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STOCKHOLDERS' EQUITY: - Treasury Stock (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Activity in treasury stock |  |  |  |  |
Balance at the beginning of the period |  |  | $ 3,107.6 |  |
Balance at the end of the period | $ 3,131.1 | $ 3,096.3 | $ 3,131.1 | $ 3,096.3 |
Parent Company (Grupo Mexico) common shares |  |  |  |  |
Activity in treasury stock |  |  |  |  |
Treasury stock balance at the end of the period (in shares) | 111,488,017 |  | 111,488,017 |  | 111,497,617
TREASURY STOCK: | Parent Company (Grupo Mexico) common shares |  |  |  |  |
Activity in treasury stock |  |  |  |  |
Balance at the beginning of the period |  |  | $ 2,766.9 | 2,767.2 |
Used for corporate purposes | $ (0.1) | (0.1) | (0.2) | (0.2) |
Balance at the end of the period | 2,766.7 | 2,767.0 | 2,766.7 | 2,767.0 |
TREASURY STOCK: | Parent Company (Grupo Mexico) |  |  |  |  |
Activity in treasury stock |  |  |  |  |
Balance at the beginning of the period |  |  | 340.7 | 306.8 |
Other activity, including dividend, interest and foreign currency transaction effect | (0.6) | 4.9 | 23.7 | 22.5 |
Balance at the end of the period | $ 364.4 | $ 329.3 | $ 364.4 | $ 329.3 |

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