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Employee Defined Benefit Obligations - Additional Information (Detail) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of defined benefit plans [line items]
Amount expected to contribute to pension plan by company	$ 19.0
Percentage of plans' assets invested in mutual funds and exchange-traded funds or held in cash		52.00%
Percentage of plans' assets held in annuity policies		24.00%
Weighted average duration of defined benefit obligation		16 years	16 years
Remeasurement (loss) gain on net employee defined benefit liability		$ (16.5)	$ (10.8)
Deferred tax related to remeasurement gains (losses) on net employee defined benefit liability		$ 3.6	2.0
Continuing Operations1[member]
Disclosure of defined benefit plans [line items]
Past service cost			4.7
Discontinued operations [member]
Disclosure of defined benefit plans [line items]
Past service cost			5.8
Defined benefit obligation [member]
Disclosure of defined benefit plans [line items]
Past service cost			$ 10.5

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The estimate of the expected contributions to be made to a defined benefit plan for the next annual reporting period. [Refer: Defined benefit plans [member]]

+ References

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- Definition

The amount of income tax relating to amounts recognised in other comprehensive income in relation to remeasurements of defined benefit plans. [Refer: Other comprehensive income; Reserve of remeasurements of defined benefit plans; Defined benefit plans [member]]

+ References

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The amount of other comprehensive income, net of tax, related to gains (losses) on remeasurements of defined benefit plans, which comprise actuarial gains and losses; the return on plan assets, excluding amounts included in net interest on the net defined benefit liability (asset); and any change in the effect of the asset ceiling, excluding amounts included in net interest on the net defined benefit liability (asset). [Refer: Other comprehensive income; Defined benefit plans [member]; Plan assets [member]; Net defined benefit liability (asset)]

+ References

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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from past service cost. Past service cost is the change in the present value of the defined benefit obligation for employee service in prior periods, resulting from a plan amendment (the introduction or withdrawal of, or changes to, a defined benefit plan) or a curtailment (a significant reduction by the entity in the number of employees covered by a plan). [Refer: Net defined benefit liability (asset); Defined benefit plans [member]]

+ References

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- Definition

The amount of post-employment benefit expense relating to defined benefit plans. [Refer: Defined benefit plans [member]]

+ References

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- Definition

The weighted average duration of a defined benefit obligation. [Refer: Weighted average [member]]

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Percentage of plan asset in annuity policies.

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Percentage of plan asset in securities or held in cash.

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