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CASH FLOW ITEMS - Other Non-Cash Items, Operating Activities (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Disclosure of maturity analysis of undiscounted cash outflows to repurchase derecognised financial assets or amounts payable to transferee in respect of transferred assets [line items] |  |
Share-based compensation | $ 5.7 | $ 6.2
9.7% of Côté Gold pre-Commercial Production gold received by SMM | (18.4) | 0.0
9.7% of Côté Gold expenses funded by SMM | 6.6 | 0.0
Write-down (reversal) of inventories | 3.6 | 5.9
Changes in estimates of asset retirement obligations at closed sites | (13.4) | 9.7
Derivative (gain) loss | (20.4) | (22.9)
Interest income | (16.1) | (27.8)
Gain on sale of Pitangui and Acurui Projects | (34.1) | (109.1)
Effects of exchange rate fluctuation on cash and cash equivalents | 7.0 | (1.3)
Effects of exchange rate fluctuation on restricted cash | 4.1 | (2.8)
Insurance recoveries | (27.3) | (0.6)
Other | (12.0) | 6.6
Total other non-cash items | (80.6) | (42.5)
Pitangui and Acurui Projects |  |
Disclosure of maturity analysis of undiscounted cash outflows to repurchase derecognised financial assets or amounts payable to transferee in respect of transferred assets [line items] |  |
Gain on sale of Pitangui and Acurui Projects | $ 0.0 | $ (15.5)

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- Definition Adjustments for gain (loss) on disposals investments in subsidiaries, joint ventures and associates to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Total for all associates [member]; Total for all joint ventures [member]; Total for all subsidiaries [member]; Investments in subsidiaries, joint ventures and associates reported in separate financial statements; Profit (loss)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 20 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_20&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of insurance revenue recognised in the period related to the allocation of the portion of the premiums that relate to the recovery of insurance acquisition cash flows. [Refer: Insurance revenue; Increase (decrease) through insurance acquisition cash flows, insurance contracts liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2024-01-01 -Paragraph 106 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2024-en-r&anchor=para_106_b&doctype=Standard -URIDate 2024-03-27 + Details
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