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Income Taxes - Schedule of Reconciliation of Net Deferred Tax Assets (Liabilities) (Detail) - CAD CAD in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of changes in deferred tax liability (asset) [abstract]
Beginning balance	CAD (53.4)	CAD (10.0)
Tax recovery during the year recognized in net income	26.4	(12.6)
Impact of foreign exchange	1.8	(4.5)
Deferred taxes acquired through business combinations	(0.8)	(28.3)
Tax effect on other comprehensive income	(2.4)	2.9
Other	(3.0)	(0.9)
Ending balance	CAD (31.4)	CAD (53.4)

X

- Definition

The amount of tax expense or income relating to changes in deferred tax liabilities and deferred tax assets, recognised in profit or loss. [Refer: Deferred tax assets; Deferred tax expense (income); Deferred tax liabilities]

+ References

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- Definition

The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets]

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- Definition

The amount of income tax relating to amounts recognised in other comprehensive income. [Refer: Other comprehensive income]

+ References

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- Definition

The increase (decrease) in deferred tax liability (asset) resulting from business combinations. [Refer: Deferred tax liability (asset)]

+ References

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- Definition

The increase (decrease) in deferred tax liability (asset) resulting from the net exchange differences arising when the financial statements are translated from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Deferred tax liability (asset)]

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