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Recent Accounting Pronouncements and Changes to Accounting Policies - Summary of Impacts of Adopting IFRS 9 on Equity (After-tax) (Detail) - Increase (decrease) due to application of IFRS 9 [member]
$ in Millions
Jan. 01, 2018
CAD ($)
Disclosure of expected impact of initial application of new standards or interpretations [line items]  
Reclassify equity securities from available-for-sale (AFS) to FVPL $ 0.9
Retained earnings [member]  
Disclosure of expected impact of initial application of new standards or interpretations [line items]  
Reclassify equity securities from available-for-sale (AFS) to FVPL 0.9
Other (0.8)
Total impact of changes in accounting policy, January 1, 2018 0.1
Accumulated other comprehensive income (loss) [member]  
Disclosure of expected impact of initial application of new standards or interpretations [line items]  
Reclassify equity securities from available-for-sale (AFS) to FVPL (0.9)
Total impact of changes in accounting policy, January 1, 2018 $ (0.9)