XML 63 R29.htm IDEA: XBRL DOCUMENT
v3.24.1

Amounts Receivable (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2023
Subclassifications of assets, liabilities and equities [abstract] |
Schedule of Receivables |
| December 31, 2023 | December 31, 2022
Sales tax receivables |  |
Canada | $12.2 |  | $15.1 |
Mexico | 35.0 |  | 16.4 |
Other | 0.7 |  | 1.1 |
Other receivables | 5.5 |  | 4.6 |
| $53.4 |  | $37.2 |

X
- Definition Schedule of Receivables [Table Text Block] + References No definition available. + Details
Name: | agi_ScheduleofReceivablesTableTextBlock
Namespace Prefix: | agi_
Data Type: | dtr-types1:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | ifrs-full_SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration