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Other Liabilities - Summary of Other Liabilities (Detail) - CAD
CAD in Millions
Dec. 31, 2017
Dec. 31, 2016
Liabilities [abstract]    
Deferred gain on sale leaseback CAD 0.5 CAD 1.1
Lease inducement benefits 57.2 50.3
Lease disadvantages 2.7 4.8
Deferred share units payable 15.5 16.2
Other cash-settled share-based compensation 7.0 8.0
Liability for uncertain tax positions 31.3 28.8
Other liabilities 114.2 109.2
Other liabilities 114.2 109.2
Less current portion 22.2 20.8
Long-term portion CAD 92.0 CAD 88.4