Goodwill and Other Identifiable Intangible Assets - Changes in Carrying Amount of Goodwill by Segment (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Goodwill [Roll Forward]
Beginning Balance	$ 2,112.8	$ 1,994.6
Acquisitions/ divestitures		27.3
Foreign currency translation/other	(40.1)	90.9
Ending Balance	2,072.7	2,112.8
Aquatic Systems
Goodwill [Roll Forward]
Beginning Balance	973.1	918.7
Acquisitions/ divestitures		0.0
Foreign currency translation/other	(7.2)	54.4
Ending Balance	965.9	973.1
Filtration Solutions
Goodwill [Roll Forward]
Beginning Balance	667.6	630.2
Acquisitions/ divestitures		27.3
Foreign currency translation/other	(24.1)	10.1
Ending Balance	643.5	667.6
Flow Technologies
Goodwill [Roll Forward]
Beginning Balance	472.1	445.7
Acquisitions/ divestitures		0.0
Foreign currency translation/other	(8.8)	26.4
Ending Balance	$ 463.3	$ 472.1

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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