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Other Liabilities - Summary of Other Liabilities (Detail) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Liabilities [abstract]    
Lease inducement benefits $ 111.2 $ 57.2
Deferred share units payable 9.0 15.5
Other cash-settled share-based compensation 3.8 7.0
Liability for uncertain tax positions 35.0 31.3
Other 4.6 16.3
Other liabilities 163.6 127.3
Other liabilities 163.6 127.3
Less current portion 23.2 26.2
Long-term portion $ 140.4 $ 101.1