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v3.25.1

Finance Expense (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2024
Finance Cost [Abstract] |
Finance Expense |
|  | For the years ended
|  |  | December 31, 2024 | December 31, 2023
Interest expense (i) |  |  | ($4.1) |  | ($3.6) |
Lease liability interest (i) |  |  | (1.4) |  | — |
Accretion on reclamation provision |  |  | (8.9) |  | (6.7) |
Interest income |  |  | 12.6 |  | 7.8 |
Other (i) |  |  | (2.0) |  | — |
|  |  | ($3.8) |  | ($2.5) |

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- Definition Borrowing Costs [Abstract] + References No definition available. + Details
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Namespace Prefix: | agi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Finance Costs + References No definition available. + Details
Name: | agi_FinanceCostsTableTextBlock
Namespace Prefix: | agi_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration