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Property, plant and equipment - Narrative (Details) $ in Thousands |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended |  |
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Dec. 02, 2024 USD ($) ton T | Sep. 25, 2024 USD ($) ton T | Mar. 15, 2024 USD ($) | Dec. 31, 2023 USD ($) vessel T | Nov. 08, 2023 USD ($) T | Nov. 11, 2021 USD ($) | Dec. 31, 2024 USD ($) vessel T twenty-footEquivalent | Sep. 30, 2024 USD ($) | Jun. 30, 2024 USD ($) | Mar. 31, 2024 USD ($) vessel | Dec. 31, 2024 USD ($) vessel T twenty-footEquivalent | Dec. 31, 2023 USD ($) vessel T | Dec. 31, 2022 USD ($) vessel | Oct. 09, 2023 USD ($) vessel shareholder | Dec. 31, 2021 USD ($)
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Book Value |  |  |  | $ 1,769,663 |  |  | $ 3,271,084 |  |  |  | $ 3,271,084 | $ 1,769,663 | $ 3,308,616 |  | $ 3,179,299
Borrowing costs capitalised |  |  |  |  |  |  |  |  |  |  | 23,700 |  |  |  |
Proceeds from the sale of vessels (Note 8) |  |  |  |  |  |  |  |  |  |  | 1,718,862 | 1,206,636 | 356,730 |  |
Non-current assets or disposal groups classified as held for sale |  |  |  | 871,876 |  |  | 165,583 |  |  |  | 165,583 | 871,876 | 18,459 |  |
Capital commitments |  |  |  | 623,800 |  |  | 2,400,000 |  |  |  | 2,400,000 | 623,800 |  |  |
CMB.TECH NV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Borrowing costs capitalised |  |  |  |  |  |  |  |  |  |  | $ 6,800 | 6,500 |  |  |
Capitalisation rate of borrowing costs eligible for capitalisation |  |  |  |  |  |  |  |  |  |  | 7.00% |  |  |  |
CMB.TECH Enterprises NV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing costs capitalised |  |  |  |  |  |  |  |  |  |  | $ 16,800 |  |  |  |
Vessels | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Book Value |  |  |  | $ 1,629,570 |  |  | 2,617,484 |  |  |  | 2,617,484 | $ 1,629,570 | $ 3,057,932 |  | 2,967,787
Capital commitments |  |  |  |  |  |  | $ 2,423,285 |  |  |  | $ 2,423,285 |  |  |  |
Vessels | VLCCs Cassius, Camus and Clovis | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Number of properties transferred from construction in progress | vessel |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |
Number of vessels under construction | vessel |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |
Vessels | Cassius - Sale | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Property plant and equipment, boat carrying capacity | T |  |  |  | 299,158 |  |  |  |  |  |  |  | 299,158 |  |  |
Gain |  |  |  |  |  |  |  |  |  |  |  | $ 31,865 |  |  |
Vessels | Camus | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Property plant and equipment, boat carrying capacity | T |  |  |  | 299,158 |  |  |  |  |  |  |  | 299,158 |  |  |
Vessels | Eco-Type VLCC Chelsea | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Property plant and equipment, boat carrying capacity | T |  |  |  | 299,158 |  |  |  |  |  |  |  | 299,158 |  |  |
Vessels | Brugge | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Property plant and equipment, boat carrying capacity | T |  |  |  | 156,851 |  |  |  |  |  |  |  | 156,851 |  |  |
Vessels | Brest | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Property plant and equipment, boat carrying capacity | T |  |  |  | 156,851 |  |  |  |  |  |  |  | 156,851 |  |  |
Vessels | Newton - Sale | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Property plant and equipment, boat carrying capacity | T |  |  |  | 307,284 |  |  | 307,284 |  |  |  | 307,284 | 307,284 |  |  |
Acquisitions |  |  |  | $ 30,000 |  |  |  |  |  |  |  |  |  |  |
Gain |  |  |  |  |  |  |  |  |  |  | $ 20,670 |  |  |  |
Vessels | Suezmax Bristol | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property plant and equipment, boat carrying capacity | T |  |  |  |  |  |  | 156,851 |  |  |  | 156,851 |  |  |  |
Vessels | Newcastlemax Mineral France | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Property plant and equipment, boat carrying capacity | T |  |  |  |  |  |  | 210,000 |  |  |  | 210,000 |  |  |  |
Vessels | Bochem Casablanca | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Property plant and equipment, boat carrying capacity | T |  |  |  |  |  |  | 25,000 |  |  |  | 25,000 |  |  |  |
Vessels | CMA CGM Baikal - Sale | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Gain |  |  |  |  |  |  |  |  | $ 15,600 |  | $ 15,621 |  |  |  |
Proceeds from the sale of vessels (Note 8) |  |  |  |  |  | $ 71,500 |  |  |  |  |  |  |  |  |
Vessels | Newcastlemax Mineral Deutschland | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Property plant and equipment, boat carrying capacity | T |  |  |  |  |  |  | 210,000 |  |  |  | 210,000 |  |  |  |
Vessels | Bochem Shanghai | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Property plant and equipment, boat carrying capacity | T |  |  |  |  |  |  | 25,000 |  |  |  | 25,000 |  |  |  |
Vessels | Newcastlemax Mineral Italia | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Property plant and equipment, boat carrying capacity | T |  |  |  |  |  |  | 210,000 |  |  |  | 210,000 |  |  |  |
Vessels | CMA CGM Etosha | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Property plant and equipment, boat carrying capacity | T |  |  |  |  |  |  | 77,000 |  |  |  | 77,000 |  |  |  |
