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Share Capital - Additional Information (Detail) - CAD CAD in Millions | 12 Months Ended
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Nov. 13, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of classes of share capital [abstract] |  |  |
Description on par value of share |  | Common shares, with no par value |
Repurchase of common shares | 2,278,747 |  |
Shares Repurchased for cancellation |  | 465,713 | 572,825
Shares repurchased for cancellation |  | CAD 14.4 | CAD 18.2
Reduction in share capital |  | 3.6 |
Reduction in share capital and contributed surplus accounts |  |  | 1.9
Charges to retained earnings |  | 10.8 | 16.3
Share-based compensation expense |  | 9.5 | 8.9
Expense related to fair value of options granted |  | 4.9 | 4.4
Expense related to amortization of fair value of options granted |  | 4.6 | 4.5
Dividends declared included in trade and other payables |  | CAD 14.3 | CAD 12.8

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- Definition The amount of treasury stock cancelled during the period. [Refer: Treasury shares] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_106_d&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of dividends that the company has declared but not yet paid. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of expense from share-based payment transactions with employees. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The explanation of the fact that shares have no par value. [Refer: Par value per share] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 79 -Subparagraph a -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_79_a_iii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The decrease in equity resulting from a reduction in issued capital. [Refer: Issued capital] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_106_d&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Charges to retained earnings. + References No definition available. + Details
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- Definition Expense related to amortization of fair value of options granted. + References No definition available. + Details
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- Definition Expense related to fair value of options granted. + References No definition available. + Details
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- Definition Reduction of share capital and contributed surplus. + References No definition available. + Details
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- Definition Shares approved in normal course issuer bid. + References No definition available. + Details
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- Definition Shares repurchased for cancellation. + References No definition available. + Details
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