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3. Intangible Assets, Goodwill and Other (Tables) | 3 Months Ended
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Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes to goodwill by segment | Changes to goodwill by segment were as follows (in millions):
| Life Science |  | Clinical Diagnostics |  | Total
Balances as of January 1, 2018: |  |  |  |  |
Goodwill | $ | 234.7 |  |  | $ | 324.6 |  |  | $ | 559.3 |
Accumulated impairment losses | (35.9 | ) |  | (17.3 | ) |  | (53.2 | )
Goodwill, net | 198.8 |  |  | 307.3 |  |  | 506.1 |
Divestiture | — |  |  | (1.4 | ) |  | (1.4 | )
Currency fluctuations | 0.1 |  |  | 5.6 |  |  | 5.7 |
Balances as of March 31, 2018: |  |  |  |  |
Goodwill | 234.8 |  |  | 328.8 |  |  | 563.6 |
Accumulated impairment losses | (35.9 | ) |  | (17.3 | ) |  | (53.2 | )
Goodwill, net | $ | 198.9 |  |  | $ | 311.5 |  |  | $ | 510.4 |
In March 2018, we wrote off $1.4 million of goodwill from our Clinical Diagnostics segment as a result of a divestiture of a product line.
Schedule of identifiable purchased intangible assets with definite lives | Information regarding our identifiable purchased intangible assets with definite lives is as follows (in millions):
| March 31, 2018
| Average Remaining Life (years) |  | Purchase Price |  | Accumulated Amortization |  | Net Carrying Amount
Customer relationships/lists | 1-7 |  | $ | 94.3 |  |  | $ | (67.5 | ) |  | $ | 26.8 |
Know how | 1-8 |  | 197.5 |  |  | (162.1 | ) |  | 35.4 |
Developed product technology | 1-11 |  | 135.1 |  |  | (73.9 | ) |  | 61.2 |
Licenses | 1-11 |  | 77.0 |  |  | (37.5 | ) |  | 39.5 |
Tradenames | 1-6 |  | 4.1 |  |  | (3.2 | ) |  | 0.9 |
Covenants not to compete | 1-8 |  | 7.9 |  |  | (3.5 | ) |  | 4.4 |
Total definite-lived intangible assets |  |  | $ | 515.9 |  |  | $ | (347.7 | ) |  | $ | 168.2 |
| December 31, 2017
| Average Remaining Life (years) |  | Purchase Price |  | Accumulated Amortization |  | Net Carrying Amount
Customer relationships/lists | 1-7 |  | $ | 92.3 |  |  | $ | (64.4 | ) |  | $ | 27.9 |
Know how | 1-8 |  | 194.9 |  |  | (157.9 | ) |  | 37.0 |
Developed product technology | 1-12 |  | 133.3 |  |  | (70.3 | ) |  | 63.0 |
Licenses | 1-12 |  | 76.7 |  |  | (36.0 | ) |  | 40.7 |
Tradenames | 1-6 |  | 3.9 |  |  | (3.0 | ) |  | 0.9 |
Covenants not to compete | 1-8 |  | 7.9 |  |  | (3.3 | ) |  | 4.6 |
Total definite-lived intangible assets |  |  | $ | 509.0 |  |  | $ | (334.9 | ) |  | $ | 174.1 |
Finite-lived Intangible Assets Amortization Expense [Table Text Block] | Amortization expense related to purchased intangible assets is as follows (in millions):
| Three Months Ended |
| March 31, |
| 2018 |  | 2017 |
Amortization expense | $ | 7.4 |  |  | $ | 6.9 |  |

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