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SHARE CAPITAL (Details) - USD ($) shares in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Share capital [Line Items] |  |  |  |
Balance |  | 578,636 |  | 513,709
Common shares, beginning of Period |  | $ 3,036.5 |  | $ 2,859.0
Issuance of common shares on equity offering | [1] |  |  | 61,740
Issuance of common shares under First Nations agreements |  | 113 |  | 2,767
Exercise of options and vested performance share units |  | 366 |  | 420
Issuance of common shares on equity offering |  | $ 0.3 |  | $ 176.1
Issuance of shares under First Nations agreements and land purchases |  | 0.3 |  | 9.5
Exercise of options and vested performance share units |  | 0.3 |  | 1.4
Reversal of deferred tax recovery |  | $ (1.9) | [1] | $ 0.0
Reversal of deferred tax recovery | [1] | 0 |  |
Balance |  | 579,115 |  | 578,636
Common shares, end of period |  | $ 3,035.2 |  | $ 3,036.5
[1] | 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. This deferred tax recovery was reversed in 2018.

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- Definition The amount of deferred tax expense or income relating to the creation or reversal of temporary differences. [Refer: Temporary differences [member]; Deferred tax expense (income)] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 80 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_80_c&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 106 -Subparagraph d -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_106_d_iii&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 79 -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_79_a_iv&doctype=Standard -URIDate 2018-03-16 + Details
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