Vessels | Bochem New Orleans | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Property plant and equipment, boat carrying capacity | T |  |  |  |  |  |  | 25,000 |  |  |  | 25,000 |  |  |  |
Vessels | Newcastlemax Mineral Danmark | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Property plant and equipment, boat carrying capacity | T |  |  |  |  |  |  | 210,000 |  |  |  | 210,000 |  |  |  |
Vessels | Newcastlemax Mineral Eire | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Property plant and equipment, boat carrying capacity | T |  |  |  |  |  |  | 210,000 |  |  |  | 210,000 |  |  |  |
Vessels | Suezmax Helios | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Property plant and equipment, boat carrying capacity | T |  |  |  |  |  |  | 157,000 |  |  |  | 157,000 |  |  |  |
Vessels | Bochem Brisbane | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Property plant and equipment, boat carrying capacity | T |  |  |  |  |  |  | 25,000 |  |  |  | 25,000 |  |  |  |
Vessels | CMA CGM Dolomites | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Property plant and equipment, boat carrying capacity | twenty-footEquivalent |  |  |  |  |  |  | 6,000 |  |  |  | 6,000 |  |  |  |
Vessels | Newcastlemax Mineral Hellas | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Property plant and equipment, boat carrying capacity | T |  |  |  |  |  |  | 210,000 |  |  |  | 210,000 |  |  |  |
Vessels | Newcastlemax Mineral Espana | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Property plant and equipment, boat carrying capacity | T |  |  |  |  |  |  | 210,000 |  |  |  | 210,000 |  |  |  |
Vessels | Suezmax Orion | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Property plant and equipment, boat carrying capacity | T |  |  |  |  |  |  | 157,717 |  |  |  | 157,717 |  |  |  |
Vessels | Eco-type VLCCs | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Number of vessels committed to build | vessel |  |  |  |  |  |  | 5 |  |  |  | 5 |  |  |  |
Vessels | Suezmax | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Number of vessels committed to build | vessel |  |  |  |  |  |  | 2 |  |  |  | 2 |  |  |  |
Vessels | Dual-fuel Bitumen Tankers | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Number of vessels committed to build | vessel |  |  |  |  |  |  | 2 |  |  |  | 2 |  |  |  |
Vessels | Newcastlemax bulk carriers | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Number of vessels committed to build | vessel |  |  |  |  |  |  | 18 |  |  |  | 18 |  |  |  |
Vessels | Chemical tankers | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Capital commitments |  |  |  |  |  |  | $ 455,300 |  |  |  | $ 455,300 |  |  |  |
Number of vessels committed to build | vessel |  |  |  |  |  |  | 8 |  |  |  | 8 |  |  |  |
Vessels | CSOVs | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Number of vessels committed to build | vessel |  |  |  |  |  |  | 6 |  |  |  | 6 |  |  |  |
Vessels | Coaster Vessel | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Property plant and equipment, boat carrying capacity | T |  |  |  |  |  |  | 5,000 |  |  |  | 5,000 |  |  |  |
Number of vessels committed to build | vessel |  |  |  |  |  |  | 2 |  |  |  | 2 |  |  |  |
Vessels | Ammonia-powered container vessel | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Property plant and equipment, boat carrying capacity | twenty-footEquivalent |  |  |  |  |  |  | 1,400 |  |  |  | 1,400 |  |  |  |
Number of vessels committed to build | vessel |  |  |  |  |  |  | 1 |  |  |  | 1 |  |  |  |
Vessels | CTV's | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Number of vessels committed to build | vessel |  |  |  |  |  |  | 3 |  |  |  | 3 |  |  |  |
Vessels | 24 VLCC tankers | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Number of shareholders involved in transaction | shareholder |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |
Number of vessels sold | vessel |  |  |  |  |  |  |  |  |  |  |  |  |  | 24 |
Receivables from contracts with customers |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,350,000 |
Number of vessels delivered | vessel |  |  |  | 11 |  |  |  |  |  | 13 |  | 11 |  |  |
(Expected) Gain |  |  |  |  |  |  |  |  |  | $ 372,700 |  |  |  |  |
Vessels | Oceania | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Property plant and equipment, boat carrying capacity | T |  |  |  |  | 441,561 |  |  |  |  |  |  |  |  |  |
Gain |  |  |  |  |  |  |  |  |  | $ 34,800 | $ 34,826 |  |  |  |
Proceeds from the sale of vessels (Note 8) |  |  |  |  | $ 43,100 |  |  |  |  |  |  |  |  |  |
Non-current assets or disposal groups classified as held for sale |  |  |  | $ 8,300 |  |  |  |  |  |  |  | $ 8,300 |  |  |
Vessels | Noble, Nectar and Newton | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Gain |  |  | $ 79,000 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from the sale of vessels (Note 8) |  |  | $ 161,900 |  |  |  |  |  |  |  |  |  |  |  |
Vessels | Sapphira and Statia | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Number of vessels sold | ton |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Net capital gain |  |  |  |  |  |  |  | $ 61,400 |  |  |  |  |  |  |
