XML 109 R94.htm IDEA: XBRL DOCUMENT v3.8.0.1

Financial Instruments and Risk Management (Available for Sale Financial Assets) (Details) $ in Millions	Dec. 31, 2017 USD ($)
AuRico Metals [Member]
Investment [Line Items]
Financial assets available-for-sale	$ 21.8
Corex Gold Corp [Member]
Investment [Line Items]
Financial assets available-for-sale	3.5
Monarques Gold Corp [Member]
Investment [Line Items]
Financial assets available-for-sale	9.4
Other Investments [Member]
Investment [Line Items]
Financial assets available-for-sale	$ 1.1

X

- Definition

The amount of non-derivative financial assets that are designated as available for sale or are not classified as (a) loans and receivables; (b) held-to-maturity investments; or (c) financial assets at fair value through profit or loss. [Refer: Derivative financial assets; Financial assets at fair value through profit or loss; Held-to-maturity investments]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2018-01-01
-Name IFRS
-Number 7
-IssueDate 2017-01-01
-Paragraph 8
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_8_d&doctype=Standard&book=B
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_FinancialAssetsAvailableforsale
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Line items represent reporting concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 12
-Sentence Column A

+ Details

Name:	invest_InvestmentLineItems
Namespace Prefix:	invest_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_CounterpartiesAxis=agi_AuRicoMetalsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CounterpartiesAxis=agi_CorexGoldCorpMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CounterpartiesAxis=agi_MonarquesGoldCorpMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CounterpartiesAxis=agi_OtherInvestments1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: