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Goodwill and Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in the carrying amount of goodwill by segment | The changes in the carrying amount of goodwill were as follows:
(dollars in millions) | Electronics |  | Industrial & Specialty |  | Total
Balance at December 31, 2020 | $ | 1,274.0 |  |  | $ | 978.7 |  | (1) | $ | 2,252.7 |
Foreign currency translation | (12.7) |  |  | (15.0) |  |  | (27.7) |
Balance at March 31, 2021 | $ | 1,261.3 |  |  | $ | 963.7 |  |  | $ | 2,225.0 |
(1) Includes accumulated impairment losses of $46.6 million.
Schedule of finite-lived intangible assets subject to amortization | Intangible assets subject to amortization were as follows:
| March 31, 2021 |  | December 31, 2020
(dollars in millions) | Gross Carrying Amount |  | Accumulated Amortization |  | Net Book Value |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Book Value
Customer relationships | $ | 972.4 |  |  | $ | (448.4) |  |  | $ | 524.0 |  |  | $ | 984.3 |  |  | $ | (435.4) |  |  | $ | 548.9 |
Developed technology | 362.7 |  |  | (215.4) |  |  | 147.3 |  |  | 400.0 |  |  | (241.5) |  |  | 158.5 |
Tradenames | 90.3 |  |  | (12.2) |  |  | 78.1 |  |  | 91.8 |  |  | (11.3) |  |  | 80.5 |
Other | — |  |  | — |  |  | — |  |  | 1.7 |  |  | (1.7) |  |  | — |
Total | $ | 1,425.4 |  |  | $ | (676.0) |  |  | $ | 749.4 |  |  | $ | 1,477.8 |  |  | $ | (689.9) |  |  | $ | 787.9 |

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