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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 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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