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STOCKHOLDERS' EQUITY - Treasury Stock (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Activity in treasury stock |  |  |
Balance at the beginning of the period | $ 3,107.6 |  |
Purchase of shares | 2,900.0 |  |
Balance at the end of the period | $ 3,149.0 | $ 3,107.6 |
Parent Company (Grupo Mexico) common shares |  |  |
Activity in treasury stock |  |  |
Treasury stock balance at the end of the period (in shares) | 111,485,617 | 111,497,617 |
Parent Company (Grupo Mexico) |  |  |
Activity in treasury stock |  |  |
Treasury stock balance at the end of the period (in shares) | 67,793,020 | 74,367,673 |
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 | (0.3) | (0.3) | $ (0.3)
Balance at the end of the period | 2,766.6 | 2,766.9 | 2,767.2
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 | 41.7 | 33.9 | 10.8
Balance at the end of the period | $ 382.4 | $ 340.7 | $ 306.8

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