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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

X

- Definition

Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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