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Employee Defined Benefit Plans - Schedule of Reconciliation for Net Defined Benefit (Asset) Liability (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Actuarial gains (losses) arising from:    
Remeasurement (loss) gain, before tax   $ (3.1)
Pension defined benefit plans    
Disclosure of net defined benefit liability (asset) [Line Items]    
Balance, beginning of the year $ 56.7 40.4
Administrative and marketing expenses    
Interest (expense) income 2.7 2.4
Administrative expenses paid by the Plans (1.9) (2.1)
Net defined benefit liability asset included in profit or loss 0.8 0.3
Other comprehensive income (loss)    
Adjustments on the plan assets, excluding interest income (57.1) 10.3
Actuarial gains (losses) arising from:    
Changes in demographic assumptions 3.0 5.8
Changes in financial assumptions 47.7 (9.6)
Experience adjustments 6.3 (3.4)
Remeasurement (loss) gain, before tax (0.1) 3.1
Effect of movement in exchange rates 4.1 1.3
Net defined benefit liability asset included in other comprehensive income 4.0 4.4
Other    
Benefits paid 0.0 0.0
Contributions by employer 7.1 11.6
Other net defined benefit liability asset 7.1 11.6
Balance, end of the year 68.6 56.7
Defined benefit obligation | Pension defined benefit plans    
Disclosure of net defined benefit liability (asset) [Line Items]    
Balance, beginning of the year (402.6) (382.5)
Administrative and marketing expenses    
Interest (expense) income (18.4) (17.8)
Administrative expenses paid by the Plans 0.0 0.0
Net defined benefit liability asset included in profit or loss (18.4) (17.8)
Other comprehensive income (loss)    
Adjustments on the plan assets, excluding interest income 0.0 0.0
Actuarial gains (losses) arising from:    
Changes in demographic assumptions 3.0 5.8
Changes in financial assumptions 47.7 (9.6)
Experience adjustments 6.3 (3.4)
Remeasurement (loss) gain, before tax 57.0 (7.2)
Effect of movement in exchange rates (27.0) (11.1)
Net defined benefit liability asset included in other comprehensive income 30.0 (18.3)
Other    
Benefits paid 17.6 16.0
Contributions by employer 0.0 0.0
Other net defined benefit liability asset 17.6 16.0
Balance, end of the year (373.4) (402.6)
Fair value of plan assets | Pension defined benefit plans    
Disclosure of net defined benefit liability (asset) [Line Items]    
Balance, beginning of the year 459.3 422.9
Administrative and marketing expenses    
Interest (expense) income 21.1 20.2
Administrative expenses paid by the Plans (1.9) (2.1)
Net defined benefit liability asset included in profit or loss 19.2 18.1
Other comprehensive income (loss)    
Adjustments on the plan assets, excluding interest income (57.1) 10.3
Actuarial gains (losses) arising from:    
Changes in demographic assumptions 0.0 0.0
Changes in financial assumptions 0.0 0.0
Experience adjustments 0.0 0.0
Remeasurement (loss) gain, before tax (57.1) 10.3
Effect of movement in exchange rates 31.1 12.4
Net defined benefit liability asset included in other comprehensive income (26.0) 22.7
Other    
Benefits paid (17.6) (16.0)
Contributions by employer 7.1 11.6
Other net defined benefit liability asset (10.5) (4.4)
Balance, end of the year $ 442.0 $ 459.3