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Goodwill and Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2020
Goodwill and Intangible Assets |
Schedule of changes in the carrying amount of goodwill | The following table sets forth the changes in the carrying amount of goodwill for the three months ended March 31, 2020 (dollars in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | BSI Life | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Science | ​ | BSI NANO | ​ | BEST | ​ | Total
Balance at December 31, 2019 |  | $ | 84.2 | ​ | $ | 208.5 | ​ | $ | 0.3 | ​ | $ | 293.0
Foreign currency impact | ​ | ​ | (0.3) | ​ | ​ | (2.7) | ​ | ​ | — | ​ | ​ | (3.0)
Balance at March 31, 2020 | ​ | $ | 83.9 | ​ | $ | 205.8 | ​ | $ | 0.3 | ​ | $ | 290.0
Summary of intangible assets | The following is a summary of intangible assets, excluding goodwill (dollars in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2020 | ​ | December 31, 2019
​ | ​ | Gross | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Gross | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Carrying | ​ | Accumulated | ​ | Net Carrying | ​ | Carrying | ​ | Accumulated | ​ | Net Carrying
​ |  | Amount |  | Amortization |  | Amount |  | Amount |  | Amortization |  | Amount
Existing technology and related patents | ​ | $ | 298.4 | ​ | $ | (186.7) | ​ | $ | 111.7 | ​ | $ | 300.9 | ​ | $ | (182.4) | ​ | $ | 118.5
Customer relationships | ​ |  | 132.9 | ​ |  | (33.8) | ​ |  | 99.1 | ​ |  | 134.7 | ​ |  | (30.9) | ​ |  | 103.8
Non compete contracts | ​ |  | 1.8 | ​ |  | (1.8) | ​ |  | — | ​ | ​ | 1.8 | ​ | ​ | (1.8) | ​ | ​ | —
Trade names | ​ |  | 13.5 | ​ |  | (3.2) | ​ |  | 10.3 | ​ |  | 13.7 | ​ |  | (2.9) | ​ |  | 10.8
Other | ​ | ​ | 5.5 | ​ | ​ | (5.4) | ​ | ​ | 0.1 | ​ | ​ | 5.5 | ​ | ​ | (5.4) | ​ | ​ | 0.1
Intangible assets | ​ | $ | 452.1 | ​ | $ | (230.9) | ​ | $ | 221.2 | ​ | $ | 456.6 | ​ | $ | (223.4) | ​ | $ | 233.2

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