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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, 2021 | Dec. 31, 2020
Cash Flow Statement [Abstract] |  |
Finance costs | $ 5.2 | $ 23.3
Share-based compensation | 6.9 | 11.7
Derivative loss | 2.4 | 53.0
Write-down of assets | 4.9 | 3.4
Adjustments for impairment loss (reversal of impairment loss) recognised in profit or loss, inventories | 98.2 | 5.7
Changes in estimates of asset retirement obligations at closed sites | 40.7 | 6.1
Gain on sale of 70% interest in Eastern Borosi property | 0.0 | (4.1)
Share of net loss from investment in associate, net of income taxes | 0.6 | 1.6
Interest income | (4.2) | (8.9)
Fair value of deferred consideration from the sale of Sadiola | (4.6) | 0.0
Effects of exchange rate fluctuation on cash and cash equivalents | 9.7 | (8.7)
Effects of exchange rate fluctuation on restricted cash | 2.9 | (2.7)
Loss on redemption of 7% senior notes | 0.0 | 22.5
Gain on establishment of the Rosebel UJV | 0.0 | (16.9)
Gain on sale of Sadiola | 0.0 | (4.1)
Gain on sale of royalties | (45.9) | 0.0
Gain on sale of investment in INV Metals | (16.1) | 0.0
Insurance recoveries | (10.2) | 0.0
Employee service provision | 2.8 | 2.2
Other | (11.7) | 5.3
Total other non-cash items | $ 81.6 | $ 89.4

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