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4. Intangible Assets, Goodwill and Other (Tables)
 3 Months Ended
Mar. 31, 2013
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, 2013:
 
 
 
 
 
Goodwill
$
193.6

 
$
330.0

 
$
523.6

Accumulated impairment losses
(27.2
)
 
(1.0
)
 
(28.2
)
Goodwill, net
166.4

 
329.0

 
495.4

 
 
 
 
 
 
Acquisitions
17.0

 
—

 
17.0

Currency fluctuations
(0.4
)
 
(9.9
)
 
(10.3
)
 
 
 
 
 
 
Balances as of March 31, 2013:
 
 
 
 
 
Goodwill
210.2

 
320.1

 
530.3

Accumulated impairment losses
(27.2
)
 
(1.0
)
 
(28.2
)
Goodwill, net
$
183.0

 
$
319.1

 
$
502.1
Schedule of identifiable purchased intangible assets with definite lives
Other than goodwill, we have no significant intangible assets with indefinite lives.  Information regarding our identifiable purchased intangible assets with definite lives is as follows (in millions):
 
March 31, 2013
 
Average
Remaining
Life (years)
 
Purchase
Price
 
Accumulated
Amortization
 
Net
Carrying
Amount
Customer relationships/lists
1-12
 
$
100.9

 
$
(39.1
)
 
$
61.8

Know how
1-13
 
185.8

 
(70.1
)
 
115.7

Developed product technology
1-14
 
103.8

 
(26.9
)
 
76.9

Licenses
1-13
 
43.7

 
(19.5
)
 
24.2

Tradenames
1-10
 
7.4

 
(4.2
)
 
3.2

Covenants not to compete
1-10
 
4.9

 
(0.4
)
 
4.5

Other
1
 
0.6

 
(0.2
)
 
0.4

 
 
 
$
447.1

 
$
(160.4
)
 
$
286.7


 
December 31, 2012
 
Average
Remaining
Life (years)
 
Purchase
Price
 
Accumulated
Amortization
 
Net
Carrying
Amount
Customer relationships/lists
1-12
 
$
102.8

 
$
(38.4
)
 
$
64.4

Know how
1-13
 
189.3

 
(67.1
)
 
122.2

Developed product technology
1-10
 
74.6

 
(25.1
)
 
49.5

Licenses
1-8
 
35.6

 
(18.7
)
 
16.9

Tradenames
1-10
 
7.4

 
(4.3
)
 
3.1

Covenants not to compete
1-10
 
4.9

 
(0.2
)
 
4.7

Other
1
 
0.1

 
—

 
0.1

 
 
 
$
414.7

 
$
(153.8
)
 
$
260.9
Amortization expense related to purchased intangible assets
Amortization expense related to purchased intangible assets is as follows (in millions):

 
Three Months Ended
 
March 31,
 
2013
 
2012
 
 
 
 
Amortization expense
$
11.1

 
$
10.8