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Assets held for sale (Details) $ in Thousands | 1 Months Ended | 5 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2025 USD ($) vessel | Nov. 30, 2025 USD ($) | Oct. 31, 2025 USD ($) | Sep. 30, 2025 USD ($) | Oct. 31, 2024 USD ($) | Jun. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Nov. 30, 2023 USD ($) vessel | Dec. 31, 2025 USD ($) vessel | Dec. 31, 2024 USD ($) vessel | Dec. 31, 2023 USD ($) | Dec. 31, 2021 USD ($)
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings | $ 619,204 |  |  |  |  |  |  |  | $ 619,204 | $ 861,967 |  |
Property, plant and equipment | 2,741,440 |  |  |  |  |  |  |  | 2,741,440 | 3,190,820 |  |
Gain on sale of vessels |  |  |  |  |  |  |  |  | 45,486 | 176,537 | $ 12,019 |
Undrawn borrowing facilities | 783,900 |  |  |  |  |  |  |  | 783,900 |  |  |
Principal repayments recognized in consolidated cash flow statements |  |  |  |  |  |  |  |  | 0 | 0 | 516,127 |
2023 $1.0 Billion Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments |  |  |  |  |  | $ 223,600 |  |  |  |  |  |
Undrawn borrowing facilities |  |  |  |  | $ 288,200 |  |  |  |  |  |  |
2021 Ocean Yield Lease Financing |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings | 52,200 |  |  |  |  |  |  |  | 52,200 |  |  | $ 70,200
Vessels |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment | 2,613,257 |  |  |  |  |  |  |  | 2,613,257 | 3,076,506 |  |
Vessels | 2023 $1.0 Billion Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments |  |  |  |  |  |  | $ 288,200 |  |  |  |  |
STI Goal | Vessels | 2023 $1.0 Billion Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments | 300 |  |  |  |  |  |  |  |  |  |  |
STI Goal | Vessels | 2023 $1.0 Billion Credit Facility, Revolver |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments | 13,500 |  |  |  |  |  |  |  |  |  |  |
STI Gallantry | Vessels | 2021 Ocean Yield Lease Financing |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |
Principal repayments recognized in consolidated cash flow statements | 23,400 |  |  |  |  |  |  |  |  |  |  |
STI Kingsway | Vessels | 2023 $1.0 Billion Credit Facility | Non-current assets held for sale |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings | 0 |  |  |  |  |  |  |  | 0 |  |  |
STI Kingsway | Vessels | 2023 $1.0 Billion Credit Facility, Revolver | Non-current assets held for sale |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |
Reduction in amount available under revolving portion of facility | $ 13,700 |  |  |  |  |  |  |  | $ 13,700 |  |  |
STI Lobelia | Vessels | 2023 $1.0 Billion Credit Facility, Revolver |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |
Reduction in amount available under revolving portion of facility |  |  | $ 30,700 |  |  |  |  |  |  |  |  |
STI Maestro | Vessels | 2023 $1.0 Billion Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments |  |  |  | $ 5,100 |  |  |  |  |  |  |  |
STI Maestro | Vessels | 2023 $1.0 Billion Credit Facility, Revolver |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |
Reduction in amount available under revolving portion of facility |  |  |  | $ 10,200 |  |  |  |  |  |  |  |
STI Lobelia and STI Lavender | Vessels | 2023 $1.0 Billion Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments |  |  | 14,000 |  |  |  |  |  |  |  |  |
STI Lobelia and STI Lavender | Vessels | 2023 $1.0 Billion Credit Facility, Revolver |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |
Reduction in amount available under revolving portion of facility |  |  | $ 30,700 |  |  |  |  |  |  |  |  |
STI Battery, STI Venere, STI Milwaukee and STI Yorkville | Vessels | 2023 $225.0 Million Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments |  | $ 29,200 |  |  |  |  |  |  |  |  |  |
Reduction in amount available under revolving portion of facility |  | $ 12,000 |  |  |  |  |  |  |  |  |  |
