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Financial instruments (Measurement of fair values) (Details) - CAD ($) | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Financial assets [Abstract] |  |  |
Cash and cash equivalents | $ 1,143,674,000 | $ 1,247,447,000 | $ 918,382,000
Short-term investments | 1,138,174,000 | 84,906,000 |
Derivative assets | 2,807,000 | 32,098,000 |
Accounts receivable | 183,944,000 | 276,139,000 |
Investments in equity securities | 29,585,000 | 0 |
Financial assets | 2,468,599,000 | 1,640,590,000 |
Financial liabilities [Abstract] |  |  |
Accounts payable and accrued liabilities | 374,714,000 | 340,458,000 |
Lease obligation | 9,287,000 | 4,872,000 |
Derivative liabilities | 58,342,000 | 4,997,000 |
Long-term debt | 997,000,000 | 996,250,000 |
Financial liabilities | 1,439,343,000 | 1,346,577,000 |
Net | 1,029,256,000 | 294,013,000 |
Foreign currency contracts [Member] |  |  |
Financial assets [Abstract] |  |  |
Derivative assets | 2,807,000 | 31,534,000 |
Financial liabilities [Abstract] |  |  |
Derivative liabilities | 51,058,000 | 3,760,000 |
Interest rate contracts [Member] |  |  |
Financial assets [Abstract] |  |  |
Derivative assets |  | 564,000 |
Financial liabilities [Abstract] |  |  |
Derivative liabilities | 7,284,000 | 1,237,000 |
Fair value through profit or loss [member] |  |  |
Financial liabilities [Abstract] |  |  |
Accounts payable and accrued liabilities | 0 | 0 |
Lease obligation | 0 | 0 |
Long-term debt | 0 | 0 |
Financial liabilities | 58,342,000 | 4,997,000 |
Net | (55,535,000) | 27,101,000 |
Fair value through profit or loss [member] | Foreign currency contracts [Member] |  |  |
Financial liabilities [Abstract] |  |  |
Derivative liabilities | 51,058,000 | 3,760,000 |
Fair value through profit or loss [member] | Interest rate contracts [Member] |  |  |
Financial liabilities [Abstract] |  |  |
Derivative liabilities | 7,284,000 | 1,237,000 |
Financial liabilities at amortised cost category [Member] |  |  |
Financial liabilities [Abstract] |  |  |
Accounts payable and accrued liabilities | 374,714,000 | 340,458,000 |
Lease obligation | 9,287,000 | 4,872,000 |
Long-term debt | 997,000,000 | 996,250,000 |
Financial liabilities | 1,381,001,000 | 1,341,580,000 |
Net | 1,084,791,000 | 266,912,000 |
Financial liabilities at amortised cost category [Member] | Foreign currency contracts [Member] |  |  |
Financial liabilities [Abstract] |  |  |
Derivative liabilities | 0 | 0 |
Financial liabilities at amortised cost category [Member] | Interest rate contracts [Member] |  |  |
Financial liabilities [Abstract] |  |  |
Derivative liabilities | 0 | 0 |
Fair value through profit or loss [member] |  |  |
Financial assets [Abstract] |  |  |
Cash and cash equivalents | 0 | 0 |
Short-term investments | 0 | 0 |
Accounts receivable | 0 | 0 |
Financial assets | 2,807,000 | 32,098,000 |
Fair value through profit or loss [member] | Foreign currency contracts [Member] |  |  |
Financial assets [Abstract] |  |  |
Derivative assets | 2,807,000 | 31,534,000 |
Fair value through profit or loss [member] | Interest rate contracts [Member] |  |  |
Financial assets [Abstract] |  |  |
Derivative assets |  | 564,000 |
Financial assets at amortised cost category [Member] |  |  |
Financial assets [Abstract] |  |  |
Cash and cash equivalents | 1,143,674,000 | 1,247,447,000 |
Short-term investments | 1,138,174,000 | 84,906,000 |
Accounts receivable | 183,944,000 | 276,139,000 |
Financial assets | 2,465,792,000 | 1,608,492,000 |
Financial liabilities [Abstract] |  |  |
Net | 1,084,791,000 | 266,912,000 |
Financial assets at amortised cost category [Member] | Foreign currency contracts [Member] |  |  |
Financial assets [Abstract] |  |  |
Derivative assets | $ 0 | 0 |
Financial assets at amortised cost category [Member] | Interest rate contracts [Member] |  |  |
Financial assets [Abstract] |  |  |
Derivative assets |  | $ 0 |

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- Definition The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2021-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_45&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2021-01-01 -Paragraph B13 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2021-en-r&anchor=para_B13_a&doctype=Appendix&subtype=B -URIDate 2021-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 54 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_54_i&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_55&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of investments in equity instruments that the entity has designated at fair value through other comprehensive income. [Refer: At fair value [member]; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 11A -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_11A_c&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 8 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_8_h&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) 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 receive 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 the entity’s own equity instruments do not include puttable financial instruments 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. [Refer: Financial instruments, class [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_25&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35H&doctype=Standard -URIDate 2021-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 35I -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35I&doctype=Standard -URIDate 2021-03-24 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 35M -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35M&doctype=Standard -URIDate 2021-03-24 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 35N -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35N&doctype=Standard -URIDate 2021-03-24 + Details
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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 2021-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_25&doctype=Standard -URIDate 2021-03-24 + Details
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