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Commitments - Additional Information (Detail) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of finance lease and operating lease by lessee [Line Items]
Commitments to purchase property, plant and equipment	$ 179.8	$ 132.9
2019 [Member]
Disclosure of finance lease and operating lease by lessee [Line Items]
Commitments to purchase property, plant and equipment	88.0
2020 [Member]
Disclosure of finance lease and operating lease by lessee [Line Items]
Commitments to purchase property, plant and equipment	73.6
2021 [Member]
Disclosure of finance lease and operating lease by lessee [Line Items]
Commitments to purchase property, plant and equipment	$ 18.2
Office equipment [member]
Disclosure of finance lease and operating lease by lessee [Line Items]
Terms of operating lease commitments	one to 10 years
Vehicles [member]
Disclosure of finance lease and operating lease by lessee [Line Items]
Terms of operating lease commitments	three and four years

X

- Definition

The amount of future capital expenditures that the entity is committed to make.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard
-URIDate 2017-03-09

+ Details

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X

- Definition

The general description of the lessee's significant leasing arrangements for operating leases including, but not limited to: (a) the basis on which contingent rent payable is determined; (b) the existence and terms of renewal or purchase options and escalation clauses; and (c) restrictions imposed by lease arrangements, such as those concerning dividends, additional debt and further leasing.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2019-01-01
-Name IAS
-Number 17
-IssueDate 2017-01-01
-Paragraph 35
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2017-03-02&anchor=para_35_d&doctype=Standard&book=B
-URIDate 2017-03-09

+ Details

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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