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Acquisitions - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended 19 Months Ended
Nov. 15, 2021
Nov. 05, 2021
Jan. 08, 2021
Sep. 11, 2020
Mar. 11, 2020
Jan. 07, 2020
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Jun. 15, 2023
Mar. 31, 2021
Business Acquisition [Line Items]                      
Transaction costs             $ 23.4 $ 14.1 $ 14.1    
Transaction costs                 $ 0.2    
Reacquired right                      
Business Acquisition [Line Items]                      
Weighted average amortization period (years)             15 years        
Eyeota                      
Business Acquisition [Line Items]                      
Ownership interest acquired (as a percent)   100.00%                  
Consideration transferred   $ 172.4                  
Net working capital adjustment   $ 0.1                  
Transaction costs               3.0      
Weighted average amortization period (years)             10 years 1 month 6 days        
Net increase of goodwill             $ 0.2        
Eyeota | Maximum                      
Business Acquisition [Line Items]                      
Amortization life (years)             14 years        
Eyeota | Minimum                      
Business Acquisition [Line Items]                      
Amortization life (years)             2 years        
NetWise                      
Business Acquisition [Line Items]                      
Ownership interest acquired (as a percent)   100.00%                  
Consideration transferred $ 69.8                    
Net working capital adjustment             $ 0.4        
Transaction costs             $ 0.4        
Weighted average amortization period (years)             13 years 2 months 12 days        
Net increase of goodwill             $ 3.6        
Payments to acquire business $ 62.9                    
Payment due 19 months                    
NetWise | Forecast                      
Business Acquisition [Line Items]                      
Payments to acquire business                   $ 6.9  
NetWise | Maximum                      
Business Acquisition [Line Items]                      
Amortization life (years)             15 years        
NetWise | Minimum                      
Business Acquisition [Line Items]                      
Amortization life (years)             2 years        
Bisnode                      
Business Acquisition [Line Items]                      
Ownership interest acquired (as a percent)     100.00%                
Consideration transferred     $ 805.8                
Weighted average amortization period (years)     13 years 7 months 6 days                
Payments to acquire business     $ 646.9                
Stock issued in acquisition (shares)     6,237,087                
Cash consideration transferred from issuance of common and preferred shares     $ 158.9                
Increase in goodwill during period               7.0      
Bisnode | Term Loan Due 2026                      
Business Acquisition [Line Items]                      
Proceeds from borrowings on lines of credit     $ 300.0                
Bisnode | Maximum                      
Business Acquisition [Line Items]                      
Weighted average amortization period (years)     15 years                
Bisnode | Minimum                      
Business Acquisition [Line Items]                      
Weighted average amortization period (years)     6 years                
Bisnode | Customer Relationships Reclassed to Reacquired Right                      
Business Acquisition [Line Items]                      
Intangible assets:     $ 64.7                
Bisnode | Reacquired right                      
Business Acquisition [Line Items]                      
Amortization life (years)     15 years                
Weighted average amortization period (years)     15 years                
Intangible assets:               $ 270.0     $ 271.0
Orb                      
Business Acquisition [Line Items]                      
Ownership interest acquired (as a percent)           100.00%          
Consideration transferred           $ 11.6          
coAction.com                      
Business Acquisition [Line Items]                      
Consideration transferred         $ 9.6            
Payments to acquire business       $ 4.8 $ 4.8