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Derivatives and Hedging Activities - Outstanding Interest Rate Derivatives Designated as Cash Flow Hedges of Interest Rate Risk (Details) - Designated as Hedging Instrument
$ in Millions
Jun. 30, 2020
USD ($)
instrument
Dec. 31, 2019
USD ($)
instrument
Apr. 30, 2019
USD ($)
instrument
Cash Flow Hedging      
Derivatives, Fair Value [Line Items]      
Notional Aggregate Principal Amount | $ $ 850.0    
Interest rate cap contract | Cash Flow Hedging      
Derivatives, Fair Value [Line Items]      
Number of Instruments | instrument 1   1
Notional Aggregate Principal Amount | $ $ 406.4   $ 500.0
Interest Cap (as a percent) 3.50%    
Interest rate cap contract | Cash Flow Hedging | DiscoverOrg Holdings      
Derivatives, Fair Value [Line Items]      
Number of Instruments | instrument   1  
Notional Aggregate Principal Amount | $   $ 500.0 $ 500.0
Interest Cap (as a percent)   3.50%  
Interest rate swap contracts | DiscoverOrg Holdings      
Derivatives, Fair Value [Line Items]      
Number of Instruments | instrument     2
Interest rate swap contracts | Cash Flow Hedging      
Derivatives, Fair Value [Line Items]      
Number of Instruments | instrument 2   2
Notional Aggregate Principal Amount | $ $ 350.0   $ 350.0
Swap Rate (as a percent) 2.301%    
Interest rate swap contracts | Cash Flow Hedging | DiscoverOrg Holdings      
Derivatives, Fair Value [Line Items]      
Number of Instruments | instrument   2  
Notional Aggregate Principal Amount | $   $ 350.0 $ 350.0
Swap Rate (as a percent)   2.301%