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Discontinued Operations and Disposition of Subsidiaries - Summary of Disposition of Subsidiary (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure of disposal of subsidiaries and discontinued operations [line items] |  |
Cumulative exchange loss on translating foreign operations reclassified from equity | $ (0.1) | $ (13.8)
Disposal of major subsidiary [member] |  |
Disclosure of disposal of subsidiaries and discontinued operations [line items] |  |
Gross proceeds |  | 369.1
Working capital adjustments |  | (15.3)
Transaction costs |  | (16.9)
Net proceeds from sale, net of cash sold |  | 336.9
Net assets disposed |  | (268.5)
Cumulative exchange loss on translating foreign operations reclassified from equity |  | (13.8)
Gain on disposal of a subsidiary |  | $ 54.6

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- Definition The amount of assets, other than cash or cash equivalents, in subsidiaries or other businesses over which control is obtained or lost. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Paragraph 40 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_40_d&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The increase (decrease) in working capital. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Paragraph 20 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_20&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of reclassification adjustments related to exchange differences when the financial statements of foreign operations are translated, net of tax. Reclassification adjustments are amounts reclassified to profit (loss) in the current period that were recognised in other comprehensive income in the current or previous periods. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 21 -IssueDate 2018-01-01 -Paragraph 48 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=21&date=2018-03-01&anchor=para_48&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 92 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_92&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Disclosure of disposal of subsidiaries and discontinued operations. + References No definition available. + Details
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