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Lease Arrangements - Other lease information (Details) - TWD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Presentation of leases for lessee [abstract]    
Expenses relating to short-term leases $ 2,588.9 $ 1,754.8
Expenses relating to variable lease payments not included in the measurement of lease liabilities 101.0 97.2
Total cash outflow for leases $ 3,660.1 $ 3,568.8