Goodwill and Other Identifiable Intangible Assets - Detail of Identifiable Intangible Assets (Detail) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Acquired Intangible Assets By Major Class [Line Items]
Cost	$ 602.9	$ 605.1
Accumulated amortization	(356.4)	(352.2)
Net	246.5	252.9
Cost	776.4	780.2
Net	420.0	428.0
Customer relationships
Acquired Intangible Assets By Major Class [Line Items]
Cost	556.8	558.8
Accumulated amortization	(323.7)	(320.1)
Net	233.1	238.7
Proprietary technology and patents
Acquired Intangible Assets By Major Class [Line Items]
Cost	46.1	46.3
Accumulated amortization	(32.7)	(32.1)
Net	13.4	14.2
Trade names intangibles
Acquired Intangible Assets By Major Class [Line Items]
Net, indefinite-life intangibles	$ 173.5	$ 175.1

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

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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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