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FINANCIAL INSTRUMENTS - Hedging Instruments and Hedged Forecast Transactions (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Disclosure of detailed information about financial instruments [line items] |  |
Accumulated cash flow hedge fair reserve (before tax) | $ 54.7 | $ 30.6
Hedging instruments | 54.7 | 30.6
Hedged items premiums paid | (54.7) | (30.6)
Canadian dollar contracts | Cash flow hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Accumulated cash flow hedge fair reserve (before tax) | 23.4 | 32.7
Hedging instruments | 23.4 | 32.7
Hedged items premiums paid | (23.4) | (32.7)
Oil contracts | Cash flow hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Accumulated cash flow hedge fair reserve (before tax) | 31.3 | (2.1)
Hedging instruments | 31.3 | (2.1)
Hedged items premiums paid | (31.3) | 2.1
Gold price contracts | Cash flow hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Accumulated cash flow hedge fair reserve (before tax) | 0.0 | 0.0
Hedging instruments | 0.0 | 0.0
Hedged items premiums paid | $ 0.0 | $ 0.0

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- Definition The gain (loss) on the change in fair value of the hedged item used as a basis for recognising hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 24B -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_24B_a_iv&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 24B -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_24B_b_i&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The gain (loss) on the change in fair value of the hedging instrument used as a basis for recognising hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 24A -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_24A_c&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition A component of equity representing the reserve of cash flow hedges in relation to continuing hedges. [Refer: Reserve of cash flow hedges] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 24B -Subparagraph b -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_24B_b_ii&doctype=Standard -URIDate 2021-03-24 + Details
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