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4. Intangible Assets, Goodwill and Other (Tables)
 3 Months Ended
Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes to goodwill by segment anges to goodwill by segment were as follows (in millions):
 
Life
Science
 
Clinical
Diagnostics
 
Total
Balances as of December 31, 2018:
 
 
 
 
 
Goodwill
$
234.5

 
$
320.5

 
$
555.0

Accumulated impairment losses
(41.8
)
 
(293.4
)
 
(335.2
)
Goodwill, net
192.7

 
27.1

 
219.8

 
 
 
 
 
 
Acquisitions
10.7

 
—

 
10.7

 
 
 
 
 
 
Balances as of March 31, 2019:
 
 
 
 
 
Goodwill
245.2

 
320.5

 
565.7

Accumulated impairment losses
(41.8
)
 
(293.4
)
 
(335.2
)
Goodwill, net
$
203.4

 
$
27.1

 
$
230.5


In conjunction with the purchase of all the issued and outstanding stock of a small private company in March 2019 (see Note 2, "Acquisitions"), we recorded $10.7 million of goodwill and $12.0 million of definite-lived intangible assets: $10.7 million of Know how and $1.3 million of Covenants not to compete.

Ot
Schedule of identifiable purchased intangible assets with definite lives formation regarding our identifiable purchased intangible assets with definite lives is as follows (in millions):
 
March 31, 2019
 
Average
Remaining
Life (years)
 
Purchase
Price
 
Accumulated
Amortization
 
Net
Carrying
Amount
Customer relationships/lists
1-6
 
$
87.2

 
$
(68.6
)
 
$
18.6

Know how
1-10
 
199.2

 
(159.1
)
 
40.1

Developed product technology
1-10
 
130.2

 
(87.8
)
 
42.4

Licenses
6-10
 
76.0

 
(41.6
)
 
34.4

Tradenames
2-6
 
3.9

 
(3.3
)
 
0.6

Covenants not to compete
3-7
 
4.5

 
(1.2
)
 
3.3

     Total definite-lived intangible assets
 
 
$
501.0

 
$
(361.6
)
 
$
139.4


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

 
Three Months Ended
 
March 31,
 
2019
 
2018
 
 
 
 
Amortization expense
$
5.5

 
$
7.4