OTHER DEFERRED LIABILITIES - Narrative (Details) - Operated Facilities - CAD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Cost
Disclosure of recognised finance lease as assets by lessee [line items]
Recognised finance lease as assets	$ 15.3	$ 15.3
Accumulated depreciation
Disclosure of recognised finance lease as assets by lessee [line items]
Recognised finance lease as assets	$ 4.4	$ 3.7

The amount of assets recognised by the entity, which are leased under finance leases.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2019-01-01
-Name IAS
-Number 17
-IssueDate 2017-01-01
-Paragraph 31
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2017-03-02&anchor=para_31_a&doctype=Standard&book=B
-URIDate 2017-03-09

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