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Employee Defined Benefit Plans - Schedule of Quantitative Sensitivity Analyses Impact on Defined Benefit Obligation for Significant Assumptions (Details) - CAD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Change in discount rate by 0.25%
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Increase	$ (12.8)	$ (13.8)
Decrease	$ 13.2	14.3
Percentage of increase	0.25%
Percentage of decrease	0.25%
Change in pre-retirement inflation rate by 0.25%
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Increase	$ 2.2	2.4
Decrease	$ (2.2)	(2.4)
Percentage of increase	0.25%
Percentage of decrease	0.25%
Change in pension increase assumption by 0.25%
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Increase	$ 6.7	7.5
Decrease	$ (6.6)	(7.4)
Percentage of increase	0.25%
Percentage of decrease	0.25%
Change in one year in the life expectancy
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Increase	$ 12.0	13.5
Decrease	$ (12.0)	$ (13.5)

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The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [domain]]

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The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [domain]]

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