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Income Taxes - Summary of Major Components of Current Income Tax Expense from Continuing Operations (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Major components of tax expense (income) [abstract] |  |
Ongoing operations | $ 64.5 | $ 34.4
Transition tax related to US tax reform | (10.0) | 31.2
Disposition of subsidiary |  | 124.1
Reorganization of corporate structure |  | 3.2
Total current income tax expense | $ 54.5 | $ 192.9

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- Definition The amount of income taxes payable (recoverable) in respect of the taxable profit (tax loss) for a period. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 80 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_80_a&doctype=Standard -URIDate 2018-03-16 + Details
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