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Hedging Financial Instruments - Summary of Information Relating to Hedges for Foreign Currency Risk (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2020 TWD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 TWD ($) | Dec. 31, 2018 TWD ($)
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Increase (Decrease) in Value Used for Calculating Hedge Ineffectiveness | $ 24.1 | $ 0.9 | $ (109.6) | $ 41.0
Cash flow hedges [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Increase (Decrease) in Value Used for Calculating Hedge Ineffectiveness | 24.1 |  | (109.6) | 41.0
Cash flow hedges [member] | Forecast Transaction Capital Expenditures [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Increase (Decrease) in Value Used for Calculating Hedge Ineffectiveness | (24.1) |  | 109.6 | (41.0)
Cash flow hedges [member] | Forward exchange contracts [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Contract Amount |  |  | $ 1,342.4 |
Maturity |  |  | January 2020 |
Balance in Other Equity (Continuing Hedges) |  |  | $ (3.8) |
Increase (Decrease) in Value Used for Calculating Hedge Ineffectiveness | $ 24.1 |  | $ (109.6) | 34.6
Cash flow hedges [member] | Foreign currency deposits [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Increase (Decrease) in Value Used for Calculating Hedge Ineffectiveness |  |  |  | $ 6.4

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- Definition The gain (loss) recognised in other comprehensive income on hedge ineffectiveness. [Refer: Gain (loss) on hedge ineffectiveness] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 24C -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_24C_a_i&doctype=Standard -URIDate 2020-01-01 + Details
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