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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, 2017 MXN ($) | Dec. 31, 2016 MXN ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 MXN ($)
Disclosure of nature and extent of risks arising from financial instruments |  |  |  |  |  |
U.S. dollar equivalent assets |  |  | $ 1,485.2 |  | $ 1,899.1 |
U.S. dollar equivalent liabilities |  |  | (4,411.5) |  | (5,087.6) |
Net liability position |  |  | (2,926.3) |  | (3,188.5) |
Euros |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments |  |  |  |  |  |
U.S. dollar equivalent assets |  |  | 31.8 |  | 16.4 |
U.S. dollar equivalent liabilities |  |  | $ 5.9 |  | $ 7.7 |
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 | $ 957,507 | $ 1,654,620 |  |  |  |
Hypothetical foreign exchange loss | $ 957,507 | $ 1,654,620 |  |  |  |
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 liabilities |  |  | $ 2,440.3 | $ 48,086,944 | $ 2,386.6 | $ 49,249,604

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