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LEASING - Nature of the Group's leasing activities by type of right-of-use asset recognized on the balance sheet (Details)
 12 Months Ended
Dec. 31, 2019
Asset
lease
Vessels and capitalized dry-docking  
Disclosure of quantitative information about right-of-use assets [line items]  
No. of right-of-use assets leased | Asset 3
Range of remaining term 2 years
Average remaining lease term 2 years 3 months 18 days
No. of leases with options to purchase 3
No. of leases with termination options 3
Land and buildings  
Disclosure of quantitative information about right-of-use assets [line items]  
No. of right-of-use assets leased | Asset 10
Average remaining lease term 2 years 9 months 18 days
No. of leases with extension options 10
No. of leases with termination options 2
Other plant and operating equipment  
Disclosure of quantitative information about right-of-use assets [line items]  
No. of right-of-use assets leased | Asset 19
Average remaining lease term 1 year 3 months 18 days
No. of leases with extension options 19
No. of leases with termination options 10
Minimum | Land and buildings  
Disclosure of quantitative information about right-of-use assets [line items]  
Range of remaining term 0 years
Minimum | Other plant and operating equipment  
Disclosure of quantitative information about right-of-use assets [line items]  
Range of remaining term 0 years
Maximum | Land and buildings  
Disclosure of quantitative information about right-of-use assets [line items]  
Range of remaining term 9 years
Maximum | Other plant and operating equipment  
Disclosure of quantitative information about right-of-use assets [line items]  
Range of remaining term 3 years