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Identifiable Intangible Assets | 12 Months Ended
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Sep. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract] |
Identifiable Intangible Assets | Intangible Assets Direct internal and external costs to develop external-use software are capitalized. Capitalized costs are depreciated over the estimated useful life of the software, beginning when the software is complete and ready for sale. During 2014, we revised our estimate of the useful life of the software to 6 years from 3 years. At September 30, 2015, the remaining weighted-average amortization period for the external-use software was 4.0 years. Amortization expense related to such software assets was $1.6 million, $1.1 million and $2.3 million for 2015, 2014 and 2013, respectively. Amortization expense for each of the next five years is scheduled to be $2.3 million in 2016, $2.3 million in 2017, $2.1 million in 2018, $1.8 million in 2019 and $1.6 million in 2020. At September 30, 2015, the remaining weighted-average amortization period for the business combination-related finite-lived intangible assets was 8.1 years. Amortization expense related to these assets was $27.8 million, $28.3 million and $29.5 million for 2015, 2014 and 2013, respectively. Amortization expense for each of the next five years is scheduled to be $22.3 million in 2016, $22.4 million in 2017, $22.5 million in 2018, $22.3 million in 2019 and $22.2 million in 2020. Intangible assets are presented below.
| September 30,
| 2015 |  | 2014
| (in millions)
Capitalized external-use software: |  |  |
Cost | $ | 17.9 |  |  | $ | 14.3 |
Accumulated amortization | (7.0 | ) |  | (5.4 | )
Net book value | 10.9 |  |  | 8.9 |
Business combination-related: |  |  |
Cost: |  |  |
Finite-lived intangible assets: |  |  |
Technology | 80.3 |  |  | 80.4 |
Customer relationships and other | 400.2 |  |  | 400.2 |
Indefinite-lived intangible assets: |  |  |
Trade names and trademarks | 299.6 |  |  | 300.0 |
Goodwill | 5.4 |  |  | 5.4 |
| 785.5 |  |  | 786.0 |
Accumulated amortization: |  |  |
Technology | (74.2 | ) |  | (68.1 | )
Customer relationships and other | (214.9 | ) |  | (193.2 | )
| (289.1 | ) |  | (261.3 | )
Net book value | 496.4 |  |  | 524.7 |
Total intangible assets net book value | $ | 507.3 |  |  | $ | 533.6 |

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275 + Details
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