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Deferred Revenue - (Summary of Deferred Revenue) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2024 USD ($)
Deferred Revenue [Abstract] |
Deferred revenue, beginning balance | $ 0.0
Advanced consideration from gold sale prepayment agreement, net of transaction costs | 111.1
Accretion expense | 5.5
Deferred revenue, ending balance | $ 116.6

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- Definition Accretion Expense + References No definition available. + Details
Name: | agi_AccretionExpense
Namespace Prefix: | agi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Advanced Considerations From Prepayment Agreement + References No definition available. + Details
Name: | agi_AdvancedConsiderationsFromPrepaymentAgreement
Namespace Prefix: | agi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- Definition The amount of current deferred income including current contract liabilities. [Refer: Deferred income including contract liabilities] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 78 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_78&doctype=Standard -URIDate 2024-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant