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Consolidated Statements of Changes in Equity - USD ($) $ in Millions | Total | SHARE CAPITAL | SHARE CAPITAL Argonaut Transaction | SHARE CAPITAL Orford Mining Corporation | CONTRIBUTED SURPLUS | ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME | ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME Equity securities | ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME Currency hedging instruments | ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME Fuel Hedging Instruments | DEFICIT
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2022 |  | $ 3,703.8 |  |  | $ 90.7 |  | $ (23.0) | $ (1.9) | $ 0.1 | $ (1,048.6)
Changes in equity [abstract] |  |  |  |  |  |  |  |  |  |
Issuance of shares related to Argonaut Gold Inc ("Argonaut") acquisition (Note 6) |  |  | $ 0.0 |  |  |  |  |  |  |
Manitou acquisition (Note 9) |  |  |  | $ 0.0 |  |  |  |  |  |
Issuance of shares related to share-based compensation |  | 8.4 |  |  |  |  |  |  |  |
Issuance of shares for dividend reinvestment and share purchase plan ("DRIP") |  | 4.1 |  |  |  |  |  |  |  |
Issuance of shares for employee share purchase plan ("ESPP") |  | 5.6 |  |  |  |  |  |  |  |
Transfer from contributed surplus of share-based compensation redeemed |  | 3.9 |  |  | (3.9) |  |  |  |  |
Issuance of shares through flow-through share agreements |  | 0.0 |  |  |  |  |  |  |  |
Exercise of warrants |  | 0.9 |  |  |  |  |  |  |  |
Increase (decrease) through acquisition of subsidiary, equity |  | 13.4 |  |  |  |  |  |  |  |
Cancellation of unexchanged shares |  | (1.5) |  |  |  |  |  |  |  | 1.5
Share-based compensation |  |  |  |  | 4.9 |  |  |  |  |
Distribution of share-based compensation | $ 15.8 |  |  |  | (3.1) |  |  |  |  |
Issuance of replacement warrants and options upon Orford acquisition |  |  |  |  | 0.0 |  |  |  |  |
Net change in fair value of currency hedging instruments, net of taxes | 8.3 |  |  |  |  |  |  | 8.3 |  |
Net change in fair value of fuel hedging instruments, net of tax | (0.2) |  |  |  |  |  |  |  | (0.2) |
Realized (gain) loss on disposition of equity securities, reclassified to deficit, net of tax |  |  |  |  |  |  | 0.3 |  |  |
Net change in unrealized gain (loss) on equity securities, net of taxes | 10.5 |  |  |  |  |  | (10.5) |  |  |
Dividends (Note 18(d)) |  | (4.1) |  |  |  |  |  |  |  | (39.4)
Reclassification of realized gain (loss) on disposition of equity securities, net of tax |  |  |  |  |  |  |  |  |  | (0.3)
Net earnings | 210.0 |  |  |  |  |  |  |  |  | 210.0
Ending balance at Dec. 31, 2023 | 2,923.5 | 3,738.6 |  |  | 88.6 | $ (26.9) | (33.2) | 6.4 | (0.1) | (876.8)
Changes in equity [abstract] |  |  |  |  |  |  |  |  |  |
Issuance of shares related to Argonaut Gold Inc ("Argonaut") acquisition (Note 6) |  |  | 360.1 | $ 13.3 |  |  |  |  |  |
Issuance of shares related to share-based compensation |  | 5.6 |  |  |  |  |  |  |  |
Issuance of shares for dividend reinvestment and share purchase plan ("DRIP") |  | 5.8 |  |  |  |  |  |  |  |
Issuance of shares for employee share purchase plan ("ESPP") |  | 6.3 |  |  |  |  |  |  |  |
Transfer from contributed surplus of share-based compensation redeemed |  | 3.0 |  |  | (3.0) |  |  |  |  |
Issuance of shares through flow-through share agreements |  | 6.5 |  |  |  |  |  |  |  |
Exercise of warrants |  | 1.4 |  |  |  |  |  |  |  |
Increase (decrease) through acquisition of subsidiary, equity |  | 0.0 | $ 360.1 |  |  |  |  |  |  |
Cancellation of unexchanged shares |  | (2.1) |  |  |  |  |  |  |  | 2.1
Share-based compensation |  |  |  |  | 5.3 |  |  |  |  |
Distribution of share-based compensation | 14.5 |  |  |  | (3.0) |  |  |  |  |
Issuance of replacement warrants and options upon Orford acquisition |  |  |  |  | 1.4 |  |  |  |  |
Net change in fair value of currency hedging instruments, net of taxes | (11.7) |  |  |  |  |  |  | (11.7) |  |
Net change in fair value of fuel hedging instruments, net of tax | (0.1) |  |  |  |  |  |  |  | (0.1) |
Realized (gain) loss on disposition of equity securities, reclassified to deficit, net of tax |  |  |  |  |  |  | (25.1) |  |  |
Net change in unrealized gain (loss) on equity securities, net of taxes | (26.4) |  |  |  |  |  | 26.4 |  |  |
Dividends (Note 18(d)) |  |  |  |  |  |  |  |  |  | (40.9)
Reclassification of realized gain (loss) on disposition of equity securities, net of tax |  |  |  |  |  |  |  |  |  | 25.1
Net earnings | 284.3 |  |  |  |  |  |  |  |  | 284.3
Ending balance at Dec. 31, 2024 | $ 3,584.2 | $ 4,138.5 |  |  | $ 89.3 | $ (37.4) | $ (31.9) | $ (5.3) | $ (0.2) | $ (606.2)

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