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Disposition of a Subsidiary - Additional Information (Detail) CAD in Millions, $ in Millions			3 Months Ended	12 Months Ended
	May 05, 2017 CAD	May 05, 2017 USD ($)	Jun. 30, 2017 CAD	Dec. 31, 2017 CAD	Dec. 31, 2016 CAD
Disclosure of disposal of subsidiaries [line items]
Current tax expense				CAD 192.9	CAD 37.7
Deferred taxes				(26.4)	CAD 12.6
Disposal of major subsidiary [member]
Disclosure of disposal of subsidiaries [line items]
Name of subsidiary	Innovyze	Innovyze
Gross proceeds from sale of subsidiaries	CAD 369.1	$ 270.0		369.1
Cash proceeds from sale of subsidiaries	CAD 336.9			336.9
Repayment of long term debt				CAD 221.3
Current tax expense			CAD 124.1
Deferred taxes			CAD 29.6

X

- Definition

The amount of income taxes payable (recoverable) in respect of the taxable profit (tax loss) for a period.

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The amount of tax expense (income) relating to changes in deferred tax liabilities and deferred tax assets. [Refer: Deferred tax assets; Deferred tax liabilities]

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The name of a subsidiary. [Refer: Subsidiaries [member]]

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Disclosure of disposal of subsidiaries.

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Gross proceeds from disposal of subsidiaries.

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