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Discontinued Operations and Disposition of Subsidiaries - Summary of Disposition of Subsidiary (Detail) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of disposal of subsidiaries and discontinued operations [line items]
Cumulative exchange loss on translating foreign operations reclassified from equity	$ (0.1)	$ (13.8)
Disposal of major subsidiary [member]
Disclosure of disposal of subsidiaries and discontinued operations [line items]
Gross proceeds		369.1
Working capital adjustments		(15.3)
Transaction costs		(16.9)
Net proceeds from sale, net of cash sold		336.9
Net assets disposed		(268.5)
Cumulative exchange loss on translating foreign operations reclassified from equity		(13.8)
Gain on disposal of a subsidiary		$ 54.6

X

- Definition

The amount of assets, other than cash or cash equivalents, in subsidiaries or other businesses over which control is obtained or lost. [Refer: Subsidiaries [member]]

+ References

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- Definition

The increase (decrease) in working capital.

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The cash inflow from sales of investments other than investments accounted for using the equity method. [Refer: Investments accounted for using equity method; Investments other than investments accounted for using equity method]

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- Definition

The profit (loss) on disposal of investments and changes in the value of investments. [Refer: Profit (loss)]

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The amount of reclassification adjustments related to exchange differences when the financial statements of foreign operations are translated, net of tax. Reclassification adjustments are amounts reclassified to profit (loss) in the current period that were recognised in other comprehensive income in the current or previous periods. [Refer: Other comprehensive income]

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Disposal group transaction cost.

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Gross proceeds from disposal of subsidiaries.

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