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Accounting Policies - Translation of Foreign Operations (Details) $ in Thousands, $ in Millions | Dec. 31, 2017 USD ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 MXN ($)
--- | --- | --- | --- | ---
Net investment | UHI |  |  |  |
Detailed information about hedges |  |  |  |
Financial instruments designated as hedging instruments, at fair value | $ 413.3 | $ 8,144,843 | $ 350.7 | $ 7,236,587
Warrants issued by UHI | Fair value hedge of foreign currency |  |  |  |
Detailed information about hedges |  |  |  |
Financial instruments designated as hedging instruments, at fair value | 1,847.0 | 36,395,183 | 180.0 | 3,546,918
Open Ended Fund | Fair value hedge of foreign currency |  |  |  |
Detailed information about hedges |  |  |  |
Financial instruments designated as hedging instruments, at fair value | $ 1,855.9 | $ 38,298,606 | $ 180.0 | $ 3,817,586

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