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Employee Defined Benefit Plans - Schedule of Reconciliation for Net Defined Benefit (Asset) Liability (Details) - Pension defined benefit plans - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of net defined benefit liability (asset) [Line Items]    
Balance, beginning of the year $ (40.4) $ 25.8
Administrative and marketing expenses    
Interest income (expense) 2.4 (0.3)
Administrative expenses paid by the Plans (2.1) (1.6)
Net defined benefit liability asset included in profit or loss 0.3 (1.9)
Other comprehensive income (loss)    
Adjustments on the plan assets, excluding interest income 10.3 (127.0)
Actuarial gains (losses) arising from:    
Changes in demographic assumptions 5.8 0.3
Changes in financial assumptions (9.6) 192.7
Experience adjustments (3.4) (16.3)
Remeasurement gain (loss), before tax 3.1 49.7
Effect of movement in exchange rates 1.3 0.8
Net defined benefit liability asset included in other comprehensive income 4.4 50.5
Other    
Benefits paid 0.0 0.0
Contributions by employer 11.6 17.6
Other net defined benefit liability asset 11.6 17.6
Balance, end of the year (56.7) (40.4)
Defined benefit obligation    
Disclosure of net defined benefit liability (asset) [Line Items]    
Balance, beginning of the year 382.5 586.1
Administrative and marketing expenses    
Interest income (expense) (17.8) (9.8)
Administrative expenses paid by the Plans 0.0 0.0
Net defined benefit liability asset included in profit or loss (17.8) (9.8)
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 5.8 0.3
Changes in financial assumptions (9.6) 192.7
Experience adjustments (3.4) (16.3)
Remeasurement gain (loss), before tax (7.2) 176.7
Effect of movement in exchange rates (11.1) 22.7
Net defined benefit liability asset included in other comprehensive income (18.3) 199.4
Other    
Benefits paid 16.0 14.0
Contributions by employer 0.0 0.0
Other net defined benefit liability asset 16.0 14.0
Balance, end of the year 402.6 382.5
Fair value of plan assets    
Disclosure of net defined benefit liability (asset) [Line Items]    
Balance, beginning of the year (422.9) (560.3)
Administrative and marketing expenses    
Interest income (expense) 20.2 9.5
Administrative expenses paid by the Plans (2.1) (1.6)
Net defined benefit liability asset included in profit or loss 18.1 7.9
Other comprehensive income (loss)    
Adjustments on the plan assets, excluding interest income 10.3 (127.0)
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 gain (loss), before tax 10.3 (127.0)
Effect of movement in exchange rates 12.4 (21.9)
Net defined benefit liability asset included in other comprehensive income 22.7 (148.9)
Other    
Benefits paid (16.0) (14.0)
Contributions by employer 11.6 17.6
Other net defined benefit liability asset (4.4) 3.6
Balance, end of the year $ (459.3) $ (422.9)