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Income and mining taxes - Deferred income tax (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
DEFERRED TAX ASSETS |  |  |
Deferred tax assets | $ 4.9 | $ 0.0 |
Deferred income tax asset (in respect of Ontario mining tax, net) | (70.0) | (66.8) | $ (69.6)
DEFERRED TAX LIABILITIES |  |  |
Deferred tax liabilities | (74.8) | (66.8) |
Canada |  |  |
DEFERRED TAX ASSETS |  |  |
Deferred tax assets | 335.4 | 285.6 |
Unrecognized deferred tax asset | 330.4 | 285.6 |
Deferred income tax asset (in respect of Ontario mining tax, net) | 5.0 | 0.0 |
DEFERRED TAX LIABILITIES |  |  |
Deferred tax liabilities | (74.8) | (66.8) |
Canada | Capital losses |  |  |
DEFERRED TAX ASSETS |  |  |
Deferred tax assets | 5.7 | 6.0 |
Canada | Property, plant and equipment and Mining interests |  |  |
DEFERRED TAX ASSETS |  |  |
Deferred tax assets | 44.6 | 45.5 |
Canada | Tax credits |  |  |
DEFERRED TAX ASSETS |  |  |
Deferred tax assets | 65.4 | 62.7 |
Canada | Ontario Mining Tax |  |  |
DEFERRED TAX ASSETS |  |  |
Deferred tax assets | 35.7 | 43.5 |
Canada | Non-current derivative financial liabilities |  |  |
DEFERRED TAX ASSETS |  |  |
Deferred tax assets | 184.0 | 127.9 |
Canada | British Columbia Mining Tax |  |  |
DEFERRED TAX LIABILITIES |  |  |
Deferred tax liabilities | $ (74.8) | $ (66.8) |

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