Basis of preparation and significant accounting policies (Details)	12 Months Ended
Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Vessel, drydock period	5 years
Vessels and equipment
Property, Plant and Equipment [Line Items]
Historical scrap steel index pricing period (in years)	10 years
Useful life of property, plant and equipment (in years)	25 years

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

No definition available.

Name:	us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant