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Employee Defined Benefit Plans - Schedule of Major Categories of Plan Assets, Measured at Fair Value (Details) - CAD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Disclosure of fair value of plan assets [Line Items]
Cash and cash equivalents	$ 28.4	$ 26.7
Fair value of plan assets	442.0	459.3
Level 1
Disclosure of fair value of plan assets [Line Items]
Equities	5.8	18.7
Fixed income, corporate bonds, and gilts	84.4	71.0
Pooled fund liability-driven investments	113.8	118.2
Alternatives and property funds	1.9	2.5
Level 2 and 3 of fair value hierarchy
Disclosure of fair value of plan assets [Line Items]
Annuity policies	$ 207.7	$ 222.2

X

- Definition

The amount cash and cash equivalents contribute to the fair value of defined benefit plan assets. [Refer: Cash and cash equivalents; Plan assets, at fair value; Defined benefit plans [domain]]

+ References

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- Definition

The amount instruments representing debt (rather than equity) contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [domain]]

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- Definition

The amount instruments representing equity (rather than debt) contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [domain]]

+ References

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- Definition

The amount investment funds contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [domain]; Investment funds [member]]

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-Name IAS
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- Definition

The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]]

+ References

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Annuity policies amount contributed to fair value of plan assets.

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Pooled fund liability driven investments amount contributed to fair value of plan assets.

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