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Provisions (Details) - CAD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022
Provisions [Line Items] |  |
Beginning of year | $ 1,071,030,000 |
Changes in estimates and discount rates [Abstract] |  |
Capitalized in property, plant and equipment | 2,166,000 |
Recognized in earnings | (5,361,000) |
Provisions used during the period | (38,982,000) |
Unwinding of discount | 39,619,000 |
Effect of movements in exchange rates | (6,488,000) |
End of period | 1,061,984,000 |
Current | 39,113,000 | $ 48,305,000
Non-current | 1,022,871,000 | 1,022,725,000
Outstanding letters of credit facility | 1,383,689,000 | 1,593,379,000
Reclamation [Member] |  |
Provisions [Line Items] |  |
Beginning of year | 1,061,096,000 |
Changes in estimates and discount rates [Abstract] |  |
Capitalized in property, plant and equipment | 2,166,000 |
Recognized in earnings | (7,509,000) |
Provisions used during the period | (37,194,000) |
Unwinding of discount | 39,096,000 |
Effect of movements in exchange rates | (6,488,000) |
End of period | 1,051,167,000 |
Current | 35,356,000 |
Non-current | 1,015,811,000 |
Estimated total future decommissioning and reclamation costs | $ 1,356,018,000 | 1,356,092,000
Description of period, majority of expenditures will occur after | 2027 |
Outstanding letters of credit facility | $ 1,060,769,000 | 1,035,348,000
Reclamation [Member] | Uranium [member] |  |
Provisions [Line Items] |  |
Beginning of year | 870,877,000 |
Changes in estimates and discount rates [Abstract] |  |
End of period | 874,773,000 |
Reclamation [Member] | Fuel Services [Member] |  |
Provisions [Line Items] |  |
Beginning of year | 190,219,000 |
Changes in estimates and discount rates [Abstract] |  |
End of period | 176,394,000 |
Waste Disposal [Member] |  |
Provisions [Line Items] |  |
Beginning of year | 9,934,000 |
Changes in estimates and discount rates [Abstract] |  |
Capitalized in property, plant and equipment | 0 |
Recognized in earnings | 2,148,000 |
Provisions used during the period | (1,788,000) |
Unwinding of discount | 523,000 |
Effect of movements in exchange rates | 0 |
End of period | 10,817,000 |
Current | 3,757,000 |
Non-current | $ 7,060,000 |
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 | $ 9,681,000 | $ 8,919,000

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