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Deferred Revenues (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Deferred Revenue Arrangement [Line Items] |  |
Deferred revenue | $ 1,481.9 | $ 1,386.7
Security subscriptions |  |
Deferred Revenue Arrangement [Line Items] |  |
Deferred revenue | 678.5 | 613.1
Software updates and maintenance |  |
Deferred Revenue Arrangement [Line Items] |  |
Deferred revenue | 775.4 | 757.4
Other |  |
Deferred Revenue Arrangement [Line Items] |  |
Deferred revenue | $ 28.0 | $ 16.2

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- Definition Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(5)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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