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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 |

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- 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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- 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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- Details
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