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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%

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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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- 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 + Details
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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 + 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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