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Acquisitions - Summary of Allocation of Purchase Price for Acquisitions of Acquiree (Detail) - USD ($)
$ in Millions
Mar. 31, 2020
Mar. 24, 2020
Dec. 31, 2019
Business Acquisition [Line Items]      
Goodwill $ 7,859.7   $ 7,959.9
Captricity [Member]      
Business Acquisition [Line Items]      
Accounts receivable   $ 0.3  
Other assets   3.1  
Goodwill   8.3  
Accounts payable   (0.4)  
Accrued employee compensation and benefits   (0.3)  
Deferred revenue   (2.1)  
Other liabilities assumed   (0.8)  
Consideration paid, net of cash acquired   15.3  
Acquired Client Relationships and Contracts [Member] | Captricity [Member]      
Business Acquisition [Line Items]      
Intangible assets acquired   4.3  
Completed Technology [Member] | Captricity [Member]      
Business Acquisition [Line Items]      
Intangible assets acquired   $ 2.9