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Accounting Policies - Translation of Foreign Operations (Details) $ in Thousands, $ in Millions | Dec. 31, 2020 USD ($) | Dec. 31, 2020 MXN ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 MXN ($)
--- | --- | --- | --- | ---
Net investment | UHI |  |  |  |
Detailed information about hedges |  |  |  |
Financial instruments designated as hedging instruments, at fair value | $ 1,074.0 | $ 21,424,180 | $ 433.7 | $ 8,189,662
Fair value hedge of foreign currency | UHI |  |  |  |
Detailed information about hedges |  |  |  |
Financial instruments designated as hedging instruments, at fair value | 871.6 | 17,387,699 | 1,788.6 | 33,775,451
Open Ended Fund | Fair value hedge of foreign currency |  |  |  |
Detailed information about hedges |  |  |  |
Financial instruments designated as hedging instruments, at fair value | $ 56.9 | $ 1,135,803 | $ 248.3 | $ 4,688,202

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