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EQUITY (Tables) | 12 Months Ended
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Dec. 31, 2020
Equity [abstract] |
Disclosure of equity [Table Text Block] |
|  | Common shares (thousands) |
Common shares outstanding at January 1, 2019 |  | 228,431 |
Issued to acquire Yellowhead (Note 14) |  | 17,300 |
Exercise of share options |  | 463 |
Common shares outstanding at December 31, 2019 |  | 246,194 |
Common shares issued |  | 34,322 |
Exercise of share options |  | 1,599 |
Common shares outstanding at December 31, 2020 |  | 282,115 |

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