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Joint operations (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of joint operations [line items] |  |
Ownership | 40.00% | 60.00%
Total assets | $ 8,018,636 | $ 7,778,727
Joint operations [member] |  |
Disclosure of joint operations [line items] |  |
Total assets | 3,106,658 | 3,365,818
Total liabilities | $ 293,676 | 339,795
McArthur River [Member] |  |
Disclosure of joint operations [line items] |  |
Ownership | 69.81% |
Principal place of business | Canada |
Total assets | $ 1,065,562 | 1,121,509
Total liabilities | $ 32,829 | 38,896
Key Lake [Member] |  |
Disclosure of joint operations [line items] |  |
Ownership | 83.33% |
Principal place of business | Canada |
Total assets | $ 537,233 | 482,879
Total liabilities | $ 222,369 | 140,214
Cigar Lake [Member] |  |
Disclosure of joint operations [line items] |  |
Ownership | 50.03% |
Principal place of business | Canada |
Total assets | $ 1,503,863 | 1,531,150
Total liabilities | $ 38,478 | $ 40,687
Inkai [Member] |  |
Disclosure of joint operations [line items] |  |
Ownership | 40.00% | 60.00%
Principal place of business | Kazakhstan |
Total assets | $ 0 | $ 230,280
Total liabilities | $ 0 | $ 119,998
Percentage of interest in advances receivable | 40.00% |

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