STI Lily | 2023 $1.0 Billion Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments |  |  |  |  | $ 22,900 |  |  |  |  |  |  |
11 MR Vessels and STI Lily | Vessels | MR |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels sold | vessel |  |  |  |  |  |  |  |  | 11 |  |  |
Property, plant and equipment |  |  |  |  |  |  |  |  |  | 307,300 |  |
Proceeds from sale of vessels |  |  |  |  |  |  |  |  |  | 479,800 |  |
Gain on sale of vessels |  |  |  |  |  |  |  |  |  | 176,500 |  |
STI San Antonio | Vessels | MR |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |
Accrued and unpaid selling costs |  |  |  |  |  |  |  |  |  | $ 200 |  |
Sale of Vessels | Vessels |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels in agreement to sell | vessel | 22 |  |  |  |  |  |  |  | 22 |  |  |
Sale of Vessels | Eleven MR Vessels | Vessels | MR |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels in agreement to sell | vessel |  |  |  |  |  |  |  |  |  | 11 |  |
Sale of Vessels | STI Lavender, STI Goal, STI Gallantry and STI Kingsway | Vessels | LR2 | Non-current assets held for sale |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |
Number of ships held for sale | vessel | 4 |  |  |  |  |  |  |  | 4 |  |  |
Non-current assets or disposal groups classified as held for sale | $ 153,600 |  |  |  |  |  |  |  | $ 153,600 |  |  |
Sale of Vessels | STI Lavender | Vessels | LR2 | Non-current assets held for sale |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |
Ships held for sale, sales price | 61,200 |  |  |  |  |  |  |  | 61,200 |  |  |
Sale of Vessels | STI Goal | Vessels | LR2 | Non-current assets held for sale |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |
Ships held for sale, sales price | 52,300 |  |  |  |  |  |  |  | 52,300 |  |  |
Sale of Vessels | STI Gallantry | Vessels | LR2 | Non-current assets held for sale |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |
Ships held for sale, sales price | 52,300 |  |  |  |  |  |  |  | 52,300 |  |  |
Sale of Vessels | STI Kingsway | Vessels | LR2 | Non-current assets held for sale |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |
Ships held for sale, sales price | $ 57,500 |  |  |  |  |  |  |  | $ 57,500 |  |  |
Sale of Vessels | STI Maestro, STI Battery, STI Venere, STI Milwaukee and STI Yorkville | Vessels | MR |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels sold | vessel |  |  |  |  |  |  |  |  | 5 |  |  |
Number of vessels in agreement to sell | vessel | 5 |  |  |  |  |  |  |  | 5 |  |  |
Sale of Vessels | STI Lobelia | Vessels | LR2 |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels sold | vessel |  |  |  |  |  |  |  |  | 1 |  |  |
Sale of Vessels | STI Maestro, STI Battery, STI Venere, STI Milwaukee, STI Yorkville and STI Lobelia | Vessels | MR and LR2 |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment | $ 180,500 |  |  |  |  |  |  |  | $ 180,500 |  |  |
Proceeds from sale of vessels |  |  |  |  |  |  |  |  | 226,000 |  |  |
Accrued and unpaid selling costs | $ 1,900 |  |  |  |  |  |  |  | 1,900 |  |  |
Gain on sale of vessels |  |  |  |  |  |  |  |  | $ 45,500 |  |  |
Sale of Vessels | STI Amber | Vessels | MR |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments |  |  |  |  |  |  |  | $ 8,200 |  |  |  |
Sale of Vessels | STI Lily | Vessels | LR2 |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels in agreement to sell | vessel |  |  |  |  |  |  |  |  |  | 1 |  |
Sale of Vessels | STI Ville and STI Amber | Vessels | MR |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels sold | vessel |  |  |  |  |  |  |  | 2 |  |  |  |
Property, plant and equipment |  |  |  |  |  |  |  | $ 52,600 |  |  |  |
Proceeds from sale of vessels |  |  |  |  |  |  |  | 64,600 |  |  |  |
Accrued and unpaid selling costs |  |  |  |  |  |  |  |  |  |  | $ 300 |
Gain on sale of vessels |  |  |  |  |  |  |  | $ 12,000 |  |  |  |

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