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Other Liabilities - Summary of Other Liabilities (Detail) - CAD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Liabilities [Abstract]    
Lease inducement benefits and lease disadvantages   $ 112.7
Cash-settled share-based compensation $ 23.0 12.8
Other 5.1 3.1
Other liabilities 28.1 128.6
Less current portion 12.1 23.2
Long-term portion $ 16.0 $ 105.4