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INCOME AND MINING TAXES - Deferred income tax (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
DEFERRED TAX LIABILITIES |  |  |
Deferred tax liabilities | $ (48.3) | $ (56.3) |
Deferred tax assets and liabilities |  |  |
Deferred income tax liabilities, net | (48.3) | (56.3) | $ (78.0)
Canada [Member] |  |  |
Deferred tax assets |  |  |
Deferred tax assets | 255.3 | 261.4 |
DEFERRED TAX LIABILITIES |  |  |
Deferred tax liabilities | (48.3) | (56.3) |
Unrecognized Deferred Tax Assets | (255.3) | (261.4) |
Deferred tax assets and liabilities |  |  |
Deferred income tax liabilities, net | (48.3) | (56.3) |
Canada [Member] | Capital Losses [Member] |  |  |
Deferred tax assets |  |  |
Deferred tax assets | 18.4 | 37.1 |
Canada [Member] | Property, plant and equipment and Mining interests [Member] |  |  |
Deferred tax assets |  |  |
Deferred tax assets | 122.7 | 110.8 |
Canada [Member] | Tax credits [Member] |  |  |
Deferred tax assets |  |  |
Deferred tax assets | 49.9 | 47.5 |
Canada [Member] | Ontario Mining Tax [Member] |  |  |
Deferred tax assets |  |  |
Deferred tax assets | 45.4 | 53.9 |
Canada [Member] | Other deferred tax assets [Member] |  |  |
Deferred tax assets |  |  |
Deferred tax assets | 18.9 | 12.1 |
Canada [Member] | British Columbia Mining Tax [Member] |  |  |
DEFERRED TAX LIABILITIES |  |  |
Deferred tax liabilities | $ (48.3) | $ (56.3) |

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