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Hedging Derivative Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2017
Text block1 [abstract] |
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 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_22&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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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 -URIDate 2017-03-09 + Details
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- Definition The disclosure of detailed information about forward contract for which Hedge Accounting Treatment is Applied explanatory. + References No definition available. + Details
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