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Current and long-term debt - 2023 $225 million credit facility (Details) | 1 Months Ended | 12 Months Ended |
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Nov. 30, 2025 USD ($) vessel | Apr. 30, 2025 USD ($) payment | Mar. 31, 2023 USD ($) tanker | Feb. 28, 2023 USD ($) | Jan. 31, 2023 USD ($) tanker | Dec. 31, 2025 USD ($) vessel | Dec. 31, 2024 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Number of vessels | vessel |  |  |  |  |  | 1 |
Borrowings |  |  |  |  |  | $ 619,204,000 | $ 861,967,000
Gross carrying amount |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Drawdowns |  |  |  |  |  | 200,000,000 |
Borrowings |  |  |  |  |  | 628,428,000 | 877,993,000
2023 $225.0 Million Revolving Credit Facility |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Loan maximum borrowing capacity |  |  |  |  |  | 29,000,000.0 |
Borrowings instrument, term |  |  |  |  | 5 years |  |
Prepayment of debt |  | $ 50,000,000.0 |  |  |  |  |
Number of quarterly installment payments | payment |  | 11 |  |  |  |  |
Net debt to capitalization ratio |  |  |  |  | 0.65 |  |
Consolidated tangible net worth |  |  |  |  | $ 1,500,000,000 |  |
Minimum ratio for fair value of vessels |  |  |  |  | 140.00% |  |
2023 $225.0 Million Revolving Credit Facility | Gross carrying amount |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Drawdowns |  |  |  |  |  | 0 |
Borrowings |  |  |  |  |  | $ 73,370,000 | $ 165,675,000
2023 $225.0 Million Revolving Credit Facility | Consolidated Liquidity Requirement - Scenario One |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Covenant liquidity requirement amount |  |  |  |  | $ 25,000,000.0 |  |
2023 $225.0 Million Revolving 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 $225.0 Million Revolving Credit Facility | MR |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Number of vessels | tanker |  |  |  |  | 11 |  |
2023 $225.0 Million Revolving Credit Facility | MR | Repayment Period One |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Periodic payment per vessel |  |  |  |  | $ 630,000 |  |
Repayment term |  |  |  |  | 2 years |  |
2023 $225.0 Million Revolving Credit Facility | MR | Repayment Period Two |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Periodic payment per vessel |  |  |  |  | $ 330,000 |  |
2023 $225.0 Million Revolving Credit Facility | LR2 |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Number of vessels | tanker |  |  |  |  | 2 |  |
2023 $225.0 Million Revolving Credit Facility | LR2 | Repayment Period One |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Periodic payment per vessel |  |  |  |  | $ 800,000 |  |
Repayment term |  |  |  |  | 2 years |  |
2023 $225.0 Million Revolving Credit Facility | LR2 | Repayment Period Two |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Periodic payment per vessel |  |  |  |  | $ 450,000 |  |
2023 $225.0 Million Revolving Credit Facility | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Adjustment to interest rate basis |  |  |  |  | 1.975% |  |
Thirteen Product Tankers | 2023 $225.0 Million Revolving Credit Facility |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Loan maximum borrowing capacity |  |  |  |  | $ 225,000,000.0 |  |
Drawdowns |  |  | $ 40,100,000 | $ 184,900,000 |  |  |
Number of vessels | tanker |  |  | 13 |  |  |  |
STI Battery, STI Venere, STI Milwaukee and STI Yorkville | 2023 $225.0 Million Revolving Credit Facility | MR |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Number of vessels | vessel | 4 |  |  |  |  |  |
Repayments of non-current borrowings | $ 29,200,000 |  |  |  |  |  |

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