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FREIGHT RECEIVABLES (Detail Textual) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of financial assets that are either past due or impaired [line items]        
Receivables individually determined to be impaired $ 86.0 $ 71.3 $ 62.5  
Accumulated impairment        
Disclosure of financial assets that are either past due or impaired [line items]        
Receivables individually determined to be impaired 1.7 1.3 2.6 $ 1.7
Financial assets individually assessed for credit losses | Accumulated impairment        
Disclosure of financial assets that are either past due or impaired [line items]        
Freight receivables included receivables 0.0 0.0 0.6  
Receivables individually determined to be impaired $ 0.0 $ 0.0 $ 0.5