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Income Taxes - Additional Informations (Detail) - CAD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Aug. 01, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of income tax [line items] |  |  |
Transition tax related to US tax reform |  | $ (10.0) | $ 31.2
Revaluation due to US tax reform | $ 10.0 |  | $ (12.6)
Federal tax rate |  | 27.10% | 27.00%
United States [member] |  |  |
Disclosure of income tax [line items] |  |  |
Federal tax rate |  | 21.00% | 21.00%

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