Goodwill and Other Identifiable Intangible Assets - Changes in Carrying Amount of Goodwill by Segment (Detail) $ in Millions	9 Months Ended
Sep. 30, 2018 USD ($)
Goodwill [Roll Forward]
Beginning Balance	$ 2,112.8
Foreign currency translation/other	(15.8)
Ending Balance	2,097.0
Aquatic Systems
Goodwill [Roll Forward]
Beginning Balance	973.1
Foreign currency translation/other	(6.0)
Ending Balance	967.1
Filtration Solutions
Goodwill [Roll Forward]
Beginning Balance	472.1
Foreign currency translation/other	(7.9)
Ending Balance	464.2
Flow Technologies
Goodwill [Roll Forward]
Beginning Balance	667.6
Foreign currency translation/other	(1.9)
Ending Balance	$ 665.7

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
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

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- Definition

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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