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Financial instruments - Liquidity Risk Tables (Details) - CAD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of maturity analysis for financial liabilities [abstract] |  |
Carrying amount | $ 1,781,812 | $ 1,815,869
Contractual cash flows | 1,786,141 |
Total interest payments on long-term debt | 336,210 |
Due in less than one year [Member] |  |
Disclosure of maturity analysis for financial liabilities [abstract] |  |
Contractual cash flows | 760,288 |
Total interest payments on long-term debt | 69,390 |
Due in one to three years [Member] |  |
Disclosure of maturity analysis for financial liabilities [abstract] |  |
Contractual cash flows | 25,853 |
Total interest payments on long-term debt | 82,080 |
Due in three to five years [Member] |  |
Disclosure of maturity analysis for financial liabilities [abstract] |  |
Contractual cash flows | 400,000 |
Total interest payments on long-term debt | 67,080 |
Due after five years [member] |  |
Disclosure of maturity analysis for financial liabilities [abstract] |  |
Contractual cash flows | 600,000 |
Total interest payments on long-term debt | 117,660 |
Accounts Payable and Accrued Liabilities [Member] |  |
Disclosure of maturity analysis for financial liabilities [abstract] |  |
Carrying amount | 224,754 |
Contractual cash flows | 224,754 |
Accounts Payable and Accrued Liabilities [Member] | Due in less than one year [Member] |  |
Disclosure of maturity analysis for financial liabilities [abstract] |  |
Contractual cash flows | 224,754 |
Accounts Payable and Accrued Liabilities [Member] | Due in one to three years [Member] |  |
Disclosure of maturity analysis for financial liabilities [abstract] |  |
Contractual cash flows | 0 |
Accounts Payable and Accrued Liabilities [Member] | Due in three to five years [Member] |  |
Disclosure of maturity analysis for financial liabilities [abstract] |  |
Contractual cash flows | 0 |
Accounts Payable and Accrued Liabilities [Member] | Due after five years [member] |  |
Disclosure of maturity analysis for financial liabilities [abstract] |  |
Contractual cash flows | 0 |
Long-Term Debt [Member] |  |
Disclosure of maturity analysis for financial liabilities [abstract] |  |
Carrying amount | 1,495,671 |
Contractual cash flows | 1,500,000 |
Long-Term Debt [Member] | Due in less than one year [Member] |  |
Disclosure of maturity analysis for financial liabilities [abstract] |  |
Contractual cash flows | 500,000 |
Long-Term Debt [Member] | Due in one to three years [Member] |  |
Disclosure of maturity analysis for financial liabilities [abstract] |  |
Contractual cash flows | 0 |
Long-Term Debt [Member] | Due in three to five years [Member] |  |
Disclosure of maturity analysis for financial liabilities [abstract] |  |
Contractual cash flows | 400,000 |
Long-Term Debt [Member] | Due after five years [member] |  |
Disclosure of maturity analysis for financial liabilities [abstract] |  |
Contractual cash flows | 600,000 |
Foreign currency contracts [Member] |  |
Disclosure of maturity analysis for financial liabilities [abstract] |  |
Carrying amount | 54,866 |
Contractual cash flows | 54,866 |
Foreign currency contracts [Member] | Due in less than one year [Member] |  |
Disclosure of maturity analysis for financial liabilities [abstract] |  |
Contractual cash flows | 29,013 |
Foreign currency contracts [Member] | Due in one to three years [Member] |  |
Disclosure of maturity analysis for financial liabilities [abstract] |  |
Contractual cash flows | 25,853 |
Foreign currency contracts [Member] | Due in three to five years [Member] |  |
Disclosure of maturity analysis for financial liabilities [abstract] |  |
Contractual cash flows | 0 |
Foreign currency contracts [Member] | Due after five years [member] |  |
Disclosure of maturity analysis for financial liabilities [abstract] |  |
Contractual cash flows | 0 |
Other Derivative Liabilities [Member] |  |
Disclosure of maturity analysis for financial liabilities [abstract] |  |
Carrying amount | 6,521 |
Contractual cash flows | 6,521 |
Other Derivative Liabilities [Member] | Due in less than one year [Member] |  |
Disclosure of maturity analysis for financial liabilities [abstract] |  |
Contractual cash flows | 6,521 |
Other Derivative Liabilities [Member] | Due in one to three years [Member] |  |
Disclosure of maturity analysis for financial liabilities [abstract] |  |
Contractual cash flows | 0 |
Other Derivative Liabilities [Member] | Due in three to five years [Member] |  |
Disclosure of maturity analysis for financial liabilities [abstract] |  |
Contractual cash flows | 0 |
Other Derivative Liabilities [Member] | Due after five years [member] |  |
Disclosure of maturity analysis for financial liabilities [abstract] |  |
Contractual cash flows | 0 |
Unsecured revolving credit facility [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Maximum borrowing capacity | 1,250,000 |
Committed and outstanding | 0 |
Available borrowing facility | 1,250,000 |
Letter of credit facilities [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Maximum borrowing capacity | 1,716,473 |
Committed and outstanding | 1,572,984 |
Available borrowing facility | $ 143,489 |

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- Definition The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_25&doctype=Standard -URIDate 2018-03-16 + Details
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