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INCOME TAX EXPENSE - Components of deferred tax (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Income tax expense |  |  |
Deferred tax assets | $ 254.8 | $ 190.1 |
Deferred tax liabilities - net | 485.1 | 269.3 | $ 220.2
Accrued expenses and other |  |  |
Income tax expense |  |  |
Deferred tax assets | 51.1 | 29.0 |
Deferred tax liabilities | 2.4 | 2.7 |
Property, plant and equipment |  |  |
Income tax expense |  |  |
Deferred tax assets | 5.2 |  |
Deferred tax liabilities | 677.5 | 423.4 |
Reclamation and remediation obligations |  |  |
Income tax expense |  |  |
Deferred tax assets | 123.3 | 109.6 |
Deferred tax liabilities |  | 2.8 |
Inventory capitalization |  |  |
Income tax expense |  |  |
Deferred tax assets | 20.8 | 16.8 |
Deferred tax liabilities | 60.0 | 30.5 |
Non-capital loss |  |  |
Income tax expense |  |  |
Deferred tax assets | $ 54.4 | $ 34.7 |

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