Share capital (Details) |
12 Months Ended | |
|---|---|---|
|
Dec. 31, 2025
shares
$ / shares
|
Dec. 31, 2024
shares
$ / shares
|
|
| Number of issued shares [Line Items] | ||
| Common shares par value | no | |
| Beginning of year | 435,312,083 | 434,175,752 |
| Stock option plan | 145,895 | 1,136,331 |
| End of year | 435,457,978 | 435,312,083 |
| Dividends Paid Ordinary Shares Per Share | $ / shares | $ 0.24 | $ 0.16 |
| Common shares [Member] | ||
| Number of issued shares [Line Items] | ||
| Class B share preferences | no shareholder, resident in Canada, is allowed to own more than 25% of the Company’s outstanding common shares, either individually or together with associates. A non-resident of Canada is not allowed to own more than 15%. In addition, no more than 25% of total shareholder votes cast may be cast by non-resident shareholders. | |
| Common shares [Member] | Share Holder Resident [Member] | Maximum [Member] | ||
| Number of issued shares [Line Items] | ||
| Ownership in Cameco | 25.00% | 25.00% |
| Common shares [Member] | Share Holder Non-Resident [Member] | Maximum [Member] | ||
| Number of issued shares [Line Items] | ||
| Ownership in Cameco | 15.00% | 15.00% |
| Percentage Votes Of Ordinary Shares Of Company | 25.00% | 25.00% |
| Class B Shares [Member] | ||
| Number of issued shares [Line Items] | ||
| Class B share par value | $ / shares | $ 1 | |
| Class B share preferences | entitles the shareholder to vote separately as a class in respect of any proposal to locate the head office of Cameco to a place not in the province of Saskatchewan | |