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3. Intangible Assets, Goodwill and Other | 6 Months Ended
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Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets Disclosure | GOODWILL AND OTHER PURCHASED INTANGIBLE ASSETS 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 | (0.2 | ) |  | (4.5 | ) |  | (4.7 | )
Balances as of June 30, 2018: |  |  |  |  |
Goodwill | 234.5 |  |  | 318.7 |  |  | 553.2 |
Accumulated impairment losses | (35.9 | ) |  | (17.3 | ) |  | (53.2 | )
Goodwill, net | $ | 198.6 |  |  | $ | 301.4 |  |  | $ | 500.0 |
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. Other than goodwill, we have no intangible assets with indefinite lives. Information regarding our identifiable purchased intangible assets with definite lives is as follows (in millions):
| June 30, 2018
| Average Remaining Life (years) |  | Purchase Price |  | Accumulated Amortization |  | Net Carrying Amount
Customer relationships/lists | 1-7 |  | $ | 89.6 |  |  | $ | (65.7 | ) |  | $ | 23.9 |
Know how | 1-8 |  | 192.3 |  |  | (158.6 | ) |  | 33.7 |
Developed product technology | 3-11 |  | 131.8 |  |  | (74.2 | ) |  | 57.6 |
Licenses | 1-11 |  | 76.4 |  |  | (38.5 | ) |  | 37.9 |
Tradenames | 3-6 |  | 3.9 |  |  | (3.2 | ) |  | 0.7 |
Covenants not to compete | 1-8 |  | 7.9 |  |  | (3.7 | ) |  | 4.2 |
Total definite-lived intangible assets |  |  | $ | 501.9 |  |  | $ | (343.9 | ) |  | $ | 158.0 |
| 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 |
Amortization expense related to purchased intangible assets is as follows (in millions):
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Amortization expense | $ | 7.4 |  |  | $ | 8.7 |  |  | $ | 14.8 |  |  | $ | 15.6 |

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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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