Goodwill and Other Identifiable Intangible Assets - Detail of Identifiable Intangible Assets (Detail) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Acquired Intangible Assets By Major Class [Line Items]
Cost	$ 511.9	$ 482.8
Accumulated amortization	(349.4)	(337.5)
Net	162.5	145.3
Cost	689.0	663.4
Net	339.6	325.9
Customer relationships
Acquired Intangible Assets By Major Class [Line Items]
Cost	465.3	435.9
Accumulated amortization	(318.0)	(308.1)
Net	147.3	127.8
Proprietary technology and patents
Acquired Intangible Assets By Major Class [Line Items]
Cost	46.6	46.9
Accumulated amortization	(31.4)	(29.4)
Net	15.2	17.5
Trade names intangibles
Acquired Intangible Assets By Major Class [Line Items]
Net, indefinite-life intangibles	$ 177.1	$ 180.6

Acquired Intangible Assets by Major Class [Line Items]

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

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Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

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Amount before accumulated amortization of intangible assets, excluding goodwill.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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