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Income Taxes - Summary of Major Components of Deferred Income Tax (Recovery) Expense from Continuing Operations (Detail) - CAD ($) $ in Millions		12 Months Ended
	Aug. 01, 2018	Dec. 31, 2018	Dec. 31, 2017
Major components of tax expense (income) [abstract]
Unrecognized tax losses and temporary differences		$ 2.7	$ 0.4
Origination and reversal of timing differences		(1.9)	16.3
Recovery arising from previously unrecognized tax assets		(0.2)	(1.6)
Change of tax rates		(0.1)	0.6
Revaluation due to US tax reform	$ 10.0		(12.6)
Disposition of a subsidiary			(29.5)
Total deferred income tax expense (recovery)		$ 0.5	$ (26.4)

X

- 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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- Definition

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)]

+ References

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- Definition

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

The amount of benefit arising from a previously unrecognised tax loss, tax credit or temporary difference of a prior period that is used to reduce current tax expense. [Refer: Temporary differences [member]; Unused tax losses [member]; Unused tax credits [member]]

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The amount of benefit arising from a previously unrecognised tax loss, tax credit or temporary difference of a prior period that is used to reduce deferred tax expense. [Refer: Deferred tax expense (income); Temporary differences [member]; Unused tax losses [member]; Unused tax credits [member]]

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- Definition

Deferred tax expense income relating to disposition of subsidiary.

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- Definition

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

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No definition available.

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