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3. Intangible Assets, Goodwill and Other (Tables) | 6 Months Ended
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Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes to goodwill by segment | Goodwill by segment are as follows (in millions):
| Life Science |  | Clinical Diagnostics |  | Total
Balances as of June 30, 2021 and December 31, 2020: |  |  |  |  |
Goodwill | $ | 277.9 |  |  | $ | 349.2 |  |  | $ | 627.1 |
Accumulated impairment losses | (41.8) |  |  | (293.4) |  |  | (335.2) |
Goodwill, net | $ | 236.1 |  |  | $ | 55.8 |  |  | $ | 291.9 |
Schedule of identifiable purchased intangible assets with definite lives | Information regarding our identifiable purchased intangible assets with definite and indefinite lives is as follows (in millions):
| June 30, 2021
| Weighted-Average Remaining Amortization Period (years) |  | Purchase Price |  | Accumulated Amortization |  | Net Carrying Amount
Customer relationships/lists | 5.38 |  | $ | 114.0 |  |  | $ | (89.1) |  |  | $ | 24.9 |
Know how | 4.25 |  | 193.7 |  |  | (174.7) |  |  | 19.0 |
Developed product technology | 13.68 |  | 217.6 |  |  | (111.8) |  |  | 105.8 |
Licenses | 7.26 |  | 65.3 |  |  | (39.0) |  |  | 26.3 |
Tradenames | 7.58 |  | 6.4 |  |  | (4.3) |  |  | 2.1 |
Covenants not to compete | 3.47 |  | 4.6 |  |  | (2.4) |  |  | 2.2 |
Other | — |  | 0.1 |  |  | (0.1) |  |  | — |
Total definite-lived intangible assets |  |  | 601.7 |  |  | (421.4) |  |  | 180.3 |
In-process research and development |  |  | 4.6 |  |  | — |  |  | 4.6 |
Total purchased intangible assets |  |  | $ | 606.3 |  |  | $ | (421.4) |  |  | $ | 184.9 |
| December 31, 2020
| Weighted-Average Remaining Amortization Period (years) |  | Purchase Price |  | Accumulated Amortization |  | Net Carrying Amount
Customer relationships/lists | 5.51 |  | $ | 116.6 |  |  | $ | (87.2) |  |  | $ | 29.4 |
Know how | 4.75 |  | 196.6 |  |  | (175.4) |  |  | 21.2 |
Developed product technology | 14.00 |  | 218.1 |  |  | (107.1) |  |  | 111.0 |
Licenses | 7.73 |  | 65.6 |  |  | (37.4) |  |  | 28.2 |
Tradenames | 7.82 |  | 6.6 |  |  | (4.2) |  |  | 2.4 |
Covenants not to compete | 3.87 |  | 4.5 |  |  | (2.0) |  |  | 2.5 |
Other | — |  | 0.1 |  |  | (0.1) |  |  | — |
Total definite-lived intangible assets |  |  | 608.1 |  |  | (413.4) |  |  | 194.7 |
In-process research and development |  |  | 4.8 |  |  | — |  |  | 4.8 |
Total purchased intangible assets |  |  | $ | 612.9 |  |  | $ | (413.4) |  |  | $ | 199.5 |
Finite-lived Intangible Assets Amortization Expense [Table Text Block] | Amortization expense related to purchased intangible assets is as follows (in millions):
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Amortization expense | $ | 7.2 |  |  | $ | 7.2 |  |  | $ | 14.4 |  |  | $ | 13.1 |

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- Definition Tabular disclosure of the characteristics, including initial carrying value, residual amount, weighted average useful life, of finite-lived intangible assets acquired during the period by major class. A major class is composed of intangible assets that can be grouped together because they are similar, either by nature or by their use in the operations of the company. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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