v3.20.2
Leases - Undiscounted Future Minimum Payments Under Non-Cancellable Leases (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]      
Remainder of fiscal year $ 2.8    
Year one 7.5    
Year two 7.6    
Year three 7.2    
Year four 6.8    
Thereafter 22.8    
Total future minimum lease payments 54.7    
less effects of discounting 12.4    
Total lease liabilities 42.3    
Current portion of operating lease liabilities 4.0 $ 4.0  
Operating lease liabilities, net of current portion $ 38.3 40.7  
DiscoverOrg Holdings      
Business Acquisition [Line Items]      
Remainder of fiscal year   6.7  
Year one   7.5  
Year two   7.6  
Year three   7.2  
Year four   6.8  
Thereafter   22.7  
Total future minimum lease payments   58.5  
less effects of discounting   13.8  
Total lease liabilities   44.7  
Current portion of operating lease liabilities   4.0 $ 0.0
Operating lease liabilities, net of current portion   $ 40.7 $ 0.0