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Other Assets - Schedule of Other Assets (Detail) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of other assets [line items]    
Other financial assets $ 144.2 $ 147.1
Other Assets 198.7 209.5
Less current portion - financial 18.1 14.0
Less current portion - non-financial 5.1  
Long-term portion 175.5 195.5
Other assets [member] | Investment tax credits [member]    
Disclosure of other assets [line items]    
Other non-financial assets 6.1 9.2
Other assets [member] | Transaction costs on long term debt [member]    
Disclosure of other assets [line items]    
Other non-financial assets 3.6 4.9
Other assets [member] | Deferred contract costs [member]    
Disclosure of other assets [line items]    
Other non-financial assets 8.8  
Other assets [member] | Investments held for self-insured liabilities [member]    
Disclosure of other assets [line items]    
Other financial assets 144.2 147.1
Other assets [member] | Holdbacks on long-term contracts [member]    
Disclosure of other assets [line items]    
Other financial assets 28.7 39.6
Other assets [member] | Indemnifications [member]    
Disclosure of other assets [line items]    
Other financial assets 0.8 2.4
Other assets [member] | Other [member]    
Disclosure of other assets [line items]    
Other financial assets $ 6.5 $ 6.3