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4. Intangible Assets, Goodwill and Other (Tables)
 12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes to goodwill by segment

Changes to goodwill by segment were as follows (in millions):
 
 
2019
 
 
2018
 
 
Life
Science
 
Clinical
Diagnostics
 
Total
 
 
Life
Science
 
Clinical
Diagnostics
 
Total
Balances as of January 1:
 
 
 
 
 
 
 
 
 
 
 
 
 
Goodwill
 
$
234.5

 
$
320.5

 
$
555.0

 
 
$
234.7

 
$
324.6

 
$
559.3

Accumulated impairment losses and write-offs
 
(41.8
)
 
(293.4
)
 
(335.2
)
 
 
(35.9
)
 
(17.3
)
 
(53.2
)
Goodwill, net
 
192.7

 
27.1

 
219.8

 
 
198.8

 
307.3

 
506.1

Acquisitions
 
15.6

 
28.7

 
44.3

 
 
—

 
—

 
—

Divestiture
 
—

 
—

 
—

 
 
—

 
(1.4
)
 
(1.4
)
Impairment
 
—

 
—

 
—

 
 
(5.9
)
 
(276.1
)
 
(282.0
)
Currency fluctuations
 
—

 
—

 
—

 
 
(0.2
)
 
(2.7
)
 
(2.9
)
Balances as of December 31:
 
 
 
 
 
 
 
 
 
 
 
 
 
Goodwill
 
250.1

 
349.2

 
599.3

 
 
234.5

 
320.5

 
555.0

Accumulated impairment losses and write-offs
 
(41.8
)
 
(293.4
)
 
(335.2
)
 
 
(41.8
)
 
(293.4
)
 
(335.2
)
Goodwill, net
 
$
208.3

 
$
55.8

 
$
264.1

 
 
$
192.7

 
$
27.1

 
$
219.8
Schedule of Finite-Lived Intangible Assets by Major-Class
Information regarding our identifiable purchased intangible assets with definite and indefinite lives is as follows (in millions):
 
December 31, 2019
 
Weighted-Average Amortization Period (years)
 
Purchase
Price
 
Accumulated
Amortization
 
Net
Carrying
Amount
Customer relationships/lists
6.36
 
$
107.2

 
$
(74.3
)
 
$
32.9

Know how
5.71
 
188.5

 
(162.6
)
 
25.9

Developed product technology
8.31
 
144.2

 
(93.9
)
 
50.3

Licenses
8.74
 
76.0

 
(44.4
)
 
31.6

Tradenames
8.50
 
6.4

 
(3.6
)
 
2.8

Covenants not to compete
6.01
 
3.2

 
(1.4
)
 
1.8

Other
—
 
0.1

 
(0.1
)
 
—

     Total definite-lived intangible assets
 
 
525.6

 
(380.3
)
 
145.3

In-process research and development
 
 
0.2

 
—

 
0.2

     Total purchased intangible assets
 
 
$
525.8

 
$
(380.3
)
 
$
145.5


 
December 31, 2018
 
Weighted-Average Amortization Period (years)
 
Purchase
Price
 
Accumulated
Amortization
 
Net
Carrying
Amount
Customer relationships/lists
3.98
 
$
88.7

 
$
(68.3
)
 
$
20.4

Know how
6.64
 
190.6

 
(159.8
)
 
30.8

Developed product technology
8.34
 
130.4

 
(86.6
)
 
43.8

Licenses
9.72
 
76.3

 
(40.9
)
 
35.4

Tradenames
3.42
 
3.9

 
(3.3
)
 
0.6

Covenants not to compete
7.01
 
3.2

 
(1.1
)
 
2.1

     Total definite-lived intangible assets
 
 
$
493.1

 
$
(360.0
)
 
$
133.1