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Other Assets - Summary of Other Assets (Detail) $ in Millions, $ in Millions | Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($)
--- | --- | --- | ---
Assets [abstract] |  |  |
Tax receivable | $ 4,021.6 |  | $ 2,325.8
Prepaid expenses | 1,559.9 |  | 1,007.0
Others | 1,624.0 |  | 1,553.0
Other assets, total | 7,205.5 |  | 4,885.8
Current portion | 4,222.4 | $ 142.5 | 3,385.4
Noncurrent portion | 2,983.1 | $ 100.6 | 1,500.4
Other assets, total | $ 7,205.5 |  | $ 4,885.8

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