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Significant accounting policies - Commonly Owned Operating Facilities (Details)	12 Months Ended
	Dec. 31, 2017 CAD
Accounting Policies [Abstract]
Cost of ownership in plant in service	CAD 833,578
Accumulated Depreciation	225,156
Expenditures	CAD 99,930

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- Definition

Cost of Ownership, Plant In Service

+ References

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- Definition

Expenditures, Commonly Owned Facilities

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- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.14)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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