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Net Employee Defined Benefit Liability - Summary of Reconciliation for Net Defined Benefit Liability (Detail) - CAD
CAD in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of net defined benefit liability (asset) [Line Items]    
Balance, beginning of the year CAD 50.5 CAD 43.8
Included in profit or loss    
Interest expense (income) 1.5 0.8
Administrative expenses paid by the Plans 1.0 0.9
Net defined benefit liability asset included in profit or loss 2.5 1.7
Included in other comprehensive income    
Return on the plan assets (excluding interest income) (30.1) (19.5)
Actuarial (gains) losses arising from:    
Changes in demographic assumptions (8.1) (1.3)
Changes in financial assumptions 29.5 35.0
Experience adjustments (5.3) 3.2
Effect of movement in exchange rates 0.8 (4.9)
Net defined benefit liability asset included in other comprehensive income (13.2) 12.5
Other    
Contributions by employer (21.3) (7.5)
Other net defined benefit liability asset (21.3) (7.5)
Balance, end of the year 18.5 50.5
Net defined benefit asset (12.7)  
Net defined benefit liability 31.2 50.5
Defined benefit obligation [member]    
Disclosure of net defined benefit liability (asset) [Line Items]    
Balance, beginning of the year 374.6 383.6
Included in profit or loss    
Interest expense (income) 10.4 7.5
Net defined benefit liability asset included in profit or loss 10.4 7.5
Actuarial (gains) losses arising from:    
Changes in demographic assumptions (8.1) (1.3)
Changes in financial assumptions 29.5 35.0
Experience adjustments (5.3) 3.2
Effect of movement in exchange rates 10.2 (45.0)
Net defined benefit liability asset included in other comprehensive income 26.3 (8.1)
Other    
Benefits paid (13.6) (8.4)
Other net defined benefit liability asset (13.6) (8.4)
Balance, end of the year 397.7 374.6
Fair value of plan assets [member]    
Disclosure of net defined benefit liability (asset) [Line Items]    
Balance, beginning of the year (324.1) (339.8)
Included in profit or loss    
Interest expense (income) (8.9) (6.7)
Administrative expenses paid by the Plans 1.0 0.9
Net defined benefit liability asset included in profit or loss (7.9) (5.8)
Included in other comprehensive income    
Return on the plan assets (excluding interest income) (30.1) (19.5)
Actuarial (gains) losses arising from:    
Effect of movement in exchange rates (9.4) 40.1
Net defined benefit liability asset included in other comprehensive income (39.5) 20.6
Other    
Benefits paid 13.6 8.4
Contributions by employer (21.3) (7.5)
Other net defined benefit liability asset (7.7) 0.9
Balance, end of the year CAD (379.2) CAD (324.1)