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Hedging Financial Instruments - Summary of Information Relating to Hedges for Foreign Currency Risk (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2023
TWD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2023
JPY (¥)
Disclosure of detailed information about financial instruments [line items]          
Change in Value Used for Calculating Hedged Ineffectiveness $ 39,900,000 $ 1.3 $ 0 $ (41,400,000)  
Bank loans [member] | Hedges of net investments in foreign operations [member]          
Disclosure of detailed information about financial instruments [line items]          
Contract Amount | ¥         ¥ 124,500
Annual Interest Rate 0.00% 0.00%      
Maturity April 2024 April 2024      
Balance in Other Equity (Continuing Hedges) $ 618.2        
Change in Value Used for Calculating Hedged Ineffectiveness 618.2        
Forward exchange contracts [member] | Cash flow hedges [member]          
Disclosure of detailed information about financial instruments [line items]          
Change in Value Used for Calculating Hedged Ineffectiveness 39,900,000     (41,400,000)  
Forward interest rate contracts [member] | Cash flow hedges [member]          
Disclosure of detailed information about financial instruments [line items]          
Change in Value Used for Calculating Hedged Ineffectiveness     1,379,100,000 132,500,000  
Forecast Transaction Capital Expenditures [member] | Cash flow hedges [member]          
Disclosure of detailed information about financial instruments [line items]          
Change in Value Used for Calculating Hedged Ineffectiveness (39,900,000)     41,400,000  
Forecast Transaction Relates To Issuance of Debts [Member] | Cash flow hedges [member]          
Disclosure of detailed information about financial instruments [line items]          
Change in Value Used for Calculating Hedged Ineffectiveness     $ (1,379,100,000) $ (132,500,000)  
Net investments in foreign operations [member] | Hedges of net investments in foreign operations [member]          
Disclosure of detailed information about financial instruments [line items]          
Change in Value Used for Calculating Hedged Ineffectiveness $ (618.2)