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Share Capital - Additional Information (Detail) - CAD ($) $ in Millions			12 Months Ended
	Nov. 13, 2018	Nov. 11, 2018	Dec. 31, 2018	Dec. 31, 2017
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	2,273,879
Shares Repurchased for cancellation			2,470,560	465,713
Shares repurchased for cancellation			$ 76.7	$ 14.4
Reduction in share capital			19.1	3.6
Reduction in share capital and contributed surplus accounts			0.5	0.0
Charges to retained earnings			57.1	10.8
Share-based compensation expense			5.3	9.5
Expense related to fair value of options granted			5.6	4.9
Expense related to amortization of fair value of options granted			0.3	4.6
Dividends declared included in trade and other payables			$ 15.4	$ 14.3

X

- Definition

The amount of treasury stock cancelled during the period. [Refer: Treasury shares]

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The amount of dividends that the company has declared but not yet paid.

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The amount of expense from share-based payment transactions with employees.

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The explanation of the fact that shares have no par value. [Refer: Par value per share]

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The decrease in equity resulting from a reduction in issued capital. [Refer: Issued capital]

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Charges to retained earnings.

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Expense related to fair value of options granted.

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Reduction of share capital and contributed surplus.

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Shares approved in normal course issuer bid.

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Shares repurchased for cancellation.

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