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Employee Defined Benefit Obligations - Summary of Reconciliation for Net Defined Benefit Liability (Details) - Pension defined benefit plans - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of net defined benefit liability (asset) [Line Items]    
Balance, beginning of the year $ 43.8 $ 45.5
Administrative and marketing expenses    
Interest expense (income) 0.6 0.9
Past service cost 0.3 0.0
Administrative expenses paid by the Plans 1.1 1.1
Net defined benefit liability asset included in profit or loss 2.0 2.0
Other comprehensive loss (income)    
Return on the plan assets, excluding interest income (41.1) (55.5)
Actuarial (gains) losses arising from:    
Changes in demographic assumptions 1.0 (1.9)
Changes in financial assumptions 40.0 81.9
Experience adjustments 0.6 (4.4)
Remeasurement loss on net employee defined benefit liability, before tax 0.5 20.1
Effect of movement in exchange rates 0.3 (0.8)
Net defined benefit liability asset included in other comprehensive income 0.8 19.3
Other    
Benefits paid 0.0 0.0
Contributions by employer (20.2) (23.0)
Other net defined benefit liability asset (20.2) (23.0)
Balance, end of the year 26.4 43.8
Defined benefit obligation    
Disclosure of net defined benefit liability (asset) [Line Items]    
Balance, beginning of the year 563.1 494.3
Administrative and marketing expenses    
Interest expense (income) 10.6 13.0
Past service cost 0.3 0.0
Administrative expenses paid by the Plans 0.0 0.0
Net defined benefit liability asset included in profit or loss 10.9 13.0
Other comprehensive loss (income)    
Return on the plan assets, excluding interest income 0.0 0.0
Actuarial (gains) losses arising from:    
Changes in demographic assumptions 1.0 (1.9)
Changes in financial assumptions 40.0 81.9
Experience adjustments 0.6 (4.4)
Remeasurement loss on net employee defined benefit liability, before tax 41.6 75.6
Effect of movement in exchange rates 6.1 (5.0)
Net defined benefit liability asset included in other comprehensive income 47.7 70.6
Other    
Benefits paid (20.1) (14.8)
Contributions by employer 0.0 0.0
Other net defined benefit liability asset (20.1) (14.8)
Balance, end of the year 601.6 563.1
Fair value of plan assets    
Disclosure of net defined benefit liability (asset) [Line Items]    
Balance, beginning of the year (519.3) (448.8)
Administrative and marketing expenses    
Interest expense (income) (10.0) (12.1)
Past service cost 0.0 0.0
Administrative expenses paid by the Plans 1.1 1.1
Net defined benefit liability asset included in profit or loss (8.9) (11.0)
Other comprehensive loss (income)    
Return on the plan assets, excluding interest income (41.1) (55.5)
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 on net employee defined benefit liability, before tax (41.1) (55.5)
Effect of movement in exchange rates (5.8) 4.2
Net defined benefit liability asset included in other comprehensive income (46.9) (51.3)
Other    
Benefits paid 20.1 14.8
Contributions by employer (20.2) (23.0)
Other net defined benefit liability asset (0.1) (8.2)
Balance, end of the year $ (575.2) $ (519.3)