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Deferred Revenues (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Deferred Revenue Arrangement [Line Items]    
Deferred revenue $ 1,707.1 $ 1,481.9
Security subscriptions    
Deferred Revenue Arrangement [Line Items]    
Deferred revenue 801.1 678.5
Software updates and maintenance    
Deferred Revenue Arrangement [Line Items]    
Deferred revenue 869.2 775.4
Other    
Deferred Revenue Arrangement [Line Items]    
Deferred revenue $ 36.8 $ 28.0