XML 76 R54.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Summary of Significant Accounting Policies - Useful Lives (Details) | 12 Months Ended
--- | ---
Dec. 31, 2024
Minimum | Mobile equipment |
Disclosure of detailed information about property, plant and equipment [table] |
Useful life measured as period of time, property, plant and equipment | 2 years
Minimum | Other equipment |
Disclosure of detailed information about property, plant and equipment [table] |
Useful life measured as period of time, property, plant and equipment | 2 years
Minimum | Vehicles |
Disclosure of detailed information about property, plant and equipment [table] |
Useful life measured as period of time, property, plant and equipment | 3 years
Minimum | Buildings |
Disclosure of detailed information about property, plant and equipment [table] |
Useful life measured as period of time, property, plant and equipment | 7 years
Minimum | Office equipment |
Disclosure of detailed information about property, plant and equipment [table] |
Useful life measured as period of time, property, plant and equipment | 2 years
Maximum | Mobile equipment |
Disclosure of detailed information about property, plant and equipment [table] |
Useful life measured as period of time, property, plant and equipment | 10 years
Maximum | Other equipment |
Disclosure of detailed information about property, plant and equipment [table] |
Useful life measured as period of time, property, plant and equipment | 20 years
Maximum | Vehicles |
Disclosure of detailed information about property, plant and equipment [table] |
Useful life measured as period of time, property, plant and equipment | 7 years
Maximum | Buildings |
Disclosure of detailed information about property, plant and equipment [table] |
Useful life measured as period of time, property, plant and equipment | 20 years
Maximum | Office equipment |
Disclosure of detailed information about property, plant and equipment [table] |
Useful life measured as period of time, property, plant and equipment | 8 years

X
- Definition Schedule disclosing information related to details of property, plant and equipment. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2024-01-01 -Paragraph 73 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2024-en-r&anchor=para_73&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The useful life, measured as period of time, used for property, plant and equipment. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2024-01-01 -Paragraph 73 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2024-en-r&anchor=para_73_c&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_UsefulLifeMeasuredAsPeriodOfTimePropertyPlantAndEquipment
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=agi_MobileEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=agi_OtherEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_VehiclesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_BuildingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_OfficeEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |