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Other Assets - Schedule of Other Assets (Detail) - CAD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of other assets [line items]    
Other financial assets $ 153.0 $ 144.2
Other Assets 216.4 198.7
Less current portion - financial 11.6 18.1
Less current portion - non-financial 6.5 5.1
Long-term portion 198.3 175.5
Other assets [member]    
Disclosure of other assets [line items]    
Other non-financial assets 16.9 18.5
Other assets [member] | Investments held for self-insured liabilities [member]    
Disclosure of other assets [line items]    
Other financial assets 153.0 144.2
Other assets [member] | Holdbacks on long-term contracts [member]    
Disclosure of other assets [line items]    
Other financial assets 33.9 28.7
Other assets [member] | Other [member]    
Disclosure of other assets [line items]    
Other financial assets $ 12.6 $ 7.3