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Hedging Derivative Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2017

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Summary of Hedging Derivative Financial Instruments

		December 31,     2016				December 31,     2017
		NT$				NT$
		(In Millions)				(In Millions)
Financial assets - current
Fair value hedges
Interest rate futures contracts		$	5.6			$	27.0
Cash flow hedges
Forward exchange contracts			—				7.4
		$	5.6			$	34.4
Financial liabilities- current
Cash flow hedges
Forward exchange contracts		$	—			$	15.6

Maturity Period of Outstanding Interest Rate Futures Contracts

The outstanding interest rate futures contracts consisted of the following:

Maturity Period		Contract Amount (US$ in Millions)
December 31, 2016
March 2017		US$	53.6
December 31, 2017
March 2018		US$	169.4

Summary of Outstanding Forward Exchange Contracts

Outstanding forward exchange contracts consisted of the following:

				Contract Amount
		Maturity Date		(In Millions)
December 31, 2017
Sell NT$/Buy EUR		February 2018 to May 2018			NT$2,649.1/EUR75.0

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- Definition

The disclosure of detailed information about hedges.

+ References

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
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-URIDate 2017-03-09

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- Definition

The disclosure of detailed information about hedging instruments. [Refer: Hedging instruments [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2018-01-01
-Name IFRS
-Number 7
-IssueDate 2017-01-01
-Paragraph 24A
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_24A&doctype=Standard
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The disclosure of detailed information about forward contract for which Hedge Accounting Treatment is Applied explanatory.

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