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Finance Costs - Summary of Finance Costs (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Material income and expense [abstract]        
Interest expense, Bank loans $ 500.9   $ 1,869.4 $ 1,417.3
Interest expense, Corporate bonds 1,337.3   1,139.9 1,633.8
Lease liabilities 227.8   240.9  
Interest expense, Others 15.5   0.7 0.1
Finance costs $ 2,081.5 $ 74.1 $ 3,250.9 $ 3,051.2