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Investments in Unconsolidated Affiliates - Narrative (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Jan. 08, 2021
Jul. 06, 2020
Jul. 01, 2019
Feb. 08, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Feb. 15, 2022
Feb. 14, 2022
Jun. 30, 2021
Schedule of Equity Method Investments [Line Items]                    
Federal statutory rate         21.00% 21.00% 21.00%      
Investment amount     $ 17.6 $ 375.0 $ 492.6          
Receivable from sale of equity investment, noncurrent           $ 1.8       $ 1.8
Proceeds from sale of investment in unconsolidated affiliate           8.4        
Equity Method Investment, Realized Gain (Loss) on Disposal           5.0        
D&B Investment                    
Schedule of Equity Method Investments [Line Items]                    
Equity interest acquired (percent)   13.00%   18.10%            
D&B Investment                    
Schedule of Equity Method Investments [Line Items]                    
Payments to acquire interest in affiliate   $ 100.0                
Shares owned by affiliates of THL immediately after each offering (shares)   54.8                
Ownership interest (percent)   13.00%                
Share price (in USD per share)         $ 20.49          
Fair value of investment         $ 1,123.9          
Equity Method Investment, Realized Gain (Loss) on Disposal           $ 5.0        
D&B Investment | Subsequent Event                    
Schedule of Equity Method Investments [Line Items]                    
Ownership interest (percent)               4.30%    
Share price (in USD per share)                 $ 19.10  
Fair value of investment               $ 352.8    
D&B Investment | Bisnode Business Information Group AB                    
Schedule of Equity Method Investments [Line Items]                    
Issuance of common stock (in shares) 6.2                  
Ownership interest (percent) 12.80%                  
D&B Investment | IPO                    
Schedule of Equity Method Investments [Line Items]                    
Issuance of common stock (in shares)   90.0                
Price per share (in USD per share)   $ 22.00                
Proceeds from Issuance Initial Public Offering   $ 2,400.0                
D&B Investment | Underwriters' Option                    
Schedule of Equity Method Investments [Line Items]                    
Issuance of common stock (in shares)   11.7                
D&B Investment | Private Placement                    
Schedule of Equity Method Investments [Line Items]                    
Proceeds from Issuance Initial Public Offering   $ 400.0