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Employee Defined Benefit Obligations - Summary of Employee Defined Benefit Obligations (Detail) - CAD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of defined benefit plans [line items]    
Net defined benefit pension asset $ (26.0) $ (10.0)
Net defined benefit pension liability/ End of employment benefit plans 85.2 68.6
Pension defined benefit plans [member]    
Disclosure of defined benefit plans [line items]    
Net defined benefit pension asset (26.0) (10.0)
Net defined benefit pension liability/ End of employment benefit plans 69.8 55.5
Post employment benefit plans [member]    
Disclosure of defined benefit plans [line items]    
Net defined benefit pension liability/ End of employment benefit plans $ 15.4 $ 13.1