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Provisions (Details) - CAD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Provisions [Line Items] |  |
Beginning of year | $ 1,063,352,000 |
Changes in estimates and discont rates [Abstract] |  |
Capitalized in property, plant and equipment | 22,151,000 |
Recognized in earnings | 3,377,000 |
Provisions used during the period | (32,390,000) | $ (31,311,000)
Unwinding of discount | 20,789,000 |
Effect of movements in exchange rates | (16,801,000) |
End of period | 1,060,478,000 | 1,063,352,000
Current | 56,248,000 | 52,316,000
Non-current | 1,004,230,000 | 1,011,036,000
Outstanding letters of credit facility | 1,528,603,000 | 1,572,984,000
Reclamation [Member] |  |
Provisions [Line Items] |  |
Beginning of year | 1,053,892,000 |
Changes in estimates and discont rates [Abstract] |  |
Capitalized in property, plant and equipment | 22,151,000 |
Recognized in earnings | 2,732,000 |
Provisions used during the period | (31,933,000) |
Unwinding of discount | 20,634,000 |
Effect of movements in exchange rates | (16,801,000) |
End of period | 1,050,675,000 | 1,053,892,000
Current | 54,806,000 |
Non-current | 995,869,000 |
Estimated total future decommissioning and reclamation costs | $ 1,127,487,000 | 1,157,208,000
Description of period, majority of expenditures will occur | 2024 |
Outstanding letters of credit facility | $ 994,129,000 | 1,050,546,000
Reclamation [Member] | Uranium [Member] |  |
Provisions [Line Items] |  |
Beginning of year | 828,781,000 |
Changes in estimates and discont rates [Abstract] |  |
End of period | 831,352,000 | 828,781,000
Reclamation [Member] | Fuel Services [Member] |  |
Provisions [Line Items] |  |
Beginning of year | 225,111,000 |
Changes in estimates and discont rates [Abstract] |  |
End of period | 219,323,000 | 225,111,000
Waste Disposal [Member] |  |
Provisions [Line Items] |  |
Beginning of year | 9,460,000 |
Changes in estimates and discont rates [Abstract] |  |
Capitalized in property, plant and equipment | 0 |
Recognized in earnings | 645,000 |
Provisions used during the period | (457,000) |
Unwinding of discount | 155,000 |
Effect of movements in exchange rates | 0 |
End of period | 9,803,000 | 9,460,000
Current | 1,442,000 |
Non-current | 8,361,000 |
Waste Disposal [Member] | Fuel Services [Member] |  |
Changes in estimates and discont rates [Abstract] |  |
Estimated total future decommissioning and reclamation costs | $ 8,451,000 | $ 9,617,000

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