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Income Taxes - Summary of Major Components of Current Income Tax 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] |  |  |
On-going operations | CAD 34.4 |  | CAD 37.7
Disposition of subsidiary | 124.1 |  |
Transition tax related to US tax reform | 31.2 | $ 24.5 |
Reorganization of corporate structure | 3.2 |  |
Total current income tax expense | CAD 192.9 |  | CAD 37.7

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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 2017-01-01 -Paragraph 80 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_80_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The tax expense relating to the gain (loss) on discontinuance when operations are discontinued. [Refer: Discontinued operations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 5 -IssueDate 2017-01-01 -Paragraph 33 -Subparagraph b -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=5&date=2017-03-01&anchor=para_33_b_iv&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph h -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_h_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Tax expense relating to reorganization of corporate structure. + References No definition available. + Details
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- Definition Tax expense relating to transition tax related to tax reform. + References No definition available. + Details
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