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FREIGHT RECEIVABLES - Movements in provisions for impairment of freight receivables - Movements in provisions for impairment of freight receivables (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of financial assets [line items]      
Balance at beginning of period $ 86.0 $ 71.3  
Balance at end of period 89.9 86.0 $ 71.3
Accumulated impairment      
Disclosure of financial assets [line items]      
Balance at beginning of period 1.7 1.3 2.6
Adjustment to prior years 1.5    
Provisions for the year 2.4 1.7 0.6
Provisions reversed during the year (1.9) (1.0) (1.9)
Provisions utilized during the year 0.0 (0.3) 0.0
Balance at end of period $ 3.7 $ 1.7 $ 1.3