v3.26.1
Equity-accounted investees (Associate financial position) (Details) - CAD ($)
 12 Months Ended
Nov. 07, 2023
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of significant investments in associates [Line Items]        
Cash and cash equivalents   $ 1,114,860,000 $ 600,462,000 $ 566,809,000
Non-current assets   7,662,067,000 7,983,820,000  
Current liabilities   (1,070,186,000) (1,185,761,000)  
Current portion of long-term debt   0 (285,707,000)  
Other current liabilities   (134,667,000) (221,820,000)  
Non-current liabilities   (2,327,718,000) (2,356,913,000)  
Long-term debt   (996,348,000) (995,583,000)  
Investment in equity-accounted investee   2,987,126,000 3,218,456,000  
Joint Venture Inkai LLP [Member]        
Disclosure of significant investments in associates [Line Items]        
Cash and cash equivalents   46,266,000 47,282,000  
Other current assets   847,942,000 694,041,000  
Non-current assets   325,363,000 307,801,000  
Current liabilities   (52,410,000) (42,368,000)  
Non-current liabilities   (23,463,000) (27,802,000)  
Net assets   1,143,698,000 978,954,000  
Cameco's share of net assets   457,479,000 391,582,000  
Consolidating adjustments   (116,494,000) (93,365,000)  
Fair value increment   74,643,000 77,992,000  
Dividends declared but not received   7,209,000 9,760,000  
Dividends in excess of ownership percentage   (109,064,000) (107,179,000)  
Impact of foreign exchange on acquisition costs   1,507,000 7,920,000  
Investment in equity-accounted investee   $ 315,280,000 $ 286,710,000  
Ownership interest in associates   40.00% 40.00%  
Westinghouse Electric Company [Member]        
Disclosure of significant investments in associates [Line Items]        
Cash and cash equivalents   $ 268,310,000 $ 255,589,000  
Other current assets   2,665,145,000 2,737,164,000  
Intangible assets   7,186,939,000 7,821,802,000  
Goodwill   1,667,293,000 1,698,174,000  
Non-current assets   3,126,447,000 3,113,031,000  
Current portion of long-term debt   (48,695,000) (44,576,000)  
Other current liabilities   (2,827,358,000) (2,751,396,000)  
Long-term debt   (4,682,928,000) (4,924,398,000)  
Other non-current liabilities   (2,049,246,000) (2,078,688,000)  
Net assets   5,305,907,000 5,826,702,000  
Cameco's share of net assets   2,586,955,000 2,842,772,000  
Acquisition costs   83,896,000 83,896,000  
Impact of foreign exchange on acquisition costs   995,000 5,078,000  
Investment in equity-accounted investee   $ 2,671,846,000 $ 2,931,746,000  
Ownership stake 49.00% 49.00% 49.00%  
Westinghouse Electric Company [Member] | Non-Controlling Interest [Member]        
Disclosure of significant investments in associates [Line Items]        
Investment in equity-accounted investee   $ 26,408,000 $ 25,127,000  
Westinghouse Electric Company [Member] | Attributable to Shareholders [Member]        
Disclosure of significant investments in associates [Line Items]        
Investment in equity-accounted investee   $ 5,279,499,000 $ 5,801,575,000