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FREIGHT RECEIVABLES (Details 1) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of financial assets [line items]      
Balance at begining of period $ 0.5 $ 0.2  
Balance at end of period 0.0 0.5 $ 0.2
Accumulated impairment      
Disclosure of financial assets [line items]      
Balance at begining of period 2.6 1.7 0.0
Addition from business combinations 0.0 0.0 1.9
Provisions for the year 0.6 1.9 0.5
Provisions reversed during the year (1.9) (1.0) (0.7)
Balance at end of period $ 1.3 $ 2.6 $ 1.7