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Deferred Revenues (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
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