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DEFERRED REVENUE - Changes in Deferred Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Revenue From Contract With Customer [Roll Forward] |  |
Contract liabilities at beginning of period | $ 240.8 | $ 189.7
Proceeds from gold prepayment |  | 236.0
Revenue recognized |  | (195.0)
Accretion expense, prepayment on qualifying assets | 10.8 | 10.1
Contract liabilities at end of period | 251.6 | 240.8
Current portion of deferred revenue | 240.7 | 0.0
Deferred revenue | 10.9 | 240.8
Current portion of deferred revenue | 251.6 |
2019 Prepay Arrangement |  |
Revenue From Contract With Customer [Roll Forward] |  |
Contract liabilities at beginning of period | 0.0 | 189.7
Proceeds from gold prepayment |  | 0.0
Revenue recognized |  | (195.0)
Accretion expense, prepayment on qualifying assets | 0.0 | 5.3
Contract liabilities at end of period | 0.0 | 0.0
Current portion of deferred revenue | 0.0 |
Deferred revenue | 0.0 |
Current portion of deferred revenue | 0.0 |
2022 Prepay Arrangements |  |
Revenue From Contract With Customer [Roll Forward] |  |
Contract liabilities at beginning of period | 240.8 | 0.0
Proceeds from gold prepayment |  | 236.0
Revenue recognized |  | 0.0
Accretion expense, prepayment on qualifying assets | 10.8 | 4.8
Contract liabilities at end of period | 251.6 | $ 240.8
Current portion of deferred revenue | 240.7 |
Deferred revenue | 10.9 |
Current portion of deferred revenue | $ 251.6 |

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- Definition The amount of an entity’s obligation to transfer goods or services to a customer for which the entity has received consideration (or the amount is due) from the customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2023-01-01 -Paragraph 105 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2023-en-r&anchor=para_105&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2023-01-01 -Paragraph 116 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2023-en-r&anchor=para_116_a&doctype=Standard -URIDate 2023-03-23 + Details
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