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Goodwill and Other Identifiable Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Carrying Amount of Goodwill by Segment
The changes in the carrying amount of goodwill by reportable segment were as follows:
In millions
December 31,
2018
Acquisitions
Foreign currency 
translation/other 
June 30,
2019
Aquatic Systems
$
965.9

$
—

$
(1.1
)
$
964.8

Filtration Solutions
643.5

214.9

1.1

859.5

Flow Technologies
463.3

—

(0.1
)
463.2

Total goodwill
$
2,072.7

$
214.9

$
(0.1
)
$
2,287.5
Detail of Identifiable Intangible Assets
Identifiable intangible assets consisted of the following:
 
June 30,
2019
 
December 31,
2018
In millions
Cost
Accumulated
amortization
Net
 
Cost
Accumulated
amortization
Net
Definite-life intangibles
 
 
 
 
 
 
 
Customer relationships
$
422.6

$
(258.3
)
$
164.3

 
$
347.1

$
(247.9
)
$
99.2

Trade names
—

—

—

 
0.4

(0.4
)
—

Proprietary technology and patents
49.6

(34.8
)
14.8

 
86.2

(68.4
)
17.8

Total definite-life intangibles
472.2

(293.1
)
179.1

 
433.7

(316.7
)
117.0

Indefinite-life intangibles
 
 
 
 
 
 
 
Trade names
175.1

—

175.1

 
159.3

—

159.3

Total intangibles
$
647.3

$
(293.1
)
$
354.2

 
$
593.0

$
(316.7
)
$
276.3
Estimated Future Amortization Expense for Identifiable Intangible Assets
Estimated future amortization expense for identifiable intangible assets during the remainder of 2019 and the next five years is as follows:
 
Q3-Q4
 
 
 
 
 
In millions
2019
2020
2021
2022
2023
2024
Estimated amortization expense
$
16.0

$
27.6

$
22.5

$
15.3

$
13.0

$
12.4