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Provisions (Details) - CAD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Provisions [Line Items] |  |
Beginning of year | $ 1,060,478,000 |
Changes in estimates and discont rates [Abstract] |  |
Capitalized in property, plant and equipment | 127,637,000 |
Recognized in earnings | 23,771,000 |
Provisions used during the period | (17,640,000) |
Unwinding of discount | 14,403,000 |
Effect of movements in exchange rates | (9,727,000) |
End of period | 1,198,922,000 |
Current | 42,535,000 | $ 56,248,000
Non-current | 1,156,387,000 | 1,004,230,000
Outstanding letters of credit facility | 1,596,488,000 | 1,528,603,000
Reclamation [Member] |  |
Provisions [Line Items] |  |
Beginning of year | 1,050,675,000 |
Changes in estimates and discont rates [Abstract] |  |
Capitalized in property, plant and equipment | 127,637,000 |
Recognized in earnings | 23,921,000 |
Provisions used during the period | (17,272,000) |
Unwinding of discount | 14,366,000 |
Effect of movements in exchange rates | (9,727,000) |
End of period | 1,189,600,000 |
Current | 40,760,000 |
Non-current | 1,148,840,000 |
Estimated total future decommissioning and reclamation costs | $ 1,130,495,000 | 1,127,487,000
Description of period, majority of expenditures will occur after | 2026 |
Outstanding letters of credit facility | $ 1,021,142,000 | 994,129,000
Reclamation [Member] | Uranium [Member] |  |
Provisions [Line Items] |  |
Beginning of year | 831,352,000 |
Changes in estimates and discont rates [Abstract] |  |
End of period | 937,992,000 |
Reclamation [Member] | Fuel Services [Member] |  |
Provisions [Line Items] |  |
Beginning of year | 219,323,000 |
Changes in estimates and discont rates [Abstract] |  |
End of period | 251,608,000 |
Waste Disposal [Member] |  |
Provisions [Line Items] |  |
Beginning of year | 9,803,000 |
Changes in estimates and discont rates [Abstract] |  |
Capitalized in property, plant and equipment | 0 |
Recognized in earnings | (150,000) |
Provisions used during the period | (368,000) |
Unwinding of discount | 37,000 |
Effect of movements in exchange rates | 0 |
End of period | 9,322,000 |
Current | 1,775,000 |
Non-current | 7,547,000 |
Waste Disposal [Member] | Fuel Services [Member] |  |
Changes in estimates and discont rates [Abstract] |  |
Estimated total future decommissioning and reclamation costs | $ 8,044,000 | $ 8,451,000

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