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Revenues by Product Lines (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Revenue from External Customer [Line Items]      
Total revenues $ 2,166.8 $ 2,064.9 $ 1,994.8
Network Security Gateways      
Revenue from External Customer [Line Items]      
Total revenues 480.5 472.4 455.9
Other      
Revenue from External Customer [Line Items]      
Total revenues 33.4 41.2 54.9
Products and licenses      
Revenue from External Customer [Line Items]      
Total revenues 513.9 513.6 510.8
Security subscriptions      
Revenue from External Customer [Line Items]      
Total revenues 755.2 671.1 610.3
Software updates and maintenance      
Revenue from External Customer [Line Items]      
Total revenues $ 897.7 $ 880.2 $ 873.7