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Right of use assets and related lease liabilities - Narrative (Details) |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 26, 2019 USD ($) vessel | Nov. 30, 2023 USD ($) vessel | Apr. 30, 2022 USD ($) | Apr. 30, 2017 USD ($) agreement | Dec. 31, 2023 USD ($) vessel | Dec. 31, 2022 USD ($) vessel | Dec. 31, 2021 USD ($) vessel | Dec. 31, 2020 vessel | Jan. 31, 2019 agreement | Jan. 01, 2019
Disclosure of finance lease and operating lease by lessee [line items] |  |  |  |  |  |  |  |  |  |
Number of vessels under fixed rate bareboat charter agreements | vessel |  |  |  |  | 3 | 3 |  |  |  |
Number of vessels under variable rate bareboat charter agreements | vessel |  |  |  |  | 18 | 19 |  |  |  |
Number of vessels | vessel |  |  |  |  | 1 |  |  |  |  |
Number of vessels, purchase option exercised | vessel |  |  |  |  | 18 |  |  |  |  |
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 |  |  |
Income from subleasing right-of-use assets |  |  |  |  | 136,600,000 | 246,500,000 | $ 91,800,000 |  |  |
Trafigura transaction |  |  |  |  |  |  |  |  |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |  |  |  |  |  |  |  |  |
Monthly installments | $ 200,000 |  |  |  |  |  |  |  |  |
Prepayments | $ 18,000,000 |  |  |  |  |  |  |  |  |
Vessels are required to maintain a fair value, as determined by the average value of semi-annual appraisals from two approved third party brokers | 111.00% |  |  |  |  |  |  |  |  |
Trafigura transaction | London Interbank Offered Rate LIBOR plus margin |  |  |  |  |  |  |  |  |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |  |  |  |  |  |  |  |  |
Adjustment to interest rate basis | 3.50% |  |  |  |  |  |  |  |  |
Trafigura transaction | From the latter of the date of the Trafigura Transaction or the delivery date of the respective vessel |  |  |  |  |  |  |  |  |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |  |  |  |  |  |  |  |  |
Number of vessels | vessel | 8 |  |  |  |  |  |  |  |  |
Modified agreement period | 8 years |  |  |  |  |  |  |  |  |
Gross carrying amount |  |  |  |  |  |  |  |  |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |  |  |  |  |  |  |  |  |
Additions |  |  |  |  | 33,302,000 |  |  |  |  |
Borrowings |  |  |  |  | 1,617,439,000 | 1,948,592,000 |  |  |  |
IFRS 16 - Leases - 3 MR (See Note 6) | Gross carrying amount |  |  |  |  |  |  |  |  |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  | 0 | 21,138,000 |  |  |  |
IFRS 16 - Leases - $670.0 Million (see Note 6) |  |  |  |  |  |  |  |  |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |  |  |  |  |  |  |  |  |
Principal repayments recognized in consolidated cash flow statements |  |  |  |  | 459,100,000 |  |  |  |  |
Right-of-use assets, increase (decrease) in revaluation surplus |  |  |  |  | 4,500,000 |  |  |  |  |
Increase (decrease) in liabilities arising from financing activities |  |  |  |  | 4,500,000 |  |  |  |  |
IFRS 16 - Leases - $670.0 Million (see Note 6) | Gross carrying amount |  |  |  |  |  |  |  |  |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  | $ 0 | $ 475,939,000 |  |  |  |
MR |  |  |  |  |  |  |  |  |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |  |  |  |  |  |  |  |  |
Weighted average lessee's incremental borrowing rate applied to lease liabilities recognised at date of initial application of IFRS 16 |  |  |  |  |  |  |  |  |  | 6.00%
MR | Trafigura transaction |  |  |  |  |  |  |  |  |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |  |  |  |  |  |  |  |  |
Prepayments | $ 800,000 |  |  |  |  |  |  |  |  |
MR | Bareboat chartered-in product tankers | STI Beryl, STI Le Rocher and STI Larvotto |  |  |  |  |  |  |  |  |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |  |  |  |  |  |  |  |  |
Number of vessels | agreement |  |  |  | 3 |  |  |  |  | 3 |
LR2 | Trafigura transaction |  |  |  |  |  |  |  |  |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |  |  |  |  |  |  |  |  |
Prepayments | $ 1,500,000 |  |  |  |  |  |  |  |  |
Vessels |  |  |  |  |  |  |  |  |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |  |  |  |  |  |  |  |  |
Number of vessels | vessel |  |  |  |  | 111 | 113 |  |  |  |
Vessels | STI Beryl, STI Le Rocher and STI Larvotto |  |  |  |  |  |  |  |  |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |  |  |  |  |  |  |  |  |
Sale leaseback transaction, deposit per vessel |  |  |  |  | $ 4,350,000 |  |  |  |  |
Number of vessels, purchase option exercised | vessel |  | 3 |  |  |  |  |  |  |  |
Accretion gain on lease deposits |  |  |  |  | 600,000 | $ 600,000 |  |  |  |
Vessels | Leasehold interest | Trafigura transaction |  |  |  |  |  |  |  |  |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |  |  |  |  |  |  |  |  |
Number of vessels | 19 |  |  |  |  |  |  |  |  |
Vessels | Gross carrying amount |  |  |  |  |  |  |  |  |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |  |  |  |  |  |  |  |  |
Additions |  |  |  |  | $ 33,302,000 |  |  |  |  |
Vessels | IFRS 16 - Leases - 3 MR (See Note 6) | STI Beryl, STI Le Rocher and STI Larvotto |  |  |  |  |  |  |  |  |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |  |  |  |  |  |  |  |  |
Increase through new leases, liabilities arising from financing activities |  | $ 28,800,000 |  |  |  |  |  |  |  |
Additions |  | 28,800,000 |  |  |  |  |  |  |  |
Accretion gain on lease deposits |  | 1,000,000 |  |  |  |  |  |  |  |
Lease payments, daily rate |  | $ 13,100,000 |  |  |  |  |  |  |  |
Vessels | IFRS 16 - Leases - $670.0 Million (see Note 6) | STI Majestic |  |  |  |  |  |  |  |  |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |  |  |  |  |  |  |  |  |
Principal repayments recognized in consolidated cash flow statements |  |  | $ 25,600,000 |  |  |  |  |  |  |
Vessels | MR |  |  |  |  |  |  |  |  |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |  |  |  |  |  |  |  |  |
Number of vessels | vessel |  |  |  |  |  |  | 13 | 13 |  |
Vessels | MR | STI Beryl, STI Le Rocher and STI Larvotto |  |  |  |  |  |  |  |  |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |  |  |  |  |  |  |  |  |
Leaseback, daily rate |  |  |  | $ 8,800 |  |  |  |  |  |
Sale leaseback transaction, deposit per vessel |  |  |  | $ 4,400,000 |  |  |  |  |  |
Sale and leaseback, term of lease |  |  |  | 8 years |  |  |  |  |  |

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