PENTAIR LTD | 2013 | FY | 3

Goodwill and Other Identifiable Intangible Assets
The changes in the carrying amount of goodwill for the year ended December 31, 2013 and December 31, 2012 by reportable segment were as follows:
In millions
December 31, 2012
Acquisitions/
divestitures
Foreign currency
translation/other
December 31, 2013
Valves & Controls
$
1,511.6

$
—

$
—

$
1,511.6

Process Technologies
1,500.4

7.6

16.5

1,524.5

Flow Technologies
937.3

(5.7
)
8.5

940.1

Technical Solutions
1,161.7

(5.3
)
1.6

1,158.0

Total goodwill
$
5,111.0

$
(3.4
)
$
26.6

$
5,134.2

In millions
December 31, 2011
Acquisitions/
divestitures
Foreign currency
translation/other
December 31, 2012
Valves & Controls
$
—

$
1,511.6

$
—

$
1,511.6

Process Technologies
1,396.9

111.0

(7.5
)
1,500.4

Flow Technologies
597.9

318.5

20.9

937.3

Technical Solutions
279.1

881.6

1.0

1,161.7

Total goodwill
$
2,273.9

$
2,822.7

$
14.4

$
5,111.0


In 2011, we recorded an impairment charge of $200.5 million in Process Technologies. Accumulated goodwill impairment losses were $200.5 million as of December 31, 2013 and December 31, 2012.
Identifiable intangible assets consisted of the following at December 31:
  
2013
 
2012
In millions
Cost
Accumulated
amortization
Net
 
Cost
Accumulated
amortization
Net
Finite-life intangibles
 
 
 
 
 
 
 
Customer relationships
$
1,286.8

$
(243.8
)
$
1,043.0

 
$
1,291.5

$
(152.8
)
$
1,138.7

Trade names
2.1

(0.9
)
1.2

 
1.5

(0.7
)
0.8

Proprietary technology and patents
264.6

(80.1
)
184.5

 
263.7

(57.7
)
206.0

Backlog
2.6

(1.2
)
1.4

 
43.7

(18.2
)
25.5

Total finite-life intangibles
1,556.1

(326.0
)
1,230.1

 
1,600.4

(229.4
)
1,371.0

Indefinite-life intangibles
 
 
 
 
 
 
 
Trade names
546.0

—

546.0

 
555.9

—

555.9

Total intangibles
$
2,102.1

$
(326.0
)
$
1,776.1

 
$
2,156.3

$
(229.4
)
$
1,926.9


Identifiable intangible asset amortization expense in 2013, 2012 and 2011 was $137.2 million, $76.0 million and $41.9 million, respectively.
In 2013 we recorded an impairment charge for trade name intangible assets of $11.0 million in Technical Solutions. In 2012 we recorded an impairment charge for trade name intangible assets of $23.2 million, $25.9 million and $11.6 million in Process Technologies, Flow Technologies and Technical Solutions, respectively.
Estimated future amortization expense for identifiable intangible assets during the next five years is as follows:
In millions
2014
2015
2016
2017
2018
Estimated amortization expense
$
115.9

$
115.5

$
114.4

$
112.9

$
110.2

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