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Material accounting policies - Vessels, property, plant and equipment (Details)
 1 Months Ended 12 Months Ended
Dec. 30, 2019
vessel
Nov. 30, 2020
Dec. 31, 2023
$ / t
vessel
Disclosure of detailed information about property, plant and equipment [line items]      
Extension term of contract   10 years  
Estimated scrap value per LDT (in USD per Tonne) | $ / t     390
Sale and leaseback agreement      
Disclosure of detailed information about property, plant and equipment [line items]      
Number of bareboat-in vessels | vessel 3   3
tankers      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful life     20 years
FSO/FPSO      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful life     30 years
FSOs      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful life     30 years
Extension term of contract     10 years
plant and equipment | Minimum      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful life     5 years
plant and equipment | Maximum      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful life     20 years
fixtures and fittings | Minimum      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful life     5 years
fixtures and fittings | Maximum      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful life     10 years
other tangible assets | Minimum      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful life     3 years
other tangible assets | Maximum      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful life     20 years
dry-docking | Minimum      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful life     2 years 6 months
dry-docking | Maximum      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful life     5 years