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Financial information by segments (Narrative) (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Canada [Member]
Disclosure of geographical areas [line items]
Percentage of sales	3.00%	4.00%

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

Percentage of sales.

+ References

No definition available.

+ Details

Name:	simecb_PercentageOfSales
Namespace Prefix:	simecb_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_GeographicalAreasAxis=country_CA
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: