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Provisions (Details) - CAD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Provisions [Line Items] |  |
Beginning of year | $ 913,540,000 |
Changes in estimates and discont rates [Abstract] |  |
Capitalized in property, plant and equipment | 72,701,000 |
Recognized in earnings | 61,306,000 |
Change to equity accounting | (3,049,000) |
Provisions used during the period | (31,311,000) |
Unwinding of discount | 23,681,000 |
Effect of movements in exchange rates | 26,484,000 |
End of period | 1,063,352,000 |
Current | 52,316,000 | $ 38,507,000
Non-current | 1,011,036,000 | 875,033,000
Outstanding letters of credit facility | 1,572,984,000 | 1,474,155,000
Reclamation [Member] |  |
Provisions [Line Items] |  |
Beginning of year | 905,400,000 |
Changes in estimates and discont rates [Abstract] |  |
Capitalized in property, plant and equipment | 72,701,000 |
Recognized in earnings | 59,616,000 |
Change to equity accounting | (3,049,000) |
Provisions used during the period | (30,771,000) |
Unwinding of discount | 23,511,000 |
Effect of movements in exchange rates | 26,484,000 |
End of period | 1,053,892,000 |
Current | 51,171,000 |
Non-current | 1,002,721,000 |
Estimated total future decommissioning and reclamation costs | $ 1,157,208,000 | 1,051,746,000
Description of period, majority of expenditures will occur | 2023 |
Outstanding letters of credit facility | $ 1,050,546,000 | 1,011,613,000
Reclamation [Member] | Uranium [Member] |  |
Provisions [Line Items] |  |
Beginning of year | 669,835,000 |
Changes in estimates and discont rates [Abstract] |  |
End of period | 828,781,000 |
Reclamation [Member] | Fuel Services [Member] |  |
Provisions [Line Items] |  |
Beginning of year | 235,565,000 |
Changes in estimates and discont rates [Abstract] |  |
End of period | 225,111,000 |
Waste Disposal [Member] |  |
Provisions [Line Items] |  |
Beginning of year | 8,140,000 |
Changes in estimates and discont rates [Abstract] |  |
Capitalized in property, plant and equipment | 0 |
Recognized in earnings | 1,690,000 |
Change to equity accounting | 0 |
Provisions used during the period | (540,000) |
Unwinding of discount | 170,000 |
Effect of movements in exchange rates | 0 |
End of period | 9,460,000 |
Current | 1,145,000 |
Non-current | 8,315,000 |
Waste Disposal [Member] | Fuel Services [Member] |  |
Changes in estimates and discont rates [Abstract] |  |
Estimated total future decommissioning and reclamation costs | $ 9,617,000 | $ 8,239,000,000

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