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Equity-accounted investees (Associate financial position) (Details) - CAD ($)
 12 Months Ended
Nov. 07, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of significant investments in associates [Line Items]        
Cash and cash equivalents   $ 600,462,000 $ 566,809,000 $ 1,143,674,000
Non-current assets   7,983,820,000 8,092,167,000  
Current liabilities   (1,185,761,000) (1,189,104,000)  
Current portion of long-term debt   (285,707,000) (499,821,000)  
Other current liabilities   (221,820,000) (48,544,000)  
Non-current liabilities   (2,356,913,000) (2,650,644,000)  
Long-term debt   (995,583,000) (1,284,353,000)  
Investment in equity-accounted investee   3,218,456,000 3,173,185,000  
Joint Venture Inkai LLP [Member]        
Disclosure of significant investments in associates [Line Items]        
Cash and cash equivalents   47,282,000 24,074,000  
Other current assets   694,041,000 551,917,000  
Non-current assets   307,801,000 332,655,000  
Current liabilities   (42,368,000) (40,985,000)  
Non-current liabilities   (27,802,000) (30,211,000)  
Net assets   978,954,000 837,450,000  
Cameco's share of net assets   391,582,000 334,980,000  
Consolidating adjustments   (93,365,000) (74,223,000)  
Fair value increment   77,992,000 81,090,000  
Dividends declared but not received   9,760,000 5,952,000  
Dividends in excess of ownership percentage   (107,179,000) (74,843,000)  
Impact of foreign exchange on acquisition costs   7,920,000 850,000  
Investment in equity-accounted investee   $ 286,710,000 $ 273,806,000  
Ownership interest in associates   40.00% 40.00%  
Westinghouse Electric Company [Member]        
Disclosure of significant investments in associates [Line Items]        
Cash and cash equivalents   $ 255,589,000 $ 265,146,000  
Other current assets   2,737,164,000 2,364,602,000  
Intangible assets   7,821,802,000 7,655,386,000  
Goodwill   1,698,174,000 1,534,947,000  
Non-current assets   3,113,031,000 3,102,566,000  
Current portion of long-term debt   (44,576,000) (208,959,000)  
Other current liabilities   (2,751,396,000) (2,255,099,000)  
Long-term debt   (4,924,398,000) (4,554,227,000)  
Other non-current liabilities   (2,078,688,000) (2,130,446,000)  
Net assets   5,826,702,000 5,773,916,000  
Cameco's share of net assets   2,842,772,000 2,817,441,000  
Acquisition costs   83,896,000 83,916,000  
Impact of foreign exchange on acquisition costs   5,078,000 (1,978,000)  
Investment in equity-accounted investee   $ 2,931,746,000 $ 2,899,379,000  
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   $ 25,127,000 $ 24,036,000  
Westinghouse Electric Company [Member] | Attributable to Shareholders [Member]        
Disclosure of significant investments in associates [Line Items]        
Investment in equity-accounted investee   $ 5,801,575,000 $ 5,749,880,000