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Income Taxes - Summary of Major Components of Deferred Income Tax (Recovery) Expense (Detail) CAD in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017 CAD	Dec. 31, 2017 USD ($)	Dec. 31, 2016 CAD
Major components of tax expense (income) [abstract]
Origination and reversal of timing differences	CAD 16.4		CAD 12.7
Change of tax rates	0.6		(1.9)
Unrecognized tax losses and temporary differences	0.4		1.8
Recovery arising from previously unrecognized tax assets	(1.6)
Revaluation due to US tax reform	(12.6)	$ (9.9)
Disposition of a subsidiary	(29.6)
Total deferred income tax (recovery) expense	CAD (26.4)		CAD 12.6

X

- Definition

Adjustments of tax expense (income) recognised in the period for the deferred tax of prior periods.

+ References

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- Definition

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

+ References

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The amount of deferred tax expense or income relating to the creation or reversal of temporary differences. [Refer: Temporary differences [member]; Deferred tax expense (income)]

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The amount of deferred tax expense or income relating to tax rate changes or the imposition of new taxes. [Refer: Deferred tax expense (income)]

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- Definition

Deferred tax expense income relating to disposition of subsidiary.

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Deferred tax expense income relating to transition tax related to tax reform.

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- Definition

Deferred tax expense income unrecognised tax loss and temporary difference.

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No definition available.

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