Vessels | Sapphira - Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Property plant and equipment, boat carrying capacity | T |  |  |  |  |  |  | 150,205 |  |  |  | 150,205 |  |  |  |
Vessels | Sapphira - Sale | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Property plant and equipment, boat carrying capacity | T |  | 150,205 |  |  |  |  |  |  |  |  |  |  |  |  |
Gain |  |  |  |  |  |  |  |  |  |  | $ 30,830 |  |  |  |
Proceeds from the sale of vessels (Note 8) |  | $ 45,500 |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels | Statia - Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Property plant and equipment, boat carrying capacity | T |  |  |  |  |  |  | 150,205 |  |  |  | 150,205 |  |  |  |
Vessels | Statia - Sale | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Property plant and equipment, boat carrying capacity | T |  | 150,205 |  |  |  |  |  |  |  |  |  |  |  |  |
Gain |  |  |  |  |  |  |  |  |  |  | $ 30,527 |  |  |  |
Proceeds from the sale of vessels (Note 8) |  | $ 41,300 |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels | Selena, Cap Victor and Cap Felix | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Number of vessels sold | ton | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net capital gain |  |  |  |  |  |  | $ 71,100 |  |  |  |  |  |  |  |
Vessels | Selena - Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Property plant and equipment, boat carrying capacity | T |  |  |  |  |  |  | 150,205 |  |  |  | 150,205 |  |  |  |
Vessels | Selena - Sale | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Property plant and equipment, boat carrying capacity | T | 150,205 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain |  |  |  |  |  |  |  |  |  |  | $ 26,376 |  |  |  |
Proceeds from the sale of vessels (Note 8) | $ 38,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels | Cap Victor - Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Property plant and equipment, boat carrying capacity | T |  |  |  |  |  |  | 158,853 |  |  |  | 158,853 |  |  |  |
Vessels | Cap Victor - Sale | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property plant and equipment, boat carrying capacity | T | 158,853 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain |  |  |  |  |  |  |  |  |  |  | $ 23,397 |  |  |  |
Proceeds from the sale of vessels (Note 8) | $ 39,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels | Cap Felix - Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property plant and equipment, boat carrying capacity | T |  |  |  |  |  |  | 158,765 |  |  |  | 158,765 |  |  |  |
Vessels | Cap Felix - Sale | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property plant and equipment, boat carrying capacity | T | 158,765 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain |  |  |  |  |  |  |  |  |  |  | $ 21,341 |  |  |  |
Proceeds from the sale of vessels (Note 8) | $ 42,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels under construction | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels under construction | vessel |  |  |  | 5 |  |  | 41 |  |  |  | 41 | 5 |  |  |
Book Value |  |  |  | $ 106,513 |  |  | $ 628,405 |  |  |  | $ 628,405 | $ 106,513 | $ 228,429 |  | $ 181,293
Vessels under construction | Eco-type VLCCs | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels under construction | vessel |  |  |  |  |  |  | 5 |  |  |  | 5 |  |  |  |
Vessels under construction | Suezmax | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels under construction | vessel |  |  |  |  |  |  | 2 |  |  |  | 2 |  |  |  |
Vessels under construction | Dual-fuel Bitumen Tankers | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels under construction | vessel |  |  |  |  |  |  | 2 |  |  |  | 2 |  |  |  |
Vessels under construction | Newcastlemax bulk carriers | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels under construction | vessel |  |  |  |  |  |  | 18 |  |  |  | 18 |  |  |  |
Vessels under construction | Chemical tankers | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels under construction | vessel |  |  |  |  |  |  | 2 |  |  |  | 2 |  |  |  |
Vessels under construction | CSOVs | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels under construction | vessel |  |  |  |  |  |  | 6 |  |  |  | 6 |  |  |  |
Vessels under construction | Coaster Vessel | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property plant and equipment, boat carrying capacity | T |  |  |  |  |  |  | 5,000 |  |  |  | 5,000 |  |  |  |
Number of vessels under construction | vessel |  |  |  |  |  |  | 2 |  |  |  | 2 |  |  |  |
Vessels under construction | Ammonia-powered container vessel | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property plant and equipment, boat carrying capacity | twenty-footEquivalent |  |  |  |  |  |  | 1,400 |  |  |  | 1,400 |  |  |  |
Number of vessels under construction | vessel |  |  |  |  |  |  | 1 |  |  |  | 1 |  |  |  |
Vessels under construction | CTV's | Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels under construction | vessel |  |  |  |  |  |  | 3 |  |  |  | 3 |  |  |  |

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