information about borrowings [line items]    
Number of semi-annual principal payments | semi-annualPayment 24  
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 | 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  
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 $ 25,000,000 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%  
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 60.00%  
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  
Geismar 3 construction facility    
Disclosure of detailed information about borrowings [line items]    
Undrawn borrowing facilities $ 600,000,000 $ 800,000,000
Repayments of construction borrowings, classified as financing activities $ 173,000,000  
Geismar 3 construction facility | LIBOR    
Disclosure of detailed information about borrowings [line items]    
Basis spread, percent 3.00%