XML 101 R84.htm IDEA: XBRL DOCUMENT v3.19.1

Financial assets and other receivables - Government Grants (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Other financial assets
Income from government grants	$ 26,369	$ 15,716
Expense related to government grants	18,923	9,234
Net income (loss) related to government grants	7,446	$ 6,482
Carrying amount of factored receivables and the secured borrowings	$ 6,913

X

- Definition

The carrying amount of factored receivables and the secured borrowings.

+ References

No definition available.

+ Details

Name:	gsm_CurrentFactoredReceivableAndSecuredBorrowings
Namespace Prefix:	gsm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of expenses in relation to government grants.

+ References

No definition available.

+ Details

Name:	gsm_ExpensesFromGovernmentGrants
Namespace Prefix:	gsm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of net income (expenses) recognised in relation to government grants.

+ References

No definition available.

+ Details

Name:	gsm_RevenueExpensesFromGovernmentGrants
Namespace Prefix:	gsm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

The amount of income recognised in relation to government grants. [Refer: Government grants]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 20
-IssueDate 2018-01-01
-Paragraph 39
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=20&date=2018-03-01&anchor=para_39_b&doctype=Standard
-URIDate 2018-03-16

+ Details

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