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ASSETS AND LIABILITIES HELD FOR SALE AND DISCONTINUED OPERATIONS - Summary of Consideration (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Dec. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure of non-current assets held for sale and discontinued operations [Line Items] |  |  |
Deferred consideration - litigation settlement |  | $ 1.2 | $ 1.2
Gains on disposals, net |  | $ 0.0 | 4.1
Sadiola |  |  |
Disclosure of non-current assets held for sale and discontinued operations [Line Items] |  |  |
Cash consideration upon closing |  |  | 25.0
Additional consideration |  |  | 1.8
Deferred consideration - milestone payments |  |  | 14.3
Deferred consideration - litigation settlement |  |  | 1.2
Total assets, consideration received |  |  | 42.3
Investment in Sadiola, net of dividend received |  |  | (37.4)
Gain on disposal |  |  | 4.9
Transaction costs |  |  | (0.8)
Gains on disposals, net | $ 4.1 |  | $ 4.1

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