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Financial instruments (Schedule of Additional Bank Lines of Credit) (Details) - MXN ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Bank loans credit lines: |  |
Drawn balances | $ 350,000 | $ 350,000
Undrawn balances | 182,514 | 116,596
Available line balance | $ 167,486 | $ 233,404

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Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | simecb_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Drawn balances. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Undrawn balances. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant