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Goodwill and Other Identifiable Intangible Assets (Tables)
9 Months Ended
Sep. 30, 2016
Carrying Amount of Goodwill by Segment
The changes in the carrying amount of goodwill by segment were as follows:
In millions
December 31,
2015
Purchase
accounting
adjustments
Foreign currency 
translation/other 
September 30,
2016
Water Quality Systems
$
1,121.1

$

$
6.0

$
1,127.1

Flow & Filtration Solutions
882.7


13.7

896.4

Technical Solutions
2,255.2

(30.9
)
3.9

2,228.2

Total goodwill
$
4,259.0

$
(30.9
)
$
23.6

$
4,251.7

Detail of Identifiable Intangible Assets
Identifiable intangible assets consisted of the following:
 
September 30,
2016
 
December 31,
2015
In millions
Cost
Accumulated
amortization
Net
 
Cost
Accumulated
amortization
Net
Finite-life intangibles
 
 
 
 
 
 
 
Customer relationships
$
1,491.3

$
(332.6
)
$
1,158.7

 
$
1,482.9

$
(266.9
)
$
1,216.0

Trade names
1.9

(1.4
)
0.5

 
1.8

(1.2
)
0.6

Proprietary technology and patents
145.5

(100.1
)
45.4

 
144.1

(89.8
)
54.3

Total finite-life intangibles
1,638.7

(434.1
)
1,204.6

 
1,628.8

(357.9
)
1,270.9

Indefinite-life intangibles
 
 
 
 
 
 
 
Trade names
478.4


478.4

 
476.5


476.5

Total intangibles, net
$
2,117.1

$
(434.1
)
$
1,683.0

 
$
2,105.3

$
(357.9
)
$
1,747.4

Estimated Future Amortization Expense for Identifiable Intangible Assets
Estimated future amortization expense for identifiable intangible assets during the remainder of 2016 and the next five years is as follows:
 
Q4
 
 
 
 
 
In millions
2016
2017
2018
2019
2020
2021
Estimated amortization expense
$
21.3

$
85.2

$
85.0

$
84.3

$
82.1

$
78.9