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Related-Party Disclosures - Schedule of Transactions With Related Parties (Detail) - CAD CAD in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Joint Ventures Where Entity is Venturer [member]
Disclosure of transactions between related parties [Line Items]
Sales to Related Parties	CAD 40.6	CAD 41.5
Distributions Paid	1.3	0.3
Amounts Owed by Related Parties	11.1	28.1
Associates [member]
Disclosure of transactions between related parties [Line Items]
Sales to Related Parties	10.2	11.9
Distributions Paid	0.7	0.5
Amounts Owed by Related Parties	CAD 0.8	CAD 2.4

X

- Definition

The amounts receivable resulting from related party transactions. [Refer: Related parties [member]]

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The amount of revenue arising from the rendering of services in related party transactions. [Refer: Revenue; Related parties [member]]

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- Definition

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