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Fair Value Measurements - Summary of Fair Value Hierarchy for Assets (Detail) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of fair value measurement of assets [line items]    
Other financial assets $ 144.2 $ 147.1
Recurring fair value measurement [member] | Investments held for self-insured liabilities [member]    
Disclosure of fair value measurement of assets [line items]    
Other financial assets 144.2  
Recurring fair value measurement [member] | Significant other observable inputs [member] | Investments held for self-insured liabilities [member]    
Disclosure of fair value measurement of assets [line items]    
Other financial assets $ 144.2