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v3.20.1

Long-term debt - Narrative (Details) | 12 Months Ended
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Dec. 31, 2019 USD ($) vessel semi-annual_payment | Dec. 31, 2018 USD ($)
Disclosure of detailed information about borrowings [line items] |  |
Repayments of borrowings | $ 388,216,000 | $ 213,622,000
Accretion of deferred financing costs | 3,600,000 | 3,600,000
Debt instruments issued | $ 29,849,000 | 30,242,000
Egypt limited recourse debt facilities |  |
Disclosure of detailed information about borrowings [line items] |  |
Number of semi-annual principal payments | semi-annual_payment | 24 |
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 | Minimum | LIBOR |  |
Disclosure of detailed information about borrowings [line items] |  |
Basis spread, percent | 0.90% |
Egypt limited recourse debt facilities | Maximum | LIBOR |  |
Disclosure of detailed information about borrowings [line items] |  |
Basis spread, percent | 1.60% |
Other limited recourse debt facilities |  |
Disclosure of detailed information about borrowings [line items] |  |
Repayments of borrowings | $ 60,600,000 |
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, 5.35% due September 30, 2033 |  |
Disclosure of detailed information about borrowings [line items] |  |
Number of vessels to be acquired | vessel | 2 |
Other limited recourse debt facilities, 5.35% due September 30, 2033 | 50% owned subsidiary |  |
Disclosure of detailed information about borrowings [line items] |  |
Notional amount | $ 86,000,000 |
Other limited recourse debt facilities, 5.35% due September 30, 2033 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings, interest rate | 5.35% |
Other limited recourse debt facilities, 5.58% due June 30, 2031 |  |
Disclosure of detailed information about borrowings [line items] |  |
Notional amount | $ 80,000,000 |
Other limited recourse debt facilities, 5.58% due June 30, 2031 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings, interest rate | 5.58% |
5.25% due December 15, 2029 |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings, interest rate | 5.25% |
Debt instruments issued | $ 700,000,000 |
5.25% due December 15, 2029 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings, interest rate | 5.25% |
3.25% due December 15, 2019 |  |
Disclosure of detailed information about borrowings [line items] |  |
Repayments of borrowings | $ 350,000,000 |
3.25% due December 15, 2019 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings, interest rate | 3.25% |
Construction facilities |  |
Disclosure of detailed information about borrowings [line items] |  |
Undrawn borrowing facilities | $ 800,000,000 | 0
Revolving credit facility |  |
Disclosure of detailed information about borrowings [line items] |  |
Debt covenant, debt to capitalization ratio (less than or equal) | 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 |
Undrawn borrowing facilities | $ 300,000,000 | $ 300,000,000
Debt covenant, EBITDA to interest coverage ratio | 2 |
Revolving credit facility | Minimum |  |
Disclosure of detailed information about borrowings [line items] |  |
Debt covenant, EBITDA to interest coverage ratio | 1.25 |

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