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4. Intangible Assets, Goodwill and Other (Tables)
 9 Months Ended
Sep. 30, 2017
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, 2017:
 
 
 
 
 
Goodwill
$
207.1

 
$
311.7

 
$
518.8

Accumulated impairment losses
(27.2
)
 
(14.5
)
 
(41.7
)
Goodwill, net
179.9

 
297.2

 
477.1

 
 
 
 
 
 
Acquisitions
28.1

 
—

 
28.1

Currency fluctuations
0.6

 
14.9

 
15.5

 
 
 
 
 
 
Balances as of September 30, 2017:
 
 
 
 
 
Goodwill
235.8

 
326.6

 
562.4

Accumulated impairment losses
(27.2
)
 
(14.5
)
 
(41.7
)
Goodwill, net
$
208.6

 
$
312.1

 
$
520.7



In conjunction with the purchase of all the issued and outstanding stock of RainDance Technologies, Inc. in February 2017 (see Note 2, "Acquisitions), we recorded $28.1 million of goodwill and $37.6 million of definite-lived intangible assets: $36.4 million of licenses, $1.0 million of developed product technology and $0.2 million of tradenames.
Schedule of identifiable purchased intangible assets with definite lives Information regarding our identifiable purchased intangible assets with definite lives is as follows (in millions):
 
September 30, 2017
 
Average
Remaining
Life (years)
 
Purchase
Price
 
Accumulated
Amortization
 
Net
Carrying
Amount
Customer relationships/lists
1-8
 
$
91.8

 
$
(62.4
)
 
$
29.4

Know how
1-9
 
193.4

 
(154.7
)
 
38.7

Developed product technology
1-12
 
132.5

 
(67.2
)
 
65.3

Licenses
1-12
 
76.6

 
(34.7
)
 
41.9

Tradenames
1-7
 
3.9

 
(2.9
)
 
1.0

Covenants not to compete
1-9
 
7.9

 
(3.1
)
 
4.8

     Total definite-lived intangible assets
 
 
$
506.1

 
$
(325.0
)
 
$
181.1


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

 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2017
 
2016
 
2017
 
2016
 
 
 
 
 
 
 
 
Amortization expense
$
7.8

 
$
9.5

 
$
23.4

 
$
28.5