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Goodwill and Intangible Assets - Intangible Assets (Detail) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	$ 875.5	$ 875.5
Accumulated Impairment Charges	(1.5)	(1.5)
Accumulated Amortization	(338.1)	(308.0)
Foreign Currency Translation	(1.5)	(1.4)
Intangible assets, net	534.4	564.6
Completed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	446.4	446.4
Accumulated Impairment Charges	(0.1)	(0.1)
Accumulated Amortization	(196.7)	(178.3)
Foreign Currency Translation	(0.2)	(0.2)
Intangible assets, net	249.4	267.8
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	308.2	308.2
Accumulated Impairment Charges	(1.4)	(1.4)
Accumulated Amortization	(94.4)	(84.2)
Foreign Currency Translation	(1.1)	(1.4)
Intangible assets, net	211.3	221.2
Patents, Trademarks, Trade Names and Other [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	120.9	120.9
Accumulated Amortization	(47.0)	(45.5)
Foreign Currency Translation	(0.2)	0.2
Intangible assets, net	$ 73.7	$ 75.6

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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
-Subparagraph (a)(1)
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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.

+ 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.

+ References

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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