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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
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Business Acquisition [Line Items]      
Goodwill $ 1,196.2 $ 1,002.2 $ 981.9
Avanan [Member]      
Business Acquisition [Line Items]      
Goodwill 194.2    
Core technology 26.7    
Customer relationship 5.8    
Net assets assumed 0.4    
Total $ 227.1    
Business combination core technology weighted average useful life 8 years    
Business combination customer relationship weighted average useful life 4 years