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Goodwill and Intangible Assets | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets | Goodwill and Intangible Assets The changes in the carrying amount of goodwill by reportable segment were as follows:
($ in millions) | Proprietary Products |  | Contract-Manufactured Products |  | Total
Balance, December 31, 2018 | $ | 76.0 |  |  | $ | 29.8 |  |  | $ | 105.8 |
Goodwill recorded due to acquisition | 2.6 |  |  | — |  |  | 2.6 |
Foreign currency translation | (0.5) |  |  | (0.1) |  |  | (0.6) |
Balance, December 31, 2019 | 78.1 |  |  | 29.7 |  |  | 107.8 |
Foreign currency translation | 2.8 |  |  | 0.5 |  |  | 3.3 |
Balance, December 31, 2020 | $ | 80.9 |  |  | $ | 30.2 |  |  | $ | 111.1 |
In April 2019, we acquired the business of our distributor in South Korea. As a result of the acquisition, we recorded goodwill of $2.6 million. The goodwill was recorded within our Proprietary Products reportable segment. As of December 31, 2020, we had no accumulated goodwill impairment losses. Intangible assets and accumulated amortization as of December 31 were as follows:
| 2020 |  | 2019
($ in millions) | Cost |  | Accumulated Amortization |  | Net |  | Cost |  | Accumulated Amortization |  | Net
Patents and licensing | $ | 25.9 |  |  | $ | (17.9) |  |  | $ | 8.0 |  |  | $ | 21.5 |  |  | $ | (16.0) |  |  | $ | 5.5 |
Technology | 3.3 |  |  | (1.7) |  |  | 1.6 |  |  | 3.3 |  |  | (1.5) |  |  | 1.8 |
Trademarks | 2.0 |  |  | (1.8) |  |  | 0.2 |  |  | 2.0 |  |  | (1.8) |  |  | 0.2 |
Customer relationships | 40.9 |  |  | (23.4) |  |  | 17.5 |  |  | 40.3 |  |  | (21.6) |  |  | 18.7 |
Customer contracts | 11.1 |  |  | (7.9) |  |  | 3.2 |  |  | 11.0 |  |  | (7.4) |  |  | 3.6 |
| $ | 83.2 |  |  | $ | (52.7) |  |  | $ | 30.5 |  |  | $ | 78.1 |  |  | $ | (48.3) |  |  | $ | 29.8 |
As a result of the acquisition of our South Korean distributor in April 2019, we recorded a customer relationships intangible asset of $11.2 million, which is being amortized over ten years. The cost basis of intangible assets includes a foreign currency translation gain of $1.3 million and a foreign currency translation loss of $0.3 million for the years ended December 31, 2020 and 2019, respectively. Amortization expense for the years ended December 31, 2020, 2019 and 2018 was $4.4 million, $3.4 million and $2.7 million, respectively. Estimated annual amortization expense for the next five years is as follows: 2021 - $3.8 million, 2022 - $3.8 million, 2023 - $3.7 million, 2024 - $3.6 million and 2025 - $3.4 million.

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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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