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Business Acquisitions - Narrative (Details)
$ in Millions
1 Months Ended 12 Months Ended
Aug. 31, 2020
USD ($)
Jul. 31, 2018
USD ($)
Dec. 31, 2020
USD ($)
business
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Business Acquisition [Line Items]          
Settlement of pre-existing contractual relationships $ 19.4        
Aggregate holdback and contingent consideration payments     $ 6.8 $ 88.0 $ 21.7
Neustar, Inc. and Other Acquisitions          
Business Acquisition [Line Items]          
Number of businesses acquired | business     4    
Expected tax deductible amount     $ 92.0    
Weighted average useful life     5 years 6 months    
Neustar, Inc.          
Business Acquisition [Line Items]          
Purchase consideration 217.2   $ 219.2    
Purchase consideration payable in future periods $ 1.3   $ 10.2    
Other Acquisitions          
Business Acquisition [Line Items]          
Number of businesses acquired | business     3    
Main Street Hub          
Business Acquisition [Line Items]          
Purchase consideration   $ 182.0      
Purchase consideration payable in future periods   $ 43.4      
Weighted average useful life   4 years 3 months 18 days      
Contingent earn-out payments (up to)   $ 50.0