FREIGHT RECEIVABLES (Detail Textual) - USD ($) $ in Millions	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	$ 0.0	$ 0.5	$ 0.2
Financial assets individually assessed for credit losses
Disclosure of financial assets that are either past due or impaired [line items]
Receivables individually determined to be impaired	$ 0.0	$ 0.6	$ 1.9

The amount due from customers for goods and services sold.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 78
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_78_b&doctype=Standard
-URIDate 2017-03-09

Name:	ifrs-full_TradeReceivables
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant