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Acquisition - Summary of Business Combination and Allocated the Purchase Consideration to Assets Acquired and Liabilities Assumed Based on Estimated Fair Values (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Oct. 23, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 981.9 | $ 950.5 |  | $ 812.0
Dome9 Security Ltd |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill |  |  | $ 138.2 |
Core technology |  |  | 27.0 |
Net liabilities assumed |  |  | (4.5) |
Total |  |  | $ 160.7 |

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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472 + Details
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