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Income Taxes - Schedule of Significant Components of the Company's Net Deferred Income Tax Assets (Liabilities) (Detail) - CAD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Deferred income tax assets (liabilities) |  |  |
Deferred income tax assets (liabilities) | $ (33.1) | $ (31.4) | $ (53.4)
Intangible asset [member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Deferred tax liabilities | (86.1) | (78.8) |
Property, plant and equipment [member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Deferred tax liabilities | (7.3) | (3.6) |
Deferred tax arising in business acquisition [member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Deferred tax liabilities | (1.2) | (2.5) |
Non-capital and capital tax losses [member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Deferred income tax assets | 33.4 | 36.1 |
Loss and tax credit carryforwards [member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Deferred income tax assets | 16.7 | 9.6 |
Deferred tax defined benefit obligation [member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Deferred income tax assets | 7.7 | 3.3 |
Other temporary differences [member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Deferred income tax assets | $ 3.7 | $ 4.5 |

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