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Long-term debt - Narrative (Details) | 12 Months Ended
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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% |

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