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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Sep. 30, 2019
Goodwill and Other Intangible Assets |
Schedule of goodwill and 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
Schedule of carrying amount of goodwill attributable to each business segment | 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

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