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Take-Private Transaction - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended 11 Months Ended 12 Months Ended
Feb. 08, 2019
Jun. 19, 2018
Jun. 30, 2020
Dec. 31, 2019
Dec. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Feb. 07, 2019
Dec. 31, 2018
Business Acquisition [Line Items]                  
Cash value per share of stock repurchased and retired during period (USD per share) $ 145.00                
Transaction costs           $ 0.2      
Line of Credit | Five-Year Credit Agreement                  
Business Acquisition [Line Items]                  
Term of debt instrument   5 years              
Senior Notes | Senior Notes due 2020                  
Business Acquisition [Line Items]                  
Interest rate on debt instrument (as a percent)   4.00%              
Repurchased face amount of debt instrument   $ 300.0              
Senior Notes | Senior Notes Due 2022                  
Business Acquisition [Line Items]                  
Interest rate on debt instrument (as a percent)   4.37%              
Repurchased face amount of debt instrument   $ 300.0              
Dun & Bradstreet                  
Business Acquisition [Line Items]                  
Stock price (USD per share) $ 145.00                
Take Private Acquisition, Dun & Bradstreet                  
Business Acquisition [Line Items]                  
Cash consideration transferred from issuance of common and preferred shares $ 3,076.8                
Borrowings from notes issuances and Credit Facilities 4,043.0                
Consideration transferred 6,068.7                
Amounts paid to equity holders 5,431.2     $ 5,431.2 $ 5,431.2        
Debt repayment $ 637.5     637.5 637.5        
Transaction costs               $ 52.0  
Reduction of goodwill       $ 10.0 $ 10.0        
Weighted-average useful life of acquired intangible assets     16 years 6 months            
Take Private Acquisition, Dun & Bradstreet | Star Merger Sub, Inc.                  
Business Acquisition [Line Items]                  
Transaction costs             $ 147.4   $ 13.0
Take Private Acquisition, Dun & Bradstreet | Minimum                  
Business Acquisition [Line Items]                  
Useful lives of intangible assets     8 years            
Take Private Acquisition, Dun & Bradstreet | Maximum                  
Business Acquisition [Line Items]                  
Useful lives of intangible assets     17 years