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Income Taxes - Summary of Major Components of Deferred Income Tax (Recovery) Expense (Detail) CAD in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2017 CAD | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CAD
Major components of tax expense (income) [abstract] |  |  |
Origination and reversal of timing differences | CAD 16.4 |  | CAD 12.7
Change of tax rates | 0.6 |  | (1.9)
Unrecognized tax losses and temporary differences | 0.4 |  | 1.8
Recovery arising from previously unrecognized tax assets | (1.6) |  |
Revaluation due to US tax reform | (12.6) | $ (9.9) |
Disposition of a subsidiary | (29.6) |  |
Total deferred income tax (recovery) expense | CAD (26.4) |  | CAD 12.6

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- Definition Adjustments of tax expense (income) recognised in the period for the deferred tax of prior periods. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 80 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_80&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of tax expense (income) relating to changes in deferred tax liabilities and deferred tax assets. [Refer: Deferred tax assets; Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_g_ii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of deferred tax expense or income relating to the creation or reversal of temporary differences. [Refer: Temporary differences [member]; Deferred tax expense (income)] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 80 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_80_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of deferred tax expense or income relating to tax rate changes or the imposition of new taxes. [Refer: Deferred tax expense (income)] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 80 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_80_d&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Deferred tax expense income relating to disposition of subsidiary. + References No definition available. + Details
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- Definition Deferred tax expense income relating to transition tax related to tax reform. + References No definition available. + Details
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- Definition Deferred tax expense income unrecognised tax loss and temporary difference. + References No definition available. + Details
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