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Acquisitions - Summary of Aggregate Preliminary Estimates of Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Business Acquisition [Line Items]    
Goodwill $ 9,233.2 $ 9,261.8
2020 Acquisitions [Member]    
Business Acquisition [Line Items]    
Current assets 33.7  
Goodwill 189.9  
Other assets 5.4  
Total assets acquired 476.0  
Current liabilities 4.5  
Deferred income taxes 48.5  
Other long-term liabilities 1.8  
Total liabilities assumed 54.8  
Net assets acquired 421.2  
Technology [Member] | 2020 Acquisitions [Member]    
Business Acquisition [Line Items]    
Intangible assets subject to amortization: 147.9  
Trademarks and trade names [Member] | 2020 Acquisitions [Member]    
Business Acquisition [Line Items]    
Intangible assets subject to amortization: 1.5  
Customer relationships [Member] | 2020 Acquisitions [Member]    
Business Acquisition [Line Items]    
Intangible assets subject to amortization: 92.7  
Other [Member] | 2020 Acquisitions [Member]    
Business Acquisition [Line Items]    
Intangible assets subject to amortization: $ 4.9