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Employee Defined Benefit Plans - Additional Information (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Employee Benefits [Abstract]
Amount expected to be contribute in next annual reporting period	$ 8.0
Percent of defined benefit obligation was fully covered against changes in interest rates	55.60%	55.20%
Remeasurement (loss) gain on net employee defined benefit plans	$ (0.1)	$ 7.8
Deferred tax (recovery) expense on remeasurement of net employee defined benefit liability		(4.7)
Remeasurement (loss) gain, before tax		$ 3.1
Percentage of plans' assets invested in mutual funds and exchange-traded funds or held in cash	53.00%
Percentage of plans' assets held in annuity policies	47.00%
Weighted average duration of defined benefit obligation	14 years	14 years

X

- 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 [domain]]

+ 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 [domain]]

+ References

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- Definition

The amount of other comprehensive income, before 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 [domain]; Plan assets [member]; Net defined benefit liability (asset)] [Contrast: Decrease (increase) in net defined benefit liability (asset) resulting from gain (loss) on remeasurement in other comprehensive income]

+ References

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- Definition

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 [domain]; Plan assets [member]; Net defined benefit liability (asset)] [Contrast: Decrease (increase) in net defined benefit liability (asset) resulting from gain (loss) on remeasurement in other comprehensive income]

+ References

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- Definition

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

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Employee Benefits

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No definition available.

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- Definition

Percentage Of Defined Benefit Obligation Fully Covered With Annuity Policies

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Percentage of plan asset in annuity policies.

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Percentage Of Plan Asset In Securities Or Held In Mutual, Exchange-Traded, And Pooled Funds, And In Cash

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