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VESSELS AND CAPITALIZED DRY-DOCKING - NARRATIVES (Details)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2022
USD ($)
item
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
item
Jun. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Disclosure of detailed information about property, plant and equipment [line items]          
Depreciation expense related to administrative expense $ 34.5 $ 31.5 $ 69.7 $ 62.0 $ 130.9
Profit from sale of vessels $ 0.8   $ 0.8    
Number of vessels sold during the period | item     6    
Number of vessels approved for sale | item 3   3    
Number Of Vessels Delivered To New Owner | item     3    
Number of vessels held for sale at end of reporting period | item 6   6    
Fair value of assets held for sale $ 69.2   $ 69.2   13.2
Vessels and capitalized dry docking          
Disclosure of detailed information about property, plant and equipment [line items]          
Capitalized dry-docking costs 50.6 $ 72.4 50.6 72.4 65.9
Profit from sale of vessels     0.8    
Impairment losses on tangible fixed assets     2.8    
Fair value of assets held for sale $ 69.2   69.2    
Other property, plant and equipment | Administrative expenses          
Disclosure of detailed information about property, plant and equipment [line items]          
Depreciation expense related to administrative expense     1.2 1.2 2.4
Land and buildings. | Administrative expenses          
Disclosure of detailed information about property, plant and equipment [line items]          
Depreciation expense related to administrative expense     $ 1.1 $ 1.0 $ 2.3