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Other Financial Assets - Disclosure of Other Financial Assets (Detail) - CAD
CAD in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of other financial assets [line items]    
Other financial assets CAD 195.4 CAD 181.0
Less current portion 9.3 20.9
Long-term portion 186.1 160.1
Investments held for self-insured liabilities [member]    
Disclosure of other financial assets [line items]    
Other financial assets 147.1 141.1
Holdbacks on long-term contracts [member]    
Disclosure of other financial assets [line items]    
Other financial assets 39.6 33.9
Indemnifications [member]    
Disclosure of other financial assets [line items]    
Other financial assets 2.4 2.4
Other assets [member]    
Disclosure of other financial assets [line items]    
Other financial assets CAD 6.3 CAD 3.6