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3. Intangible Assets, Goodwill and Other (Tables)
 6 Months Ended
Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes to goodwill by segment Changes to goodwill by segment were as follows (in millions):
 
Life
Science
 
Clinical
Diagnostics
 
Total
Balances as of January 1, 2018:
 
 
 
 
 
Goodwill
$
234.7

 
$
324.6

 
$
559.3

Accumulated impairment losses
(35.9
)
 
(17.3
)
 
(53.2
)
Goodwill, net
198.8

 
307.3

 
506.1

 
 
 
 
 
 
Divestiture
—

 
(1.4
)
 
(1.4
)
Currency fluctuations
(0.2
)
 
(4.5
)
 
(4.7
)
 
 
 
 
 
 
Balances as of June 30, 2018:
 
 
 
 
 
Goodwill
234.5

 
318.7

 
553.2

Accumulated impairment losses
(35.9
)
 
(17.3
)
 
(53.2
)
Goodwill, net
$
198.6

 
$
301.4

 
$
500.0



In March 2018, we wrote off $1.4 million of goodwill from our Clinical Diagnostics segment as a result of a divestiture of a product line.
Schedule of identifiable purchased intangible assets with definite lives Information regarding our identifiable purchased intangible assets with definite lives is as follows (in millions):
 
June 30, 2018
 
Average
Remaining
Life (years)
 
Purchase
Price
 
Accumulated
Amortization
 
Net
Carrying
Amount
Customer relationships/lists
1-7
 
$
89.6

 
$
(65.7
)
 
$
23.9

Know how
1-8
 
192.3

 
(158.6
)
 
33.7

Developed product technology
3-11
 
131.8

 
(74.2
)
 
57.6

Licenses
1-11
 
76.4

 
(38.5
)
 
37.9

Tradenames
3-6
 
3.9

 
(3.2
)
 
0.7

Covenants not to compete
1-8
 
7.9

 
(3.7
)
 
4.2

     Total definite-lived intangible assets
 
 
$
501.9

 
$
(343.9
)
 
$
158.0


 
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
Finite-lived Intangible Assets Amortization Expense [Table Text Block] Amortization expense related to purchased intangible assets is as follows (in millions):

 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2018
 
2017
 
2018
 
2017
 
 
 
 
 
 
 
 
Amortization expense
$
7.4

 
$
8.7

 
$
14.8

 
$
15.6