Goodwill and Other Identifiable Intangible Assets - Changes in Carrying Amount of Goodwill by Segment (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Goodwill [Roll Forward]
Beginning Balance	$ 2,072.7	$ 2,112.8
Acquisitions/ divestitures	201.8
Foreign currency translation/other	(16.2)	(40.1)
Ending Balance	2,258.3	2,072.7
Aquatic Systems
Goodwill [Roll Forward]
Beginning Balance	965.9	973.1
Acquisitions/ divestitures	(3.7)
Foreign currency translation/other	(0.8)	(7.2)
Ending Balance	961.4	965.9
Filtration Solutions
Goodwill [Roll Forward]
Beginning Balance	643.5	667.6
Acquisitions/ divestitures	205.5
Foreign currency translation/other	(11.8)	(24.1)
Ending Balance	837.2	643.5
Flow Technologies
Goodwill [Roll Forward]
Beginning Balance	463.3	472.1
Acquisitions/ divestitures	0.0
Foreign currency translation/other	(3.6)	(8.8)
Ending Balance	$ 459.7	$ 463.3

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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-Section 45
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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

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Amount of increase (decrease), classified as other, of an asset representing the future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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