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INCOME TAX EXPENSE (RECOVERY) - Summary of the components of deferred income tax (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Income tax expense |  |  |
Deferred tax assets | $ 131.4 | $ 191.7 |
Deferred tax liabilities - net | 222.3 | 296.2 | $ 422.5
Accrued expenses and other |  |  |
Income tax expense |  |  |
Deferred tax assets | 28.3 | 39.3 |
Deferred tax liabilities | 4.9 | 14.5 |
Property, plant and equipment |  |  |
Income tax expense |  |  |
Deferred tax assets | 43.3 | 25.5 |
Deferred tax liabilities | 316.8 | 442.0 |
Reclamation and remediation obligations |  |  |
Income tax expense |  |  |
Deferred tax assets | 50.2 | 118.1 |
Inventory capitalization |  |  |
Income tax expense |  |  |
Deferred tax assets | 3.4 | 8.8 |
Deferred tax liabilities | 32.0 | $ 31.4 |
Non-capital loss |  |  |
Income tax expense |  |  |
Deferred tax assets | $ 6.2 |  |

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