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INVESTMENT IN ASSOCIATE (Details) $ / shares in Units, shares in Millions, $ in Millions, $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 28, 2021 USD ($) shares | Jan. 28, 2021 CAD ($) $ / shares shares | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Disclosure of associates [line items] |  |  |  |  |
Investment in associate |  |  | $ 0.0 | $ 9.0 | $ 10.0
Investments In Subsidiaries, Joint Ventures And Associates, Foreign Exchange Gain (Loss) |  |  | (0.7) | 0.6 |
Share of net loss from investment in associate, net of income taxes |  |  | (0.6) | $ (1.6) |
Investments in subsidiaries, purchase of additional shares reported in separate financial statements |  |  | 1.7 |  |
Sale of investment |  |  | $ (9.4) |  |
INV Metals |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |
Proportion of ownership interest in associate | 35.50% | 35.50% | 0.00% | 35.50% |
Additional associate shares acquired | shares | 4.8 | 4.8 |  |  |
Additional associate shares purchased (in cad per share) | $ / shares |  | $ 0.45 |  |  |
Purchase of additional shares of associate | $ 1.7 | $ 2.2 |  |  |

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