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4. Intangible Assets, Goodwill and Other (Tables)
 12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes to goodwill by segment
Changes to goodwill by segment were as follows (in millions):
 
 
2018
 
 
2017
 
 
Life
Science
 
Clinical
Diagnostics
 
Total
 
 
Life
Science
 
Clinical
Diagnostics
 
Total
Balances as of January 1:
 
 
 
 
 
 
 
 
 
 
 
 
 
Goodwill
 
$
234.7

 
$
324.6

 
$
559.3

 
 
$
207.1

 
$
311.7

 
$
518.8

Accumulated impairment losses and write-offs
 
(35.9
)
 
(17.3
)
 
(53.2
)
 
 
(27.2
)
 
(14.5
)
 
(41.7
)
Goodwill, net
 
198.8

 
307.3

 
506.1

 
 
179.9

 
297.2

 
477.1

Acquisitions
 
—

 
—

 
—

 
 
26.2

 
—

 
26.2

Divestiture
 
—

 
(1.4
)
 
(1.4
)
 
 
—

 
—

 
—

Impairment
 
(5.9
)
 
(276.1
)
 
(282.0
)
 
 
(8.7
)
 
(2.8
)
 
(11.5
)
Currency fluctuations
 
(0.2
)
 
(2.7
)
 
(2.9
)
 
 
1.4

 
12.9

 
14.3

Balances as of December 31:
 
 
 
 
 
 
 
 
 
 
 
 
 
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
Schedule of Finite-Lived Intangible Assets by Major-Class Information regarding our identifiable purchased intangible assets with definite lives is as follows (in millions):
 
December 31, 2018
 
Average
Remaining
Life (years)
 
Purchase
Price
 
Accumulated
Amortization
 
Net
Carrying
Amount
Customer relationships/lists
1-6
 
$
88.7

 
$
(68.3
)
 
$
20.4

Know how
1-7
 
190.6

 
(159.8
)
 
30.8

Developed product technology
1-10
 
130.4

 
(86.6
)
 
43.8

Licenses
7-11
 
76.3

 
(40.9
)
 
35.4

Tradenames
2-6
 
3.9

 
(3.3
)
 
0.6

Covenants not to compete
7
 
3.2

 
(1.1
)
 
2.1

     Total definite-lived intangible assets
 
 
$
493.1

 
$
(360.0
)
 
$
133.1


 
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