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Current and long-term debt - BCFL lease financing (MR) (Details) | 1 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 30, 2023 USD ($) vessel | Apr. 30, 2020 USD ($) | Sep. 30, 2017 USD ($) optionToAcquireAdditionalProperty vessel | Dec. 31, 2023 USD ($) vessel | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Oct. 31, 2023 USD ($) | Jan. 31, 2023 USD ($) | Jan. 31, 2021 USD ($) vessel | Jul. 31, 2020 USD ($) vessel | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  | $ 1,588,290,000 | $ 1,436,224,000 |  |  |  |  |  |  |
Principal repayments recognized in consolidated cash flow statements |  |  |  | $ 516,127,000 | 79,502,000 | $ 56,729,000 |  |  |  |  |  |
Number of vessels, purchase option exercised | vessel |  |  |  | 18 |  |  |  |  |  |  |  |
Purchase option fees |  |  |  |  |  |  | $ 1,700,000 | $ 1,200,000 |  |  |  |
Sellers credit on sale leaseback vessels |  |  |  | $ 0 | 11,430,000 |  |  |  |  |  |  |
BCFL Lease Financing (MRs) |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  | $ 21,700,000 | $ 53,200,000 |  |  |  |  |  |  |
BCFL Lease Financing (MRs) | STI Amber |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |
Principal repayments recognized in consolidated cash flow statements | $ 8,200,000 |  |  |  |  |  |  |  |  |  |  |
BCFL Lease Financing (MRs) | STI Topaz, STI Garnet, STI Onyx, STI Ruby |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels, purchase option exercised | vessel | 4 |  |  |  |  |  |  |  |  |  |  |
BCFL Lease Financing (MRs) | STI Ruby |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |
Principal repayments recognized in consolidated cash flow statements | $ 7,400,000 |  |  |  |  |  |  |  |  |  |  |
BCFL Lease Financing (MRs) | Bottom of range |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |
Deposit minimum per vessel |  |  | $ 5,100,000 |  |  |  |  |  |  |  |  |
Minimum ratio for fair value of vessels |  |  | 100.00% |  |  |  |  |  |  |  |  |
MR | BCFL Lease Financing (MRs) |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |
Finance lease daily rate per vessel |  | $ 1,910 |  |  |  |  |  |  |  |  |  |
Increase through new leases, liabilities arising from financing activities |  | $ 1,900,000 |  |  |  |  |  |  |  |  |  |
Borrowings instrument, term |  | 3 years |  |  |  |  |  |  |  |  |  |
MR | Installation of scrubbers | BCFL Lease Financing (MRs) |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels under finance lease arrangements | vessel |  |  |  |  |  |  |  |  | 3 | 1 |  |
Borrowings |  |  |  |  |  |  |  |  | $ 5,800,000 | $ 1,900,000 |  |
MR | Vessels | Bottom of range | STI Amber, STI Topaz, STI Ruby, STI Garnet and STI Onyx |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |
Sales Leaseback Transaction, Option To Purchase, Term |  |  | 5 years |  |  |  |  |  |  |  |  |
MR | Vessels | Top of range | STI Amber, STI Topaz, STI Ruby, STI Garnet and STI Onyx |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |
Sale leaseback, option to purchase period |  |  | 10 years |  |  |  |  |  |  |  |  |
MR | Vessels | BCFL Lease Financing (MRs) | STI Amber, STI Topaz, STI Ruby, STI Garnet and STI Onyx |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels under finance lease arrangements | vessel |  |  | 5 |  |  |  |  |  |  |  |  |
Sale leaseback transaction, gross proceeds per vessel |  |  | $ 27,500,000 |  |  |  |  |  |  |  |  |
Sale leaseback transaction, term |  |  | 7 years |  |  |  |  |  |  |  |  |
Finance lease daily rate per vessel |  |  |  |  |  |  |  |  |  |  |  | $ 9,025
Number of options in sale leaseback | optionToAcquireAdditionalProperty |  |  | 3 |  |  |  |  |  |  |  |  |
Sale leaseback, option term |  |  | 1 year |  |  |  |  |  |  |  |  |
Sale leaseback, deposit per vessel |  |  |  |  |  |  |  |  |  |  | $ 5,100,000 |

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