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INCOME TAX EXPENSE (RECOVERY) - Components of deferred tax (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Income tax expense |  |  |
Deferred tax assets | $ 190.1 | $ 158.1 |
Deferred tax liabilities - net | 269.3 | 220.2 | $ 222.3
Accrued expenses and other |  |  |
Income tax expense |  |  |
Deferred tax assets | 29.2 | 39.5 |
Deferred tax liabilities | 2.7 | 2.4 |
Property, plant and equipment |  |  |
Income tax expense |  |  |
Deferred tax assets | 26.3 | 25.5 |
Deferred tax liabilities | 423.4 | 340.2 |
Reclamation and remediation obligations |  |  |
Income tax expense |  |  |
Deferred tax assets | 88.4 | 69.5 |
Deferred tax liabilities | 2.8 |  |
Inventory capitalization |  |  |
Income tax expense |  |  |
Deferred tax assets | 11.5 | 4.3 |
Deferred tax liabilities | 30.5 | 35.7 |
Non-capital loss |  |  |
Income tax expense |  |  |
Deferred tax assets | $ 34.7 | $ 19.3 |

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