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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
	Dec. 31, 2019	Dec. 31, 2018
Major components of tax expense (income) [abstract]
Origination and reversal of timing differences	$ 12.9	$ (1.9)
Unrecognized tax losses and temporary differences	7.8	2.7
Change of tax rates	(1.0)	(0.1)
Recovery arising from previously unrecognized tax assets	(4.6)	(0.2)
Total deferred income tax expense	$ 15.1	$ 0.5

X

- Definition

The amount of deferred tax expense arising from the write-down, or reversal of a previous write-down, of a deferred tax asset. [Refer: Deferred tax assets]

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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]

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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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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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