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Employee Defined Benefit Obligations - Summary of Employee Defined Benefit Obligations (Detail) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of defined benefit plans [line items]    
Net defined benefit pension asset $ (10.0) $ (12.7)
Net defined benefit pension liability/ End of employment benefit plans 68.6 44.8
Pension defined benefit plans [member]    
Disclosure of defined benefit plans [line items]    
Net defined benefit pension asset (10.0) (12.7)
Net defined benefit pension liability/ End of employment benefit plans 55.5 31.2
Post employment benefit plans [member]    
Disclosure of defined benefit plans [line items]    
Net defined benefit pension liability/ End of employment benefit plans $ 13.1 $ 13.6