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Other Liabilities - Summary of Other Liabilities (Detail) - CAD CAD in Millions | Dec. 31, 2017 | Dec. 31, 2016
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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

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