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Business Combinations - Additional Information (Details) - USD ($)
 4 Months Ended 12 Months Ended
Aug. 31, 2021
Mar. 10, 2021
Jul. 20, 2020
Dec. 12, 2019
Oct. 28, 2019
Dec. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 09, 2020
Business Acquisition [Line Items]                    
Total revenue             $ 3,342,200,000 $ 2,594,400,000 $ 2,163,000,000  
Goodwill           $ 125,100,000 125,100,000 93,000,000.0    
Liability incurred in connection with business combination             900,000 400,000 3,000,000.0  
AlaxaIA                    
Business Acquisition [Line Items]                    
Equity interests acquired 75.00%                  
Cash consideration $ 64,200,000                  
Non-controlling interests 17,800,000                  
Current liabilities assumed 20,200,000                  
Total revenue           $ 44,400,000        
Goodwill 25,500,000                  
Other intangible assets 48,000,000.0                  
Purchase price 64,200,000                  
Liabilities assumed $ 55,000,000.0                  
ShieldX Networks Inc (ShieldX)                    
Business Acquisition [Line Items]                    
Cash consideration   $ 10,800,000                
Goodwill   6,200,000                
Other net assets acquired   500,000                
ShieldX Networks Inc (ShieldX) | Developed technology                    
Business Acquisition [Line Items]                    
Other intangible assets   $ 4,100,000                
Panopta Holdings LLC                    
Business Acquisition [Line Items]                    
Goodwill                   $ 24,800,000
Other intangible assets                   9,000,000
Purchase price                   31,900,000
Liabilities assumed                   1,900,000
Goodwill expected to be deductible for tax purposes                   $ 15,800,000
OPAQ Networks, Inc (OPAQ)                    
Business Acquisition [Line Items]                    
Goodwill     $ 1,000,000              
Other intangible assets     4,700,000              
Other net assets acquired     2,300,000              
Purchase price     8,000,000              
Amount held in indemnity escrow, expected to be held for 12 months     $ 1,300,000              
Indemnity funds held in escrow, received by the company             $ 400,000      
CyberSponse, Inc.                    
Business Acquisition [Line Items]                    
Goodwill       $ 18,600,000            
Other intangible assets       9,100,000            
Purchase price       26,100,000            
Liabilities assumed       1,600,000            
Amount held in indemnity escrow, expected to be held for 12 months       2,800,000            
Liability incurred in connection with business combination       4,100,000            
Liability incurred in connection with business combination       3,000,000            
Liability incurred in connection with business combination, amount recognized as compensation cost in consolidated statement of income                 $ 1,100,000  
Amount held in indemnity escrow       3,800,000            
Amount held in indemnity escrow, expected to be held for 36 months       $ 1,000,000            
EnSilo Ltd.                    
Business Acquisition [Line Items]                    
Goodwill         $ 10,400,000          
Other intangible assets         10,800,000          
Purchase price         15,800,000          
Liabilities assumed         5,400,000          
Amount held in indemnity escrow, expected to be held for 12 months         $ 2,000,000          
Proceeds from release of indemnity escrow               $ 1,700,000