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Significant Operating Lease Arrangements (Tables) | 12 Months Ended
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Dec. 31, 2017
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Minimum Lease Payments Expensed | The Company expensed the lease payments as follows:
|  |  |  | Years Ended December 31 |
|  |  |  | 2015 |  |  | 2016 |  |  | 2017 |
|  |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  |  |  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |
Minimum lease payments |  |  |  | $ | 996.0 |  |  | $ | 1,135.7 |  |  | $ | 2,178.1 |
Future Minimum Lease Payments under Non-cancellable Operating Leases | Future minimum lease payments under the above non-cancellable operating leases are as follows:
|  | December 31, 2016 |  |  | December 31, 2017 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |
Not later than 1 year |  | $ | 1,321.5 |  |  | $ | 3,116.2 |
Later than 1 year and not later than 5 years |  |  | 3,677.4 |  |  |  | 5,174.7 |
Later than 5 years |  |  | 6,624.0 |  |  |  | 8,905.9 |
|  | $ | 11,622.9 |  |  | $ | 17,196.8 |

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- Definition The disclosure of finance leases and operating leases by the lessee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2019-01-01 -Name IAS -Number 17 -IssueDate 2017-01-01 -Paragraph 31 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2017-03-02&anchor=para_31&doctype=Standard&book=B -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2019-01-01 -Name IAS -Number 17 -IssueDate 2017-01-01 -Paragraph 35 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2017-03-02&anchor=para_35&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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- Definition The disclosure of a maturity analysis of operating lease payments. Operating lease is a lease that does not transfer substantially all the risks and rewards incidental to ownership of an underlying asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2019-01-01 -Name IFRS -Number 16 -IssueDate 2017-01-01 -Paragraph 97 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=16&date=2017-03-01&anchor=para_97&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Text block1 [abstract] + References No definition available. + Details
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