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Other Intangible Assets | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Other Intangible Assets | Note 9. Other Intangible Assets Other intangible assets comprise the following:
(in millions) |  | 2020 |  |  | 2019
Gross cost at January 1 |  | $ | 294.8 |  |  | $ | 294.6 |
Additions |  |  | 0.0 |  |  |  | 1.1 |
Exchange effect |  |  | 4.1 |  |  |  | (0.9 | )
Gross cost at December 31 |  |  | 298.9 |  |  |  | 294.8 |
Accumulated amortization at January 1 |  |  | (181.3 | ) |  |  | (158.3 | )
Amortization expense |  |  | (20.9 | ) |  |  | (23.0 | )
Impairment |  |  | (19.8 | ) |  |  | 0.0 |
Exchange effect |  |  | (1.6 | ) |  |  | 0.0 |
Accumulated amortization at December 31 |  |  | (223.6 | ) |  |  | (181.3 | )
Net book amount at December 31 |  | $ | 75.3 |  |  | $ | 113.5 |
Amortization expense The amortization expense was $20.9 million, $23.0 million and $26.3 million in 2020, 2019 and 2018, respectively. Excluding the impact of foreign exchange translation on the balance sheet, $2.9 million, $3.4 million and $3.4 million of amortization, respectively, was recognized in cost of goods sold, and the remainder was recognized in selling, general and administrative expenses. During the quarter ended June 30, 2020, the Company performed an impairment review over the assets of each operating segment. This indicated the fair values substantially exceeded the carrying values for all operating segments. Further, the Company also performed an impairment review over each of the businesses within the Oilfield Services segment, as a result of reduction in demand for drilling related products. A discounted cash flow analysis was performed to determine the fair value of the assets. This indicated that the intangible assets arising from the acquisition of Strata Control Services Inc. were impaired. The impaired assets relate to technology ($10.0 million) and customer relationships ($9.8 million). There was no impairment indicated on the other businesses within the Oilfield Services operating segment. The net book amount by category of other intangible assets is shown in the following table:
(in millions) |  | December 31 2020 |  |  | December 31 2019 |
Product rights |  | $ | 6.3 |  |  | $ | 10.1 |
Brand names |  |  | 2.3 |  |  |  | 2.9 |
Technology |  |  | 19.8 |  |  |  | 32.6 |
Customer relationships |  |  | 44.2 |  |  |  | 60.8 |
Internally developed software |  |  | 2.7 |  |  |  | 7.1 |
|  | $ | 75.3 |  |  | $ | 113.5 |
Future amortization expense is estimated to be as follows for the next five years:
(in millions) |  |  |
2021 |  | $ | 15.9 |
2022 |  | $ | 14.3 |
2023 |  | $ | 10.9 |
2024 |  | $ | 10.2 |
2025 |  | $ | 7.2 |

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- Definition The entire disclosure for all or part of the information related to 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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