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Pension and other post-retirement benefits - Fair Value of Investments by Asset Category (Details) CAD in Thousands	Dec. 31, 2017 CAD
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Allocation percentage	72.00%
Equity securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	CAD 505,219
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Allocation percentage	27.00%
Debt securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	CAD 164,281
Other
Defined Benefit Plan Disclosure [Line Items]
Allocation percentage	0.00%
Other | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	CAD 945

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+ References

No definition available.

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- Definition

Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2446-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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