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Hedging Financial Instruments - Summary of hedging financial instruments (Detail) - TWD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financial assets- current |  |
Financial assets current | $ 0.1 | $ 25.9
Financial liabilities- current |  |
Financial liabilities current | 1.2 | 1.8
Fair value hedges [member] | Interest rate futures contracts [member] |  |
Financial assets- current |  |
Financial assets current | 0.1 | 22.4
Financial liabilities- current |  |
Financial liabilities current | $ 1.2 |
Cash flow hedges [member] | Forward exchange contracts [member] |  |
Financial assets- current |  |
Financial assets current |  | 3.5
Financial liabilities- current |  |
Financial liabilities current |  | $ 1.8

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- Definition The amount of current financial assets. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_25&doctype=Standard -URIDate 2020-01-01 + Details
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