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CAPITAL AND FINANCIAL RISK MANAGEMENT - Currency risk management impact on OCI (Details) - Currency risk $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($)
Capital and financial risk management |
Percentage of strengthening in U.S. dollar | 10.00%
Foreign currency forward and collar contracts |
Capital and financial risk management |
Percentage of strengthening in U.S. dollar | 10.00%
Foreign currency forward and collar contracts | Canadian dollar |
Capital and financial risk management |
Strengthening in U.S dollar Effect on OCI before taxes, gain (loss) | $ (3.9)
Weakening in U.S dollar Effect on OCI before taxes, gain (loss) | 4.8
Foreign currency forward and collar contracts | Brazilian real |
Capital and financial risk management |
Strengthening in U.S dollar Effect on OCI before taxes, gain (loss) | (10.7)
Weakening in U.S dollar Effect on OCI before taxes, gain (loss) | 13.3
Foreign currency forward and collar contracts | Russian rouble |
Capital and financial risk management |
Strengthening in U.S dollar Effect on OCI before taxes, gain (loss) | (3.2)
Weakening in U.S dollar Effect on OCI before taxes, gain (loss) | $ 6.5

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- Definition The amount of increase (decrease) in the fair value measurement of assets, recognised in other comprehensive income before tax, due to a reasonably possible decrease in an unobservable input. [Refer: Tax income (expense)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 13 -IssueDate 2019-01-01 -Paragraph 93 -Subparagraph h -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2019-en-r&anchor=para_93_h_ii&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of increase (decrease) in the fair value measurement of assets, recognised in other comprehensive income before tax, due to a reasonably possible increase in an unobservable input. [Refer: Tax income (expense)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 13 -IssueDate 2019-01-01 -Paragraph 93 -Subparagraph h -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2019-en-r&anchor=para_93_h_ii&doctype=Standard -URIDate 2019-03-27 + Details
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