Equity-accounted investees (Summary of Equity-accounted Investees) (Details) - CAD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Disclosure of significant investments in associates [Line Items]
Investment in equity-accounted investees	$ 3,173,185	$ 210,972
Westinghouse Electric Company [Member]
Disclosure of significant investments in associates [Line Items]
Investment in equity-accounted investees	2,899,379	0
JV Inkai Associate [Member]
Disclosure of significant investments in associates [Line Items]
Investment in equity-accounted investees	273,806	210,972
Global Laser Enrichment LLC [Member]
Disclosure of significant investments in associates [Line Items]
Investment in equity-accounted investees	$ 0	$ 0

The amount of investments accounted for using the equity method. The equity method is a method of accounting whereby the investment is initially recognised at cost and adjusted thereafter for the post-acquisition change in the investor's share of net assets of the investee. The investor's profit or loss includes its share of the profit or loss of the investee. The investor's other comprehensive income includes its share of the other comprehensive income of the investee. [Refer: At cost [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 8
-IssueDate 2023-01-01
-Paragraph 24
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2023-en-r&anchor=para_24_a&doctype=Standard
-URIDate 2023-03-23

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2023-01-01
-Paragraph B16
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2023-en-r&anchor=para_B16&doctype=Appendix&subtype=B
-URIDate 2023-03-23

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2023-01-01
-Paragraph 54
-Subparagraph e
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_54_e&doctype=Standard
-URIDate 2023-03-23

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant