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Goodwill and Other Intangible Assets | 12 Months Ended
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Sep. 30, 2019
Goodwill and Other Intangible Assets |
Goodwill and Other Intangible Assets | 3. Goodwill and Other Intangible Assets Included on the Company’s Consolidated Balance Sheets at September 30, 2019 and 2018 are the following intangible assets gross carrying amounts and accumulated amortization: ​
​ | ​ | ​ | ​ | ​ | ​
(Dollars in millions) |  | 2019 |  | 2018
Goodwill | ​ | $ | 409.2 |  | 381.7
​ | ​ |  | ​ | ​ |
Intangible assets with determinable lives: | ​ |  | ​ | ​ |
Patents | ​ |  | ​ | ​ |
Gross carrying amount | ​ | $ | 2.1 | ​ | 1.8
Less: accumulated amortization | ​ |  | 0.9 | ​ | 0.8
Net | ​ | $ | 1.2 | ​ | 1.0
​ | ​ |  | ​ | ​ |
Capitalized software | ​ |  | ​ | ​ |
Gross carrying amount | ​ | $ | 79.7 | ​ | 71.3
Less: accumulated amortization | ​ |  | 49.2 | ​ | 41.6
Net | ​ | $ | 30.5 | ​ | 29.7
​ | ​ |  | ​ | ​ |
Customer Relationships | ​ |  | ​ | ​ |
Gross carrying amount | ​ | $ | 241.3 | ​ | 185.3
Less: accumulated amortization | ​ |  | 59.0 | ​ | 47.8
Net | ​ | $ | 182.3 | ​ | 137.5
​ | ​ |  | ​ | ​ |
Other | ​ |  | ​ | ​ |
Gross carrying amount | ​ | $ | 5.3 | ​ | 5.5
Less: accumulated amortization | ​ |  | 2.6 | ​ | 2.0
Net | ​ | $ | 2.7 | ​ | 3.5
Intangible assets with indefinite lives: | ​ |  | ​ | ​ |
Trade names | ​ | $ | 176.3 | ​ | 173.7
​ The Company performed its annual evaluation of goodwill and intangible assets for impairment during the fourth quarter of 2019 and concluded no impairment existed at September 30, 2019 and there are no accumulated impairment losses as of September 30, 2019. The changes in the carrying amount of goodwill attributable to each business segment for 2019 and 2018 are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(Dollars in millions) |  | Filtration |  | Test |  | USG |  | Technical Packaging |  | Total
Balance as of September 30, 2017 | ​ | $ | 73.7 |  | 34.1 |  | 250.2 |  | 19.9 |  | 377.9
Acquisition activity | ​ |  | — |  | — |  | 3.9 |  | — |  | 3.9
Foreign currency translation and other | ​ |  | — |  | — |  | — |  | (0.1) |  | (0.1)
Balance as of September 30, 2018 | ​ | ​ | 73.7 |  | 34.1 |  | 254.1 |  | 19.8 |  | 381.7
Acquisition activity | ​ | ​ | 28.5 | ​ | — | ​ | — | ​ | — | ​ | 28.5
Foreign currency translation and other | ​ | ​ | — | ​ | — | ​ | (0.1) | ​ | (0.9) | ​ | (1.0)
Balance as of September 30, 2019 | ​ | $ | 102.2 | ​ | 34.1 | ​ | 254.0 | ​ | 18.9 | ​ | 409.2
​ Amortization expense related to intangible assets with determinable lives was $19.5 million, $18.3 million and $16.3 million in 2019, 2018 and 2017, respectively. Patents are amortized over the life of the patents, generally 17 years. Capitalized software is amortized over the estimated useful life of the software, generally three to seven years. Customer relationships are generally amortized over fifteen to twenty years. Intangible asset amortization for fiscal years 2020 through 2024 is estimated at approximately $22 million per year.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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