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Deferred Revenues (Detail) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Deferred Revenue Arrangement [Line Items]    
Deferred revenue $ 1,877.8 $ 1,707.1
Security subscriptions    
Deferred Revenue Arrangement [Line Items]    
Deferred revenue 932.1 801.1
Software updates and maintenance    
Deferred Revenue Arrangement [Line Items]    
Deferred revenue 904.7 869.2
Other    
Deferred Revenue Arrangement [Line Items]    
Deferred revenue $ 41.0 $ 36.8