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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%

X

- Definition

The applicable income tax rate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2018-01-01
-Paragraph 81
-Subparagraph c
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_c_ii&doctype=Standard
-URIDate 2018-03-16

+ Details

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X

- Definition

Deferred tax expense income relating to transition tax related to tax reform.

+ References

No definition available.

+ Details

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X

- Definition

Disclosure of income tax [Line items]

+ References

No definition available.

+ Details

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- Definition

Tax expense relating to transition tax related to tax reform.

+ References

No definition available.

+ Details

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