XML 115 R81.htm IDEA: XBRL DOCUMENT v3.24.1

Financial Instruments and Risk Management (Currency Contracts) (Details) - Dec. 31, 2023 - 2024 - Currency risk $ in Millions, $ in Millions	CAD ($)	$ / $	MXN ($)	$ / $
Collars
Disclosure of detailed information about hedged items [line items]
Notional amount	$ 504.0		$ 330.0
Collars | Bottom of range
Disclosure of detailed information about hedged items [line items]
Average rate of hedging instrument		133.00%		1814.00%
Collars | Top of range
Disclosure of detailed information about hedged items [line items]
Average rate of hedging instrument		139.00%		2053.00%
Forward contract
Disclosure of detailed information about hedged items [line items]
Notional amount | $			$ 125.0
Forward contract | Bottom of range
Disclosure of detailed information about hedged items [line items]
Average rate of hedging instrument				1777.00%
Forward contract | Top of range
Disclosure of detailed information about hedged items [line items]
Average rate of hedging instrument				1777.00%

X

- Definition

The average rate of a hedging instrument. [Refer: Hedging instruments [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2023-01-01
-Paragraph 23B
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_23B_b&doctype=Standard
-URIDate 2023-03-23

+ Details

Name:	ifrs-full_AverageRateOfHedgingInstrument
Namespace Prefix:	ifrs-full_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

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_DisclosureOfDetailedInformationAboutHedgedItemsLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The nominal or face amount of a financial instrument, used to calculate payments made on that instrument.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2023-01-01
-Paragraph 112
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2023-03-23

+ Details

Name:	ifrs-full_NotionalAmount
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	ifrs-full_HedgingInstrumentsAxis=agi_CollarsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_MaturityAxis=ifrs-full_NotLaterThanOneYearMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_TypesOfRisksAxis=ifrs-full_CurrencyRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_HedgingInstrumentsAxis=ifrs-full_ForwardContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: