XML 120 R86.htm IDEA: XBRL DOCUMENT
v3.22.1

Financial Instruments and Risk Management (Interest Rate Risk) (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($)
Interest rate risk [member] |
Disclosure of nature and extent of risks arising from financial instruments [line items] |
Impact on interest earned | $ 1.8

X
- Definition Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Change In Risk Variable, Impact On Interest Income + References No definition available. + Details
Name: | agi_SensitivityAnalysisForTypesOfMarketRiskReasonablyPossibleChangeInRiskVariableImpactOnInterestIncome
Namespace Prefix: | agi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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
Name: | ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_TypesOfRisksAxis=ifrs-full_InterestRateRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |