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Business Combinations - Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Millions
6 Months Ended
Oct. 09, 2019
Feb. 01, 2019
Jun. 30, 2020
Jun. 30, 2019
Feb. 01, 2020
Dec. 31, 2019
Business Acquisition [Line Items]            
Goodwill     $ 966.8     $ 966.8
Cash paid for acquisitions, net of cash acquired     $ 0.0 $ 714.9    
Komiko            
Business Acquisition [Line Items]            
Unearned revenue $ (0.2)          
Total identifiable net assets acquired 2.2          
Goodwill 6.3          
Total consideration 8.5          
Contingent earnout payments (0.2)          
Cash paid for acquisitions, net of cash acquired 8.3          
Komiko | Developed technology            
Business Acquisition [Line Items]            
Developed technology $ 2.4          
Pre-Acquisition ZI            
Business Acquisition [Line Items]            
Cash, cash equivalents, and restricted cash   $ 12.1        
Accounts receivable   22.1        
Prepaid expenses and other assets   4.2        
Property and equipment   6.3        
Operating lease right-of-use assets   28.6        
Intangible assets   322.0        
Accounts payable and other liabilities   (6.8)        
Lease liabilities   (28.6)        
Deferred tax liabilities   (80.1)        
Unearned revenue   (34.5)        
Total identifiable net assets acquired   245.3        
Goodwill   514.8        
Total consideration   760.1        
Deferred consideration   (33.2)     $ (25.0)  
Cash acquired   (12.1)        
Cash paid for acquisitions, net of cash acquired   $ 714.8