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Current and long-term debt - 2023 $1.0 billion credit facility (Details) |  | 1 Months Ended | 12 Months Ended
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Dec. 31, 2024 USD ($) vessel | Dec. 31, 2025 USD ($) vessel | Nov. 30, 2025 USD ($) | Oct. 31, 2025 USD ($) | Sep. 30, 2025 USD ($) | Jul. 31, 2025 USD ($) | Oct. 31, 2024 USD ($) | Jun. 30, 2024 USD ($) tanker | Jan. 31, 2024 USD ($) vessel | Dec. 31, 2023 USD ($) tanker | Nov. 30, 2023 USD ($) tanker | Sep. 30, 2023 USD ($) | Aug. 31, 2023 USD ($) tanker | Jul. 31, 2023 USD ($) tanker | Dec. 31, 2025 USD ($) vessel
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels | vessel |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  | 1
Undrawn borrowing facilities |  | $ 783,900,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ 783,900,000
Borrowings | $ 861,967,000 | 619,204,000 |  |  |  |  |  |  |  |  |  |  |  |  | 619,204,000
Gross carrying amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Drawdowns |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000,000
Borrowings | $ 877,993,000 | $ 628,428,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ 628,428,000
Vessels |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels | vessel | 99 | 93 |  |  |  |  |  |  |  |  |  |  |  |  | 93
2023 $1.0 Billion Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000.0 |
Repayments |  |  |  |  |  |  |  | $ 223,600,000 |  |  |  |  |  |  |
Number of periodic principal payments | tanker |  |  |  |  |  |  |  | 8 |  |  |  |  |  |  |
Accelerated amortisation of deferred financing fees due to early repayment |  |  | $ 1,800,000 |  |  |  |  | $ 3,900,000 |  |  |  |  |  |  |
Net debt to capitalization ratio |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.65 |
Consolidated tangible net worth |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,500,000,000 |
Minimum ratio for fair value of vessels |  |  |  |  |  |  |  |  |  |  |  |  |  | 140.00% |
Undrawn borrowing facilities |  |  |  |  |  |  | $ 288,200,000 |  |  |  |  |  |  |  |
Undrawn commitment fee |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.78% |
Prepayment of debt |  |  | 92,100,000 |  |  |  |  |  |  |  |  |  |  |  |
2023 $1.0 Billion Credit Facility | Gross carrying amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Drawdowns |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0
Borrowings | $ 351,213,000 | $ 213,593,000 |  |  |  |  |  |  |  |  |  |  |  |  | 213,593,000
2023 $1.0 Billion Credit Facility | Consolidated Liquidity Requirement - Scenario One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Covenant liquidity requirement amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000,000.0 |
2023 $1.0 Billion Credit Facility | Consolidated Liquidity Requirement - Scenario Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liquidity requirement, per each owned ship |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000 |
Liquidity requirement, per each chartered-in ship |  |  |  |  |  |  |  |  |  |  |  |  |  | 250,000 |
2023 $1.0 Billion Credit Facility | Top of range |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Periodic borrowing payment amount | $ 11,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
2023 $1.0 Billion Credit Facility | Repayment Period One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Periodic borrowing payment amount |  |  |  |  |  |  |  |  |  |  |  |  |  | 600,000 |
2023 $1.0 Billion Credit Facility | Repayment Period Two | Bottom of range |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Periodic borrowing payment amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,400,000 |
2023 $1.0 Billion Credit Facility | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustment to interest rate basis |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.95% |
2023 $1.0 Billion Credit Facility | Vessels |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Drawdowns |  |  |  |  |  |  |  |  | $ 99,000,000.0 |  |  |  |  |  |
Repayments |  |  |  |  |  |  |  |  |  |  |  | $ 288,200,000 |  |  |
Twenty Twenty Three $1.0 Billion Credit Facility, Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepayment of debt |  |  | 84,500,000 |  |  |  |  |  |  |  |  |  |  |  |
2023 $1.0 Billion Credit Facility, Revolver |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepayment of debt |  |  | $ 7,600,000 |  |  |  |  |  |  |  |  |  |  |  |
2023 $1.0 Billion Credit Facility, Revolver | Gross carrying amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Undrawn borrowing facilities |  | 254,900,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ 254,900,000
