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Provisions (Details) - CAD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023
Provisions [Line Items] |  |
Beginning of year | $ 1,061,984,000 |
Changes in estimates and discount rates [Abstract] |  |
Capitalized in property, plant and equipment | (17,308,000) |
Recognized in earnings | (37,352,000) |
Provisions used during the period | (34,746,000) |
Unwinding of discount | 36,243,000 |
Effect of movements in exchange rates | 26,986,000 |
End of period | 1,035,807,000 |
Current | 37,974,000 | $ 39,113,000
Non-current | 997,833,000 | 1,022,871,000
Outstanding letters of credit facility | 1,527,815,000 | 1,383,689,000
Reclamation [Member] |  |
Provisions [Line Items] |  |
Beginning of year | 1,051,167,000 |
Changes in estimates and discount rates [Abstract] |  |
Capitalized in property, plant and equipment | (17,308,000) |
Recognized in earnings | (37,683,000) |
Provisions used during the period | (34,064,000) |
Unwinding of discount | 35,941,000 |
Effect of movements in exchange rates | 26,986,000 |
End of period | 1,025,039,000 |
Current | 34,063,000 |
Non-current | 990,976,000 |
Estimated total future decommissioning and reclamation costs | $ 1,382,661,000 | 1,356,018,000
Description of period, majority of expenditures will occur after | 2029 |
Outstanding letters of credit facility | $ 1,125,194,000 | 1,060,769,000
Reclamation [Member] | Uranium [Member] |  |
Provisions [Line Items] |  |
Beginning of year | 874,773,000 |
Changes in estimates and discount rates [Abstract] |  |
End of period | 865,574,000 |
Reclamation [Member] | Fuel Services [Member] |  |
Provisions [Line Items] |  |
Beginning of year | 176,394,000 |
Changes in estimates and discount rates [Abstract] |  |
End of period | 159,465,000 |
Waste Disposal [Member] |  |
Provisions [Line Items] |  |
Beginning of year | 10,817,000 |
Changes in estimates and discount rates [Abstract] |  |
Capitalized in property, plant and equipment | 0 |
Recognized in earnings | 331,000 |
Provisions used during the period | (682,000) |
Unwinding of discount | 302,000 |
Effect of movements in exchange rates | 0 |
End of period | 10,768,000 |
Current | 3,911,000 |
Non-current | $ 6,857,000 |
Period in which majority of expenditures are expected to occur | 3 years |
Waste Disposal [Member] | Fuel Services [Member] |  |
Changes in estimates and discount rates [Abstract] |  |
Estimated total future decommissioning and reclamation costs | $ 9,663,000 | $ 9,681,000

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