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Employee Defined Benefit Obligations - Summary of Reconciliation for Net Defined Benefit (Asset) Liability (Details) - Pension defined benefit plans - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of net defined benefit liability (asset) [Line Items]    
Balance, beginning of the year $ 25.8 $ 26.4
Administrative and marketing expenses    
Interest expense (income) 0.3 0.1
Administrative expenses paid by the Plans 1.6 1.0
Net defined benefit liability asset included in profit or loss 1.9 1.1
Other comprehensive loss (income)    
Adjustments on the plan assets, excluding interest income 127.0 11.1
Actuarial (gains) losses arising from:    
Changes in demographic assumptions (0.3) 5.0
Changes in financial assumptions (192.7) 0.5
Experience adjustments 16.3 (1.8)
Remeasurement (gain) loss, before tax (49.7) 14.8
Effect of movement in exchange rates (0.8) (0.3)
Net defined benefit liability asset included in other comprehensive income (50.5) 14.5
Other    
Benefits paid 0.0 0.0
Contributions by employer (17.6) (16.2)
Other net defined benefit liability asset (17.6) (16.2)
Balance, end of the year (40.4) 25.8
Defined benefit obligation    
Disclosure of net defined benefit liability (asset) [Line Items]    
Balance, beginning of the year 586.1 601.6
Administrative and marketing expenses    
Interest expense (income) 9.8 6.8
Administrative expenses paid by the Plans 0.0 0.0
Net defined benefit liability asset included in profit or loss 9.8 6.8
Other comprehensive loss (income)    
Adjustments on the plan assets, excluding interest income 0.0 0.0
Actuarial (gains) losses arising from:    
Changes in demographic assumptions (0.3) 5.0
Changes in financial assumptions (192.7) 0.5
Experience adjustments 16.3 (1.8)
Remeasurement (gain) loss, before tax (176.7) 3.7
Effect of movement in exchange rates (22.7) (10.4)
Net defined benefit liability asset included in other comprehensive income (199.4) (6.7)
Other    
Benefits paid (14.0) (15.6)
Contributions by employer 0.0 0.0
Other net defined benefit liability asset (14.0) (15.6)
Balance, end of the year 382.5 586.1
Fair value of plan assets    
Disclosure of net defined benefit liability (asset) [Line Items]    
Balance, beginning of the year 560.3 575.2
Administrative and marketing expenses    
Interest expense (income) 9.5 6.7
Administrative expenses paid by the Plans (1.6) (1.0)
Net defined benefit liability asset included in profit or loss 7.9 5.7
Other comprehensive loss (income)    
Adjustments on the plan assets, excluding interest income (127.0) (11.1)
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 (127.0) (11.1)
Effect of movement in exchange rates (21.9) (10.1)
Net defined benefit liability asset included in other comprehensive income (148.9) (21.2)
Other    
Benefits paid (14.0) (15.6)
Contributions by employer 17.6 16.2
Other net defined benefit liability asset 3.6 0.6
Balance, end of the year $ 422.9 $ 560.3