Twenty One Vessels | 2023 $1.0 Billion Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Drawdowns |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 440,600,000 |
Number of vessels | tanker |  |  |  |  |  |  |  |  |  |  |  |  |  | 21 |
STI Supreme, STI Spiga, STI Kingsway, STI Sloane, STI Condotti | 2023 $1.0 Billion Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Drawdowns |  |  |  |  |  |  |  |  |  |  |  |  | $ 135,800,000 |  |
Number of vessels | tanker |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |
STI Lotus, STI Lily, STI Gladiator, STI Gratitude, STI Goal, STI Maximus, STI Leblon and STI Bosphorous | 2023 $1.0 Billion Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Drawdowns |  |  |  |  |  |  |  |  |  |  | $ 202,300,000 |  |  |  |
Number of vessels | tanker |  |  |  |  |  |  |  |  |  |  | 8 |  |  |  |
STI Donald C Trauscht, STI Esles II, STI Stability, STI Solace and STI Solidarity | 2023 $1.0 Billion Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Drawdowns |  |  |  |  |  |  |  |  |  | $ 122,300,000 |  |  |  |  |
Number of vessels | tanker |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |
STI Acton and STI Camden | 2023 $1.0 Billion Credit Facility | Handymax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels | vessel |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
STI Jardins, STI San Telmo, STI Soho and STI Osceola | 2023 $1.0 Billion Credit Facility | MR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels | vessel |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |
STI Lily | 2023 $1.0 Billion Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments |  |  |  |  |  |  | 22,900,000 |  |  |  |  |  |  |  |
STI Lily | 2023 $1.0 Billion Credit Facility | Vessels |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepayment of debt |  |  |  |  |  |  | 22,900,000 |  |  |  |  |  |  |  |
STI Lily | Twenty Twenty Three $1.0 Billion Credit Facility, Term Loan | Vessels |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepayment of debt |  |  |  |  |  |  | 7,600,000 |  |  |  |  |  |  |  |
STI Lily | 2023 $1.0 Billion Credit Facility, Revolver | Vessels |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepayment of debt |  |  |  |  |  |  | 15,400,000 |  |  |  |  |  |  |  |
STI Bosphorus | 2023 $1.0 Billion Credit Facility | Vessels |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepayment of debt |  |  |  |  |  | $ 12,700,000 |  |  |  |  |  |  |  |  |
STI Bosphorus | Twenty Twenty Three $1.0 Billion Credit Facility, Term Loan | Vessels |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepayment of debt |  |  |  |  |  | 3,500,000 |  |  |  |  |  |  |  |  |
STI Bosphorus | 2023 $1.0 Billion Credit Facility, Revolver | Vessels |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepayment of debt |  |  |  |  |  | $ 9,200,000 |  |  |  |  |  |  |  |  |
STI Maestro | 2023 $1.0 Billion Credit Facility | Vessels |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments |  |  |  |  | $ 5,100,000 |  |  |  |  |  |  |  |  |  |
Prepayment of debt |  |  |  |  |  |  | $ 5,100,000 |  |  |  |  |  |  |  |
STI Maestro | 2023 $1.0 Billion Credit Facility, Revolver | Vessels |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in amount available under revolving portion of facility |  |  |  |  | $ 10,200,000 |  |  |  |  |  |  |  |  |  |
STI Lobelia | Twenty Twenty Three $1.0 Billion Credit Facility, Term Loan | Vessels |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepayment of debt |  |  |  | $ 14,000,000.0 |  |  |  |  |  |  |  |  |  |  |
STI Lobelia | 2023 $1.0 Billion Credit Facility, Revolver | Vessels |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in amount available under revolving portion of facility |  |  |  | $ 30,700,000 |  |  |  |  |  |  |  |  |  |  |
STI Goal | 2023 $1.0 Billion Credit Facility | Vessels |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments |  | 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Prepayment of debt |  | 13,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |
STI Goal | Twenty Twenty Three $1.0 Billion Credit Facility, Term Loan | Vessels |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepayment of debt |  | 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
STI Goal | 2023 $1.0 Billion Credit Facility, Revolver | Vessels |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments |  | 13,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Prepayment of debt |  | $ 13,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |

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