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

$
(3.7
)
$
(0.8
)
$
961.4

Filtration Solutions
643.5

205.5

(11.8
)
837.2

Flow Technologies
463.3

—

(3.6
)
459.7

Total goodwill
$
2,072.7

$
201.8

$
(16.2
)
$
2,258.3

In millions
December 31, 2017
Foreign currency
translation/other
December 31, 2018
Aquatic Systems
$
973.1

$
(7.2
)
$
965.9

Filtration Solutions
667.6

(24.1
)
643.5

Flow Technologies
472.1

(8.8
)
463.3

Total goodwill
$
2,112.8

$
(40.1
)
$
2,072.7
Identifiable Intangible Assets
Identifiable intangible assets consisted of the following at December 31:
  
2019
 
2018
In millions
Cost
Accumulated
amortization
Net
 
Cost
Accumulated
amortization
Net
Definite-life intangibles
 
 
 
 
 
 
 
Customer relationships
$
418.1

$
(269.1
)
$
149.0

 
$
347.1

$
(247.9
)
$
99.2

Trade names
—

—

—

 
0.4

(0.4
)
—

Proprietary technology and patents
42.3

(25.5
)
16.8

 
86.2

(68.4
)
17.8

Total finite-life intangibles
460.4

(294.6
)
165.8

 
433.7

(316.7
)
117.0

Indefinite-life intangibles
 
 
 
 
 
 
 
Trade names
173.4

—

173.4

 
159.3

—

159.3

Total intangibles
$
633.8

$
(294.6
)
$
339.2

 
$
593.0

$
(316.7
)
$
276.3
Estimated Future Amortization Expense for Identifiable Intangible Assets
Estimated future amortization expense for identifiable intangible assets during the next five years is as follows:
In millions
2020
2021
2022
2023
2024
Estimated amortization expense
$
28.3

$
23.3

$
16.3

$
13.9

$
12.6