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INCOME TAXES - Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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Deferred tax assets and liabilities [abstract] |  |  |
Deferred income tax assets | $ 0.0 | $ 0.0 |
Deferred income tax liabilities | (61.2) | (168.8) |
Net deferred income tax liabilities | (61.2) | (168.8) | $ (180.6)
Deductible temporary differences for which no deferred tax asset is recognised | 1,818.5 | 1,831.3 |
Before Offset Amount |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Deferred income tax assets | 249.3 | 90.6 |
Deferred income tax liabilities | (310.5) | (259.4) |
Non-capital losses |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Deferred income tax assets | 210.4 | 58.6 | 22.5
Deductible temporary differences for which no deferred tax asset is recognised | 457.2 | 886.1 |
Non-capital losses | Before Offset Amount |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Deferred income tax assets | 210.4 | 58.6 |
Asset retirement obligations |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Deferred income tax assets | 1.7 | 1.2 | 0.0
Deductible temporary differences for which no deferred tax asset is recognised | 254.2 | 186.5 |
Asset retirement obligations | Before Offset Amount |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Deferred income tax assets | 1.7 | 1.2 |
Other assets | Before Offset Amount |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Deferred income tax assets | 37.2 | 30.8 |
Property, plant and equipment |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Deferred income tax liabilities | (281.0) | (225.6) | (197.1)
Property, plant and equipment | Before Offset Amount |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Deferred income tax liabilities | (281.0) | (225.6) |
Royalty interests |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Deferred income tax liabilities | (0.4) | (4.6) | (5.3)
Royalty interests | Before Offset Amount |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Deferred income tax liabilities | (0.4) | (4.6) |
Marketable securities |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Deferred income tax liabilities | 0.0 | (0.2) | 0.0
Marketable securities | Before Offset Amount |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Deferred income tax liabilities | 0.0 | (0.2) |
Inventory and reserves |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Deferred income tax liabilities | (7.4) | (18.5) | (26.4)
Inventory and reserves | Before Offset Amount |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Deferred income tax liabilities | (7.4) | (18.5) |
Other liabilities |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Deferred income tax liabilities | (21.7) | (10.5) | (2.4)
Other liabilities | Before Offset Amount |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Deferred income tax liabilities | (21.7) | (10.5) |
Net capital losses |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Deductible temporary differences for which no deferred tax asset is recognised | 67.9 | 77.7 |
Exploration and evaluation assets |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Deductible temporary differences for which no deferred tax asset is recognised | 996.0 | 638.3 |
Mining duties |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Deductible temporary differences for which no deferred tax asset is recognised | 13.8 | 13.5 |
Other deductible temporary differences |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Deferred income tax assets | 37.2 | 30.8 | $ 28.1
Deductible temporary differences for which no deferred tax asset is recognised | $ 29.4 | $ 29.2 |

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