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Employee Defined Benefit Obligations - Summary of Reconciliation for Net Defined Benefit Liability (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of net defined benefit liability (asset) [Line Items]    
Net defined benefit asset $ (26.0) $ (10.0)
Net defined benefit liability 85.2 68.6
Included in pre-tax profit or loss    
Net defined benefit liability asset included in profit or loss 2.0 12.8
Pension defined benefit plans [member]    
Disclosure of net defined benefit liability (asset) [Line Items]    
Balance, beginning of the year 45.5 18.5
Net defined benefit asset (26.0) (10.0)
Acquisitions   16.5
Net defined benefit liability 69.8 55.5
Included in pre-tax profit or loss    
Interest expense (income) 0.9 0.6
Past service cost   10.5
Administrative expenses paid by the Plans 1.1 1.7
Net defined benefit liability asset included in profit or loss 2.0 12.8
Included in other comprehensive loss (income)    
Return on the plan assets (excluding interest income) (55.5) 17.4
Actuarial (gains) losses arising from:    
Changes in demographic assumptions (1.9) (0.8)
Changes in financial assumptions 81.9 (9.3)
Experience adjustments (4.4) 5.5
Remeasurement loss on net employee defined benefit liability, before tax 20.1 12.8
Effect of movement in exchange rates (0.8) 1.2
Net defined benefit liability asset included in other comprehensive income 19.3 14.0
Other    
Benefits paid   (0.2)
Contributions by employer (23.0) (16.1)
Other net defined benefit liability asset (23.0) (16.3)
Balance, end of the year 43.8 45.5
Defined benefit obligation [member]    
Included in pre-tax profit or loss    
Past service cost   10.5
Defined benefit obligation [member] | Pension defined benefit plans [member]    
Disclosure of net defined benefit liability (asset) [Line Items]    
Balance, beginning of the year 494.3 397.7
Acquisitions   80.9
Included in pre-tax profit or loss    
Interest expense (income) 13.0 10.8
Past service cost   10.5
Net defined benefit liability asset included in profit or loss 13.0 21.3
Actuarial (gains) losses arising from:    
Changes in demographic assumptions (1.9) (0.8)
Changes in financial assumptions 81.9 (9.3)
Experience adjustments (4.4) 5.5
Remeasurement loss on net employee defined benefit liability, before tax 75.6 (4.6)
Effect of movement in exchange rates (5.0) 11.5
Net defined benefit liability asset included in other comprehensive income 70.6 6.9
Other    
Benefits paid (14.8) (12.5)
Other net defined benefit liability asset (14.8) (12.5)
Balance, end of the year 563.1 494.3
Fair value of plan assets [member] | Pension defined benefit plans [member]    
Disclosure of net defined benefit liability (asset) [Line Items]    
Balance, beginning of the year (448.8) (379.2)
Acquisitions   (64.4)
Included in pre-tax profit or loss    
Interest expense (income) (12.1) (10.2)
Administrative expenses paid by the Plans 1.1 1.7
Net defined benefit liability asset included in profit or loss (11.0) (8.5)
Included in other comprehensive loss (income)    
Return on the plan assets (excluding interest income) (55.5) 17.4
Actuarial (gains) losses arising from:    
Remeasurement loss on net employee defined benefit liability, before tax (55.5) 17.4
Effect of movement in exchange rates 4.2 (10.3)
Net defined benefit liability asset included in other comprehensive income (51.3) 7.1
Other    
Benefits paid 14.8 12.3
Contributions by employer (23.0) (16.1)
Other net defined benefit liability asset (8.2) (3.8)
Balance, end of the year $ (519.3) $ (448.8)