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4. Intangible Assets, Goodwill and Other (Tables)
 12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes to goodwill by segment
Changes to goodwill by segment were as follows (in millions):
 
 
2017
 
 
2016
 
 
Life
Science
 
Clinical
Diagnostics
 
Total
 
 
Life
Science
 
Clinical
Diagnostics
 
Total
Balances as of January 1:
 
 
 
 
 
 
 
 
 
 
 
 
 
Goodwill
 
$
207.1

 
$
311.7

 
$
518.8

 
 
$
207.2

 
$
316.9

 
$
524.1

Accumulated impairment losses and write-offs
 
(27.2
)
 
(14.5
)
 
(41.7
)
 
 
(27.2
)
 
(1.0
)
 
(28.2
)
Goodwill, net
 
179.9

 
297.2

 
477.1

 
 
180.0

 
315.9

 
495.9

Acquisitions
 
26.2

 
—

 
26.2

 
 
0.1

 
—

 
0.1

Impairment
 
(8.7
)
 
(2.8
)
 
(11.5
)
 
 
—

 
(13.5
)
 
(13.5
)
Currency fluctuations
 
1.4

 
12.9

 
14.3

 
 
(0.2
)
 
(5.2
)
 
(5.4
)
Balances as of December 31:
 
 
 
 
 
 
 
 
 
 
 
 
 
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
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, 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


 
December 31, 2016
 
Average
Remaining
Life (years)
 
Purchase
Price
 
Accumulated
Amortization
 
Net
Carrying
Amount
Customer relationships/lists
1-8
 
$
84.4

 
$
(52.8
)
 
$
31.6

Know how
1-9
 
182.6

 
(136.9
)
 
45.7

Developed product technology
3-12
 
125.9

 
(56.3
)
 
69.6

Licenses
1-9
 
39.0

 
(30.6
)
 
8.4

Tradenames
4-8
 
3.5

 
(2.5
)
 
1.0

Covenants not to compete
2-9
 
7.8

 
(2.5
)
 
5.3

     Total definite-lived intangible assets
 
 
$
443.2

 
$
(281.6
)
 
$
161.6