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Revenues by Product Lines (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Revenue from External Customer [Line Items]      
Total revenues $ 2,329.9 $ 2,166.8 $ 2,064.9
Network Security Gateways      
Revenue from External Customer [Line Items]      
Total revenues 507.8 480.5 472.4
Other      
Revenue from External Customer [Line Items]      
Total revenues 47.1 33.4 41.2
Products and licenses      
Revenue from External Customer [Line Items]      
Total revenues 554.9 513.9 513.6
Security subscriptions      
Revenue from External Customer [Line Items]      
Total revenues 858.0 755.2 671.1
Software updates and maintenance      
Revenue from External Customer [Line Items]      
Total revenues $ 917.0 $ 897.7 $ 880.2