XML 64 R70.htm IDEA: XBRL DOCUMENT v3.20.1

Share Capital (Share Purchase Warrants) (Details) $ in Millions	Jan. 07, 2019 USD ($) shares
Disclosure of classes of share capital [line items]
Warrants expired | shares	5,215,000
Gains on derivatives | $	$ 3.9

X

- Definition

Class of Warrant or Right, Expired

+ References

No definition available.

+ Details

Name:	agi_ClassofWarrantorRightExpired
Namespace Prefix:	agi_
Data Type:	xbrli:sharesItemType
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 domain 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

- Definition

The gains (losses) resulting from change in the fair value of derivatives recognised in profit or loss. [Refer: Derivatives [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 85
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_85&doctype=Standard
-URIDate 2019-03-27

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration