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Goodwill and Intangible Assets - Intangible Assets (Detail) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	$ 996.5	$ 875.5
Accumulated Impairment Charges	(1.5)	(1.5)
Accumulated Amortization	(403.3)	(363.2)
Foreign Currency Translation	(2.2)	1.4
Intangible assets, net	589.5	512.2
Completed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	556.4	446.4
Accumulated Impairment Charges	(0.1)	(0.1)
Accumulated Amortization	(232.2)	(209.8)
Foreign Currency Translation	(2.4)	(0.1)
Intangible assets, net	321.7	236.4
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	317.6	308.2
Accumulated Impairment Charges	(1.4)	(1.4)
Accumulated Amortization	(119.6)	(104.8)
Foreign Currency Translation	0.1	1.7
Intangible assets, net	196.7	203.7
Patents, Trademarks, Trade Names and Other [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	122.5	120.9
Accumulated Amortization	(51.5)	(48.6)
Foreign Currency Translation	0.1	(0.2)
Intangible assets, net	$ 71.1	$ 72.1

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- Definition

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 of foreign currency translation gain (loss) which increases (decreases) assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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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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-Publisher FASB
-Name Accounting Standards Codification
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

+ References

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