The fair value of financial instruments designated as hedging instruments. Hedging instruments are designated derivatives or (for a hedge of the risk of changes in foreign currency exchange rates only) designated non-derivative financial assets or non-derivative financial liabilities whose fair value or cash flows are expected to offset changes in the fair value or cash flows of a designated hedged item. [Refer: At fair value [member]; Derivatives [member]; Derivative financial assets; Derivative financial liabilities; Financial instruments, class [member]; Financial assets; Financial liabilities]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2018-01-01
-Name IFRS
-Number 7
-IssueDate 2017-01-01
-Paragraph 22
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_22_b&doctype=Standard&book=B
-URIDate 2017-03-09

Name:	ifrs-full_FinancialInstrumentsDesignatedAsHedgingInstrumentsAtFairValue
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

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