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ACQUISITIONS - Consideration Transferred (Details) $ / shares in Units, $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Sep. 16, 2020 USD ($) shares $ / shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 shares | Sep. 16, 2020 $ / shares
Disclosure of detailed information about business combination [line items] |  |  |  |
Increase (decrease) through acquisition of subsidiary, equity |  | $ 2,649,355 |  |
Deferred Share Units |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Issued in connection with Alacer acquisition (in units) | shares |  | 234,440 | 0 |
Restricted Share Units |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Issued in connection with Alacer acquisition (in units) | shares |  | 998,901 | 0 |
Performance Share Units |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Issued in connection with Alacer acquisition (in units) | shares |  | 985,489 | 0 |
Issued capital |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Increase (decrease) through acquisition of subsidiary, equity |  | $ 2,127,284 |  |
Alacer |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Share consideration | $ 2,127,284 |  |  |
Total identifiable net assets | 2,179,647 |  |  |
Liabilities from share-based payment transactions related to other equity instruments | 23,800 |  |  |
Non-current liabilities from share-based payment transactions related to other equity instruments | 13,200 |  |  |
Alacer | Restricted Share Units, Performance Share Units and Deferred Share Units |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Share consideration | $ 52,363 |  |  |
Alacer | Issued capital |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Common shares issued in acquisition (in shares) | shares | 95,699,911 |  |  |
Share price of common stock issued from business acquisition (USD per share) | (CAD per share) | (per share) | $ 22.22 |  |  | $ 29.31
Share price of other equity instruments issued from business acquisition (USD per share) | (CAD per share) | (per share) | $ 7.21 |  |  | $ 9.51
Increase (decrease) through acquisition of subsidiary, equity | $ 15,400 |  |  |
Alacer | Issued capital | Deferred Share Units |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Issued in connection with Alacer acquisition (in units) | shares | 1,158,071 |  |  |
Alacer | Issued capital | Restricted Share Units |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Issued in connection with Alacer acquisition (in units) | shares | 3,570,261 |  |  |
Alacer | Issued capital | Performance Share Units |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Issued in connection with Alacer acquisition (in units) | shares | 3,463,023 |  |  |

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