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Goodwill and Other Identifiable Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Carrying Amount of Goodwill by Segment
The changes in the carrying amount of goodwill by segment were as follows:
In millions
December 31,
2017
Foreign currency 
translation/other 
June 30,
2018
Aquatic Systems
$
973.1

$
4.7

$
977.8

Filtration Solutions
472.1

(25.1
)
447.0

Flow Technologies
667.6

(3.6
)
664.0

Total goodwill
$
2,112.8

$
(24.0
)
$
2,088.8
Detail of Identifiable Intangible Assets
Identifiable intangible assets consisted of the following:
 
June 30,
2018
 
December 31,
2017
In millions
Cost
Accumulated
amortization
Net
 
Cost
Accumulated
amortization
Net
Definite-life intangibles
 
 
 
 
 
 
 
Customer relationships
$
351.2

$
(237.7
)
$
113.5

 
$
360.9

$
(229.9
)
$
131.0

Trade names
1.5

(1.5
)
—

 
1.5

(1.4
)
0.1

Proprietary technology and patents
115.4

(93.0
)
22.4

 
117.0

(89.3
)
27.7

Total definite-life intangibles
468.1

(332.2
)
135.9

 
479.4

(320.6
)
158.8

Indefinite-life intangibles
 
 
 
 
 
 
 
Trade names
160.6

—

160.6

 
163.0

—

163.0

Total intangibles
$
628.7

$
(332.2
)
$
296.5

 
$
642.4

$
(320.6
)
$
321.8
Estimated Future Amortization Expense for Identifiable Intangible Assets
Estimated future amortization expense for identifiable intangible assets during the remainder of 2018 and the next five years is as follows:
 
Q3-Q4
 
 
 
 
 
In millions
2018
2019
2020
2021
2022
2023
Estimated amortization expense
$
16.6

$
27.8

$
22.8

$
17.6

$
10.3

$
7.9