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Financial instruments - financial and other risks - Categories of financial instruments (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of detailed information about financial instruments [line items] |  |  |
Debt outstanding | $ 1,588,290 | $ 1,436,224 |
Convertible notes (in shares) | 0 | 5,445,455 | 0
Deferred financing fees |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Debt outstanding | $ 28,814 | $ 12,758 |
Secured bank loans | Deferred financing fees |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Debt outstanding | 24,600 | 2,800 |
Finance lease |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Debt outstanding | 3,200 | 8,200 |
Unsecured Senior Notes Due 2025 | Deferred financing fees |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Debt outstanding | 1,100 | 1,700 |
Unsecured Senior Notes Due 2025 | Unamortized discount on debt |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Debt outstanding | 100 | 100 |
Accounts payable | Financial liabilities at amortised cost, category |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial liabilities, carrying value | 10,004 | 28,748 |
Accrued expenses and other current liabilities | Financial liabilities at amortised cost, category |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial liabilities, carrying value | 72,678 | 91,508 |
Secured bank loans | Financial liabilities at amortised cost, category |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial liabilities, carrying value | 1,090,741 | 226,896 |
Finance lease | Financial liabilities at amortised cost, category |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial liabilities, carrying value | 428,137 | 1,140,614 |
Lease liabilities | Lease liabilities |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial liabilities, carrying value | 0 | 495,875 |
Unsecured Senior Notes Due 2025 | Financial liabilities at amortised cost, category |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial liabilities, carrying value | 70,571 | 70,571 |
Cash and cash equivalents | Loans and receivables, category |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets, carrying value | 355,551 | 376,870 |
Accounts receivable | Loans and receivables, category |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets, carrying value | 203,500 | 276,700 |
Seller's credit on sale leaseback vessels | Loans and receivables, category |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets, carrying value | 0 | 11,430 |
Level 1 of fair value hierarchy | Accounts payable | Financial liabilities at amortised cost, category |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial liabilities, at fair value | 10,004 | 28,748 |
Level 1 of fair value hierarchy | Accrued expenses and other current liabilities | Financial liabilities at amortised cost, category |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial liabilities, at fair value | 72,678 | 91,508 |
Level 1 of fair value hierarchy | Unsecured Senior Notes Due 2025 | Financial liabilities at amortised cost, category |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial liabilities, at fair value | 70,260 | 69,639 |
Level 1 of fair value hierarchy | Cash and cash equivalents | Loans and receivables, category |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets, at fair value | 355,551 | 376,870 |
Level 1 of fair value hierarchy | Accounts receivable | Loans and receivables, category |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets, at fair value | 203,500 | 276,700 |
Level 1 of fair value hierarchy | Seller's credit on sale leaseback vessels | Loans and receivables, category |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets, at fair value | 0 | 11,430 |
Level 2 of fair value hierarchy | Secured bank loans | Financial liabilities at amortised cost, category |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial liabilities, at fair value | 1,090,741 | 226,896 |
Level 2 of fair value hierarchy | Finance lease | Financial liabilities at amortised cost, category |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial liabilities, at fair value | 428,124 | 1,139,877 |
Level 2 of fair value hierarchy | Lease liabilities | Lease liabilities |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial liabilities, at fair value | 0 | 495,234 |
STI Beryl, STI Le Rocher and STI Larvotto | Vessels |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Sale leaseback transaction, deposit per vessel | 4,350 |  |
Sale leaseback transaction, aggregate amount | 13,100 |  |
Scorpio Pools | Working capital contributions to Scorpio Pools | Loans and receivables, category |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets, carrying value | 51,411 | 53,161 |
Scorpio Pools | Level 1 of fair value hierarchy | Working capital contributions to Scorpio Pools | Loans and receivables, category |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets, at fair value | $ 51,411 | $ 53,161 |

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