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Finance Costs - Summary of Finance Costs (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Material income and expense [abstract]        
Interest expense, Bank loans $ 1,869.4   $ 1,417.3 $ 766.6
Interest expense, Corporate bonds 1,139.9   1,633.8 2,563.6
Lease liabilities 240.9      
Interest expense, Others 0.7   0.1 0.1
Finance costs $ 3,250.9 $ 108.7 $ 3,051.2 $ 3,330.3