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Goodwill - Schedule of Reconciliation of Changes in Goodwill (Detail) - CAD
CAD in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill CAD 1,828.1 CAD 966.5
Current year acquisitions 16.3 850.7
Current year disposals (194.4)  
Impact of foreign exchange (93.4) 10.9
Goodwill 1,556.6 1,828.1
Gross carrying amount [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill 2,006.1  
Goodwill 1,734.6 2,006.1
Accumulated impairment [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill (178.0)  
Goodwill CAD (178.0) CAD (178.0)