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Financial Risk Management - Net Monetary Position (Details) - Foreign currency risk $ in Thousands, $ in Millions | 12 Months Ended |  |
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Dec. 31, 2020 MXN ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 MXN ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 MXN ($)
Disclosure of nature and extent of risks arising from financial instruments |  |  |  |  |  |
U.S. dollar equivalent monetary assets |  |  | $ 1,125.1 |  | $ 1,253.3 |
U.S. dollar equivalent monetary liabilities |  |  | (5,115.9) |  | (5,231.8) |
Net liability position |  |  | (3,990.8) |  | (3,978.5) |
Euros |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments |  |  |  |  |  |
U.S. dollar equivalent monetary assets |  |  | 24.5 |  | 57.6 |
U.S. dollar equivalent monetary liabilities |  |  | $ (2.0) |  | $ (5.0) |
U.S. dollar |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments |  |  |  |  |  |
Percentage of reasonably possible increase in risk assumption |  |  | 10.00% | 10.00% | 10.00% | 10.00%
Percentage of reasonably possible decrease in risk assumption |  |  | 10.00% | 10.00% | 10.00% | 10.00%
Hypothetical foreign exchange gain | $ 5,705,342 | $ 2,847,471 |  |  |  |
Hypothetical foreign exchange loss | $ 5,705,342 | $ 2,847,471 |  |  |  |
Long-term Debt Designated as Hedging Instrument of the Group's Investment in UHI |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments |  |  |  |  |  |
U.S. dollar equivalent monetary liabilities |  |  | $ (1,130.9) | $ (22,559,983) | $ (2,470.6) | $ (46,653,315)

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