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Significant accounting policies - Term of leases in which the Group is engaged (Details)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Vessels | Minimum [Member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Lease term (in years) 1 year 1 year
Vessels | Maximum [Member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Lease term (in years) 6 years 6 years
Containers | Minimum [Member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Lease term (in years) 1 year 1 year
Containers | Maximum [Member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Lease term (in years) 13 years 13 years
Buildings, vehicles and other assets | Minimum [Member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Lease term (in years) 1 year 1 year
Buildings, vehicles and other assets | Maximum [Member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Lease term (in years) 8 years 8 years