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STOCKHOLDERS' EQUITY: - Treasury Stock (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Activity in treasury stock |  |  |  |  |
Balance at the beginning of the period |  |  | $ 3,074.0 |  |
Balance at the end of the period | $ 3,096.3 | $ 3,080.8 | $ 3,096.3 | $ 3,080.8 |
Parent Company (Grupo Mexico) common shares |  |  |  |  |
Activity in treasury stock |  |  |  |  |
Treasury stock balance at the end of the period (in shares) | 111,500,417 |  | 111,500,417 |  | 111,509,217
TREASURY STOCK: | Parent Company (Grupo Mexico) common shares |  |  |  |  |
Activity in treasury stock |  |  |  |  |
Balance at the beginning of the period |  |  | $ 2,767.2 | 2,767.5 |
Used for corporate purposes | $ (0.1) |  | (0.2) | (0.1) |
Balance at the end of the period | 2,767.0 | 2,767.4 | 2,767.0 | 2,767.4 |
TREASURY STOCK: | Parent Company (Grupo Mexico) |  |  |  |  |
Activity in treasury stock |  |  |  |  |
Balance at the beginning of the period |  |  | 306.8 | 296.0 |
Other activity, including dividend, interest and foreign currency transaction effect | 4.9 | 5.0 | 22.5 | 17.4 |
Balance at the end of the period | $ 329.3 | $ 313.4 | $ 329.3 | $ 313.4 |
Treasury stock balance at the end of the period (in shares) | 75,332,743 |  | 75,332,743 |  | 79,800,655

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- Definition Value of treasury shares or units reissued. Excludes reissuance of shares or units in treasury for award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI https://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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