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Goodwill and Intangible Assets - Intangible Assets (Parenthetical) (Detail) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	$ 589.5	$ 512.2
Completed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	321.7	236.4
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	196.7	203.7
Patents, Trademarks, Trade Names and Other [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	71.1	$ 72.1
Photon Control Inc [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	121.0
Photon Control Inc [Member] | Completed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	110.0
Photon Control Inc [Member] | Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	9.4
Photon Control Inc [Member] | Patents, Trademarks, Trade Names and Other [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	$ 1.6

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 926
-SubTopic 20
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=120154696&loc=d3e54445-107959

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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