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INCOME TAX EXPENSE (RECOVERY) (Tables) | 12 Months Ended
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Dec. 31, 2017
INCOME TAX EXPENSE (RECOVERY) |
Schedule of components of the current and deferred tax expense |
|  | Years ended December 31, |
|  | 2017 |  | 2016 |
Current tax expense (recovery) |  |  |  |  |
Current period |  | $ | 63.2 |  | $ | 223.9 |
Adjustment for prior period |  | (10.0 | ) | (24.6 | )
Deferred tax expense (recovery) |  |  |  |  |
Origination and reversal of temporary differences |  | (83.0 | ) | (143.6 | )
Impact of changes in tax rate |  | (0.1 | ) | — |
Change in unrecognized deductible temporary differences |  | 7.5 |  | (6.7 | )
Recognition of previously unrecognized tax losses |  | (0.8 | ) | 0.6 |
Total tax expense (recovery) |  | $ | (23.2 | ) | $ | 49.6 |
Schedule of reconciliation of the combined Canadian federal and provincial statutory income tax rate to the effective tax rate |
|  | 2017 |  | 2016 |
Combined statutory income tax rate |  | 26.5 | % | 26.5 | %
Increase (decrease) resulting from: |  |  |  |  |
Mining taxes |  | 5.0 | % | 4.4 | %
Resource allowance and depletion |  | 0.0 | % | 1.1 | %
Difference in foreign tax rates and foreign exchange on deferred income taxes within income tax expense |  | (19.1 | )% | 94.0 | %
Benefit of losses not recognized |  | 33.9 | % | (160.1 | )%
Recognition of tax attributes not previously benefited |  | (3.5 | )% | (44.0 | )%
Under (over) provided in prior periods |  | (8.9 | )% | (8.2 | )%
Income not subject to tax |  | (3.0 | )% | 109.2 | %
Effect of non-taxable impairment reversal |  | (17.6 | )% | 0.0 | %
Enacted rate change |  | 0.1 | % | 0.0 | %
Accounting expenses disallowed for tax |  | 9.8 | % | (17.2 | )%
Taxes on repatriation of foreign earnings |  | 3.8 | % | (79.9 | )%
AMT Credit recovery due to U.S. Tax Reform |  | (29.7 | )% | 0.0 | %
Other |  | (2.8 | )% | (9.2 | )%
Effective tax rate |  | (5.5 | )% | (83.4 | )%
Schedule of summary of the components of deferred income tax and movement in net deferred tax liabilities |
|  | December 31, 2017 |  | December 31, 2016 |
Deferred tax assets |  |  |  |  |
Accrued expenses and other |  | $ | 28.3 |  | $ | 39.3 |
Property, plant and equipment |  | 43.3 |  | 25.5 |
Reclamation and remediation obligations |  | 50.2 |  | 118.1 |
Inventory capitalization |  | 3.4 |  | 8.8 |
Non-capital loss |  | 6.2 |  | — |
|  | 131.4 |  | 191.7 |
Deferred tax liabilities |  |  |  |  |
Accrued expenses and other |  | 4.9 |  | 14.5 |
Property, plant and equipment |  | 316.8 |  | 442.0 |
Inventory capitalization |  | 32.0 |  | 31.4 |
Deferred tax liabilities - net |  | $ | 222.3 |  | $ | 296.2 |
Schedule of unrecognized deferred tax assets and company's non-capital losses |
|  | December 31, 2017 |  | December 31, 2016 |
Balance at the beginning of the period |  | $ | 296.2 |  | $ | 422.5 |
Recognized in profit/loss |  | (76.4 | ) | (149.7 | )
Recognized in OCI |  | (0.8 | ) | 9.5 |
Other |  | 3.3 |  | 13.9 |
Balance at the end of the period |  | $ | 222.3 |  | $ | 296.2 |
|  | December 31, 2017 |  | December 31, 2016 |
Deductible temporary differences |  | $ | 777.0 |  | $ | 721.4 |
Tax losses |  | 505.4 |  | 458.5 |
Country |  | Type |  | Amount |  | Expiry Date |
Canada |  | Net operating losses |  | $ | 804.2 |  | 2018 - 2037 |
United States(a) |  | Net operating losses |  | 42.8 |  | 2018 - 2037 |
Chile |  | Net operating losses |  | 171.4 |  | No expiry |
Mauritania |  | Net operating losses |  | 21.2 |  | 2018 - 2021 |
Other |  | Net operating losses |  | 59.9 |  | Various |
| (a) |  | Utilization of the United States loss carry forwards will be limited in any year as a result of the previous changes in ownership.

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- Definition The disclosure of detailed information about reconciliation using percentage or amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References No definition available. + Details
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- Definition The disclosure of detailed information about components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References No definition available. + Details
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