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INCOME TAX EXPENSE (RECOVERY) - Summary of the components of deferred income tax (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Income tax expense |  |  |
Deferred tax assets | $ 158.1 | $ 131.4 |
Deferred tax liabilities - net | 220.2 | 222.3 | $ 296.2
Accrued expenses and other |  |  |
Income tax expense |  |  |
Deferred tax assets | 39.5 | 28.3 |
Deferred tax liabilities | 2.4 | 4.9 |
Property, plant and equipment |  |  |
Income tax expense |  |  |
Deferred tax assets | 25.5 | 43.3 |
Deferred tax liabilities | 340.2 | 316.8 |
Reclamation and remediation obligations |  |  |
Income tax expense |  |  |
Deferred tax assets | 69.5 | 50.2 |
Inventory capitalization |  |  |
Income tax expense |  |  |
Deferred tax assets | 4.3 | 3.4 |
Deferred tax liabilities | 35.7 | 32.0 |
Non-capital loss |  |  |
Income tax expense |  |  |
Deferred tax assets | $ 19.3 | $ 6.2 |

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