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Share Capital (Antidilutive Securities) (Details) shares in Thousands	12 Months Ended
	Dec. 31, 2023 shares
Employee Stock Option1
Earnings per share [line items]
Antidilutive securities	4

X

- Definition

Antidilutive Securities Excluded From Computation Of Earnings Per Share, Amount1

+ References

No definition available.

+ Details

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Namespace Prefix:	agi_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

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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_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	agi_AntidilutiveSecuritiesAxis=agi_EmployeeStockOption1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: