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Long-Term Debt - Summary of Long Term Debt (Detail) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about borrowings [line items]    
Borrowings $ 933.7 $ 739.6
Less current portion 48.5 198.2
Long-term portion 885.2 541.4
Notes payable [member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings 76.8 60.8
Revolving credit facilities [member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings 528.6 209.9
Term loan [member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings 308.8 458.5
Finance lease obligations [member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings $ 19.5 $ 10.4