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Business Acquisitions - Summary of the Estimated Acquisition Date Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jul. 31, 2018
Fair value of assets acquired and liabilities assumed:        
Goodwill $ 3,275.1 $ 2,976.5 $ 2,948.0  
Neustar, Inc. and Other Acquisitions        
Business Acquisition [Line Items]        
Total purchase consideration 455.8      
Fair value of assets acquired and liabilities assumed:        
Cash and cash equivalents 4.5      
Finite-lived intangible assets 96.2      
Deferred revenue (17.1)      
Other assets and liabilities, net (20.6)      
Total assets acquired, net of liabilities assumed 218.5      
Goodwill 237.3      
Neustar, Inc. and Other Acquisitions | Domain Portfolio Intangible Rights        
Fair value of assets acquired and liabilities assumed:        
Indefinite-lived intangible assets 88.5      
Neustar, Inc. and Other Acquisitions | Contractual-Based Intangible Assets        
Fair value of assets acquired and liabilities assumed:        
Indefinite-lived intangible assets $ 67.0      
Main Street Hub        
Business Acquisition [Line Items]        
Total purchase consideration       $ 182.0
Fair value of assets acquired and liabilities assumed:        
Cash and cash equivalents       8.0
Intangible assets, net       35.7
Other assets and liabilities, net       3.2
Total assets acquired, net of liabilities assumed       46.9
Goodwill       $ 135.1