XML 74 R43.htm IDEA: XBRL DOCUMENT v3.23.1

Management of Capital (Tables)

12 Months Ended

Dec. 31, 2022

Disclosure of objectives, policies and processes for managing capital [abstract]

Schedule of Managed Capital

			December 31, 2022			December 31, 2021
Shareholder's equity			$2,721.1			$2,735.6

X

- Definition

Schedule of Managed Capital [Table Text Block]

+ References

No definition available.

+ Details

Name:	agi_ScheduleofManagedCapitalTableTextBlock
Namespace Prefix:	agi_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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