Supplemental Disclosures Other (Details) - CAD CAD in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Additional information [abstract]
Lease inducement	CAD (3.6)	CAD (3.6)
Onerous contract provision	2.2	(1.6)
Translation of US dollar derivatives	(0.7)	0.0
Other	CAD (2.1)	CAD (5.2)

Adjustments for non-cash items to reconcile profit (loss) to net cash flow from (used in) operating activities that the entity does not separately disclose in the same statement or note. [Refer: Profit (loss)]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 7
-IssueDate 2017-01-01
-Paragraph 20
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_20_b&doctype=Standard
-URIDate 2017-03-09

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