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BENEFIT PLANS: - Post retirement (Details) - Post retirement defined benefit plans and defined contribution plan - Mexican Health Plan $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) entity	Dec. 31, 2019
Assumptions used to determine the pension obligation and other post-retirement benefits and cost
Number of financial institutions managing plan assets | entity	3
Plan obligations as a percentage of benefit obligation	100.00%
Asset allocation (as a percent)	100.00%	100.00%
Expected employer contribution in next fiscal year | $	$ 2.3
Parent Company (Grupo Mexico) common shares
Assumptions used to determine the pension obligation and other post-retirement benefits and cost
Asset allocation (as a percent)	22.00%
Treasury bills
Assumptions used to determine the pension obligation and other post-retirement benefits and cost
Asset allocation (as a percent)	78.00%	80.00%
Equity securities
Assumptions used to determine the pension obligation and other post-retirement benefits and cost
Asset allocation (as a percent)	22.00%	20.00%

X

- Definition

Represents the number of financial institutions managing the plan assets.

+ References

No definition available.

+ Details

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- Definition

Represents the plan obligation as a percentage of the entity's aggregate defined benefit obligation.

+ References

No definition available.

+ Details

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- References

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- Definition

Amount of contribution expected to be received by defined benefit plan from employer in next fiscal year following current fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921

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- Definition

Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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- Details

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- Details

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- Details

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- Details

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- Details

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