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INCOME TAX EXPENSE (RECOVERY) - Unrecognized deferred tax assets and liabilities and company's non-capital losses (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Reconciliation of changes in deferred tax liability (asset) |  |
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
Unrecognized deferred tax assets and liabilities |  |
Aggregated tempoarary differences associated with investments in subsidiaries | 6,500.0 | 6,500.0
Deductible temporary differences | 777.0 | 721.4
Tax losses | 505.4 | $ 458.5
Canada | 2018 - 2037 |  |
Non-capital losses that can be applied against future taxable profit |  |
Unused tax losses | 804.2 |
United States | 2018 - 2037 |  |
Non-capital losses that can be applied against future taxable profit |  |
Unused tax losses | 42.8 |
Chile | No expiry |  |
Non-capital losses that can be applied against future taxable profit |  |
Unused tax losses | 171.4 |
Mauritania | 2018 - 2021 |  |
Non-capital losses that can be applied against future taxable profit |  |
Unused tax losses | 21.2 |
Other | Various |  |
Non-capital losses that can be applied against future taxable profit |  |
Unused tax losses | $ 59.9 |

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- Definition The amount of tax expense or income relating to changes in deferred tax liabilities and deferred tax assets, recognised in profit or loss. [Refer: Deferred tax assets; Deferred tax expense (income); Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_g_ii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_g_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of income tax relating to amounts recognised in other comprehensive income. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph ab -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_ab&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 90 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_90&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The aggregate amount of temporary differences associated with investments in subsidiaries, branches and associates and interests in joint arrangements, for which deferred tax liabilities have not been recognised as a result of satisfying both of the following conditions: (a) the parent, investor, joint venturer or joint operator is able to control the timing of the reversal of the temporary difference; and (b) it is probable that the temporary difference will not reverse in the foreseeable future. [Refer: Associates [member]; Subsidiaries [member]; Temporary differences [member]; Investments in subsidiaries] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_f&doctype=Standard -URIDate 2017-03-09 + Details
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