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Take-Private Transaction - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
11 Months Ended 12 Months Ended
Feb. 08, 2019
Jun. 19, 2018
Dec. 31, 2019
Dec. 31, 2021
Dec. 31, 2019
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              
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]                
Amortization life (years)       8 years        
Take-Private Acquisition, Dun & Bradstreet | Maximum                
Business Acquisition [Line Items]                
Amortization life (years)       17 years