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Acquisitions - Summary of Aggregate Preliminary Estimates of Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]      
Goodwill $ 9,261.8 $ 9,599.7 $ 9,594.4
2020 Acquisitions [Member]      
Business Acquisition [Line Items]      
Current assets 33.6    
Goodwill 162.2    
Other assets 5.2    
Total assets acquired 497.7    
Current liabilities 4.7    
Deferred income taxes 70.1    
Other long-term liabilities 1.7    
Total liabilities assumed 76.5    
Net assets acquired 421.2    
Technology [Member] | 2020 Acquisitions [Member]      
Business Acquisition [Line Items]      
Intangible assets subject to amortization: 154.6    
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: 135.7    
Other [Member] | 2020 Acquisitions [Member]      
Business Acquisition [Line Items]      
Intangible assets subject to amortization: $ 4.9