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Recent Accounting Pronouncements and Changes To Accounting Policies - Additional Information (Detail) - CAD ($)
$ in Millions
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Disclosure of expected impact of initial application of new standards or interpretations [line items]      
Weighted average lessee's incremental borrowing rate applied to lease liabilities recognised at date of initial application of IFRS 16 4.43% 4.60%  
Lease incentives and deferred balances   $ 112.7  
Liability for uncertain tax positions $ 25.9   $ 35.0
IFRIC 23 [Member]      
Disclosure of expected impact of initial application of new standards or interpretations [line items]      
Reclassification of uncertain tax liabilities   $ 7.3