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GEOGRAPHIC INFORMATION AND SELECTED STATEMENTS OF INCOME DATA - Schedule of revenues by product lines (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Revenue from External Customer [Line Items]    
Total revenues $ 1,980.5 $ 1,861.3
Network Security Gateways    
Revenue from External Customer [Line Items]    
Total revenues 350.9 310.2
Other    
Revenue from External Customer [Line Items]    
Total revenues [1] 25.5 27.1
Products and licenses    
Revenue from External Customer [Line Items]    
Total revenues 376.4 337.3
Security subscriptions    
Revenue from External Customer [Line Items]    
Total revenues 893.9 812.0
Software updates and maintenance    
Revenue from External Customer [Line Items]    
Total revenues $ 710.2 $ 712.0
[1] Comprised of Endpoint security, Mobile security and Security management products, each comprising less than 10% of products and licenses revenues.