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Hedging Financial Instruments - Summary of Information Relating to Hedges for Foreign Currency Risk (Detail) - 12 months ended Dec. 31, 2018 € in Millions, $ in Millions, $ in Millions | TWD ($) | USD ($) | EUR (€)
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Disclosure of detailed information about financial instruments [line items] |  |  |
Increase (Decrease) in Value Used for Calculating Hedge Ineffectiveness | $ 41.0 | $ 1.3 |
Cash flow hedges [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Increase (Decrease) in Value Used for Calculating Hedge Ineffectiveness | 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 | (41.0) |  |
Cash flow hedges [member] | Forward exchange contracts [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Contract Amount | 3,917.7 |  | € 112.0
Balance in Other Equity (Continuing Hedges) | 23.6 |  |
Increase (Decrease) in Value Used for Calculating Hedge Ineffectiveness | 34.6 |  |
Cash flow hedges [member] | Foreign Exchange Contracts [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Increase (Decrease) in Value Used for Calculating Hedge Ineffectiveness | $ 6.4 |  |
Bottom of range [member] | Cash flow hedges [member] | Forward exchange contracts [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Maturity | 2019-02 | 2019-02 |
Top of range [member] | Cash flow hedges [member] | Forward exchange contracts [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Maturity | 2019-04 | 2019-04 |

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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 2018-01-01 -Paragraph 24C -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_24C_a_i&doctype=Standard -URIDate 2018-03-16 + Details
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