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Acquisition - Summary of Business Combination and Allocated the Purchase Consideration to Assets Acquired and Liabilities Assumed Based on Estimated Fair Values (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Oct. 23, 2018
Dec. 31, 2017
Business Acquisition [Line Items]        
Goodwill $ 981.9 $ 950.5   $ 812.0
Dome9 Security Ltd        
Business Acquisition [Line Items]        
Goodwill     $ 138.2  
Core technology     27.0  
Net liabilities assumed     (4.5)  
Total     $ 160.7