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4. Goodwill and other Purchased Intangible Assets Intangible Assets, Goodwill and Other (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Mar. 04, 2019
Goodwill [Line Items] |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  |  |  | $ 200
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill period start |  | $ 555,000 | $ 559,300 | $ 555,000 | $ 559,300 |
Accumulated impairment loss period start |  | (335,200) | (53,200) | (335,200) | (53,200) |
Goodwill, net period start |  | 219,770 | 506,100 | 219,770 | 506,100 |
Goodwill, Acquired During Period | $ 28,700 | 15,600 |  | 44,300 | 0 |
Goodwill, Written off Related to Sale of Business Unit |  |  |  | 0 | (1,400) |
Goodwill, Impairment Loss |  |  |  | 0 | 282,000 |
Currency fluctuations |  |  |  | 0 | (2,900) |
Goodwill period end |  |  |  | 599,300 | 555,000 |
Accumulated impairment loss period end |  |  |  | (335,200) | (335,200) |
Goodwill, net period end |  |  |  | 264,131 | 219,770 |
Life Science [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill period start |  | 234,500 | 234,700 | 234,500 | 234,700 |
Accumulated impairment loss period start |  | (41,800) | (35,900) | (41,800) | (35,900) |
Goodwill, net period start |  | 192,700 | 198,800 | 192,700 | 198,800 |
Goodwill, Acquired During Period |  |  |  | 15,600 | 0 |
Goodwill, Written off Related to Sale of Business Unit |  |  |  | 0 | 0 |
Goodwill, Impairment Loss |  |  |  | 0 | 5,900 |
Currency fluctuations |  |  |  | 0 | (200) |
Goodwill period end |  |  |  | 250,100 | 234,500 |
Accumulated impairment loss period end |  |  |  | (41,800) | (41,800) |
Goodwill, net period end |  |  |  | 208,300 | 192,700 |
Clinical Diagnostics [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill period start |  | 320,500 | 324,600 | 320,500 | 324,600 |
Accumulated impairment loss period start |  | (293,400) | (17,300) | (293,400) | (17,300) |
Goodwill, net period start |  | $ 27,100 | 307,300 | 27,100 | 307,300 |
Goodwill, Acquired During Period |  |  |  | 28,700 | 0 |
Goodwill, Written off Related to Sale of Business Unit |  |  | $ (1,400) | 0 | (1,400) |
Goodwill, Impairment Loss |  |  |  | 0 | 276,100 |
Currency fluctuations |  |  |  | 0 | (2,700) |
Goodwill period end |  |  |  | 349,200 | 320,500 |
Accumulated impairment loss period end |  |  |  | (293,400) | (293,400) |
Goodwill, net period end |  |  |  | $ 55,800 | 27,100 |
Pasteur Sanofi Diagnosics S.A. [Member] | Clinical Diagnostics [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill, Impairment Loss |  |  |  |  | 18,100 |
DiaMed [Member] | Clinical Diagnostics [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill, Impairment Loss |  |  |  |  | 247,200 |
Biotest AG [Member] | Clinical Diagnostics [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill, Impairment Loss |  |  |  |  | $ 10,800 |

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