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STOCKHOLDERS' EQUITY - Treasury Stock (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 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 | $ 3,087.7 | $ 3,061.2 |
Parent Company (Grupo Mexico) common shares |  |  |
Activity in treasury stock |  |  |
Treasury stock balance at the end of the period (in shares) | 111,506,017 |  | 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) |  |
Balance at the end of the period | 2,767.1 | 2,767.5 |
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 | 13.8 | (2.3) |
Other activity, including dividend, interest and foreign currency transaction effect | 13.8 | (2.3) |
Balance at the end of the period | $ 320.6 | $ 293.7 |
Treasury stock balance at the end of the period (in shares) | 79,728,356 |  | 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 http://asc.fasb.org/extlink&oid=123467817&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 http://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 http://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 http://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 http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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