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Investments in Financial Instruments - Additional Information (Details) $ in Thousands, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2021 USD ($) | Mar. 31, 2021 MXN ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 MXN ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2020 MXN ($) | Nov. 30, 2019 USD ($) | Nov. 30, 2019 MXN ($) | Jul. 31, 2019 USD ($) | Jul. 31, 2019 MXN ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2020 MXN ($) | Jun. 30, 2021 MXN ($) | Dec. 31, 2020 MXN ($) | Dec. 31, 2019 MXN ($)
Financial Instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Decline in estimated fair value of the Group's investment accounted for in other comprehensive income or loss, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,259,764 | $ (180,114)
Impairment loss on Group's investment in shares of UHI II |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,455,356 |
Fair value amount of Open ended fund | $ 10.0 | $ 258,956 | $ 153.7 | $ 3,155,643 | $ 153.7 | $ 3,155,643 | $ 121.6 | $ 2,301,682 | $ 121.6 | $ 2,301,682 |  |  |  |  |
Cash proceeds from disposition in the aggregate amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,755,415 |  |
UH II |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial Instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment loss on Group's investment in shares of UHI II |  |  |  |  |  |  |  |  |  |  | $ 228.6 | $ 5,455,356 |  | 5,455,356 |
Warrants issued by UHI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial Instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Decline in estimated fair value of the Group's investment accounted for in other comprehensive income or loss, net of tax |  |  |  |  |  |  |  |  |  |  |  | $ 21,937,152 |  |  |
Tax amount on decline in estimated fair value of the Group's investment accounted for in other comprehensive income or loss |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,581,146 |

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