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Provisions - Additional Information (Detail) - CAD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of Provisions [line items] |  |  |
Current year provisions |  | $ 58.0 | $ 26.9
Lease exit liability [member] |  |  |
Disclosure of Provisions [line items] |  |  |
Current year provisions | $ 12.8 |  |
Bottom of range [member] |  |  |
Disclosure of Provisions [line items] |  |  |
Cash outflows for existing provisions expected period |  | 1 year |
Top of range [member] |  |  |
Disclosure of Provisions [line items] |  |  |
Cash outflows for existing provisions expected period |  | 5 years |

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- Definition The amount of additional other provisions made. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2018-01-01 -Paragraph 84 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2018-03-01&anchor=para_84_b&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The description of the expected timing of outflows of economic benefits related to other provisions. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2018-01-01 -Paragraph 85 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2018-03-01&anchor=para_85_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Disclosure of provisions line items. + References No definition available. + Details
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- Details
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