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Goodwill and Other Identifiable Intangible Assets (Tables)
 9 Months Ended
Sep. 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 
September 30,
2019
Aquatic Systems
$
965.9

$
—

$
(1.0
)
$
964.9

Filtration Solutions
643.5

215.5

(19.8
)
839.2

Flow Technologies
463.3

—

(6.4
)
456.9

Total goodwill
$
2,072.7

$
215.5

$
(27.2
)
$
2,261.0
Detail of Identifiable Intangible Assets
Identifiable intangible assets consisted of the following:
 
September 30,
2019
 
December 31,
2018
In millions
Cost
Accumulated
amortization
Net
 
Cost
Accumulated
amortization
Net
Definite-life intangibles
 
 
 
 
 
 
 
Customer relationships
$
415.9

$
(260.8
)
$
155.1

 
$
347.1

$
(247.9
)
$
99.2

Trade names
—

—

—

 
0.4

(0.4
)
—

Proprietary technology and patents
42.8

(28.8
)
14.0

 
86.2

(68.4
)
17.8

Total definite-life intangibles
458.7

(289.6
)
169.1

 
433.7

(316.7
)
117.0

Indefinite-life intangibles
 
 
 
 
 
 
 
Trade names
172.3

—

172.3

 
159.3

—

159.3

Total intangibles
$
631.0

$
(289.6
)
$
341.4

 
$
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:
 
Q4
 
 
 
 
 
In millions
2019
2020
2021
2022
2023
2024
Estimated amortization expense
$
7.4

$
27.1

$
22.1

$
15.2

$
12.8

$
12.3