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Mineral Property, Plant and Equipment (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Construction in progress | $ 175.4 | $ 155.8 | $ 175.4
Payments for purchase of outstanding royalty | $ 15.7 | $ 0.0 | $ 15.7

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- Definition Payments for Purchase of Outstanding Royalty + References No definition available. + Details
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Namespace Prefix: | agi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of expenditure capitalised during the construction of non-current assets that are not yet available for use. [Refer: Non-current assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2022-03-24 -Paragraph 37 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2022-en-r&anchor=para_37&doctype=Standard -URIDate 2022-03-24 + Details
Name: | ifrs-full_ConstructionInProgress
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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Namespace Prefix: | ifrs-full_
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Balance Type: | na
Period Type: | duration