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ACCOUNTING POLICIES, CRITICAL ACCOUNTING ESTIMATES AND JUDGEMENTS - Additional information (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
segment
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Disclosure Of Accounting Policy [Line Items]      
Cash $ 72.0 $ 127.0 $ 134.0
Net debt 786.0    
Undrawn debt 246.0    
Borrowings obtained $ 496.0    
Net interest-bearing debt loan-to-value ratio 46.00%    
Financial interest $ 41.9 $ 39.3 $ 40.6
Number of geographical segment | segment 1    
Demurrage revenue claim percentage 95.00%    
Average period of receiving demurrage payment 100 days    
Dry Docking period every 24 and 60 months    
Vessels and capitalized dry-docking      
Disclosure Of Accounting Policy [Line Items]      
Useful Life of Assets 25 years    
Company cars      
Disclosure Of Accounting Policy [Line Items]      
Lease term 3 years    
IT equipment | Maximum      
Disclosure Of Accounting Policy [Line Items]      
Useful Life of Assets 5 years    
IT equipment | Minimum      
Disclosure Of Accounting Policy [Line Items]      
Useful Life of Assets 3 years    
Software | Maximum      
Disclosure Of Accounting Policy [Line Items]      
Useful Life of Assets 5 years    
Software | Minimum      
Disclosure Of Accounting Policy [Line Items]      
Useful Life of Assets 3 years    
Other plant and operating equipment | Maximum      
Disclosure Of Accounting Policy [Line Items]      
Useful Life of Assets 5 years    
Other plant and operating equipment | Minimum      
Disclosure Of Accounting Policy [Line Items]      
Useful Life of Assets 3 years