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SHARE CAPITAL (Details) - USD ($) shares in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Share capital [Line Items] |  |  |  |
Balance |  | 513,709 |  | 509,469
Exercise of options and vested performance share units |  | 420 | [1] | 3,827
Issuance of common shares on equity offering |  | 61,740 | [2] | 329
Issuance of common shares under First Nations agreements |  | 2,767 |  |
Acquisition of Bayfield |  |  |  | 84
Balance |  | 578,636 |  | 513,709
Balance, beginning of period |  | $ 2,859.0 |  | $ 2,841.0
Exercise of options and vested performance share units |  | 1.4 | [1] | 16.3
Issuance of common shares on equity offering | [2] | 166.6 |  |
Issuance of shares under First Nations agreements and land purchases |  | 9.5 |  | 1.3
Acquisition of Bayfield |  |  |  | 0.4
Balance, end of period |  | $ 3,036.5 |  | $ 2,859.0
[1] | Stock options
[2] | On March 10, 2017, the Company closed a bought deal financing and related agreements and issued 61.7 million common shares at a price of $2.80 per share. Proceeds of $172.9 million are included within equity net of equity issuance costs of $8.2 million and the associated deferred tax recovery of $1.9 million.

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- Definition The increase (decrease) in equity resulting from the acquisition of subsidiaries. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_106_d&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase in equity through the issue of equity instruments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 106 -Subparagraph d -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_106_d_iii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The nominal value of capital issued. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 78 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_78_e&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The number of shares issued by the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_106_d&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The number of shares that have been authorised and issued, reduced by treasury shares held. [Refer: Treasury shares] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 79 -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_79_a_iv&doctype=Standard -URIDate 2017-03-09 + Details
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