v3.20.2
Derivatives and Hedging Activities - Fair Value and Presentation in the Consolidated Balance Sheets for Derivatives (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Derivatives, Fair Value [Line Items]    
Fair Value of Derivative Liabilities $ 13.1 $ 6.0
Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Fair Value of Derivative Liabilities 0.1 0.0
Cash Flow Hedging | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Fair Value of Derivative Liabilities 13.0 6.0
Cash Flow Hedging | DiscoverOrg Holdings    
Derivatives, Fair Value [Line Items]    
Fair Value of Derivative Liabilities   6.0
Accrued expenses and other current liabilities | Interest rate cap contract | Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Fair Value of Derivative Liabilities 0.0 0.0
Accrued expenses and other current liabilities | Cash Flow Hedging | Interest rate cap contract | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Fair Value of Derivative Liabilities 0.3 0.3
Accrued expenses and other current liabilities | Cash Flow Hedging | Interest rate swap contracts | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Fair Value of Derivative Liabilities 7.1 2.3
Accrued expenses and other current liabilities | Cash Flow Hedging | DiscoverOrg Holdings    
Derivatives, Fair Value [Line Items]    
Fair Value of Derivative Liabilities   2.6
Other long-term liabilities | Interest rate cap contract | Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Fair Value of Derivative Liabilities 0.1 0.0
Other long-term liabilities | Cash Flow Hedging | Interest rate cap contract | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Fair Value of Derivative Liabilities 0.4 0.4
Other long-term liabilities | Cash Flow Hedging | Interest rate swap contracts | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Fair Value of Derivative Liabilities $ 5.2 3.0
Other long-term liabilities | Cash Flow Hedging | DiscoverOrg Holdings    
Derivatives, Fair Value [Line Items]    
Fair Value of Derivative Liabilities   $ 3.4