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Lease Arrangements - Other lease information (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
TWD ($)
Presentation of leases for lessee [abstract]  
Expenses relating to short-term leases $ 5,007.1
Expenses relating to low-value asset leases 0.5
Expenses relating to variable lease payments not included in the measurement of lease liabilities 195.1
Total cash outflow for leases $ 7,724.4