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Note 10 - Acquisitions - Amounts Assigned to Intangible Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
The 2021 Acquisitions [Member]      
Total intangible assets $ 115.7    
The 2021 Acquisitions [Member] | Technology-Based Intangible Assets [Member]      
Weighted average useful life (Year) 5 years    
Total intangible assets $ 21.2    
The 2021 Acquisitions [Member] | Marketing-Related Intangible Assets [Member]      
Weighted average useful life (Year) 4 years    
Total intangible assets $ 1.4    
The 2021 Acquisitions [Member] | Customer-Related Intangible Assets [Member]      
Weighted average useful life (Year) 13 years    
Total intangible assets $ 84.7    
The 2021 Acquisitions [Member] | Database [Member]      
Weighted average useful life (Year) 5 years    
Total intangible assets $ 8.4    
2020 Acquisitions [Member]      
Total intangible assets   $ 123.4  
2020 Acquisitions [Member] | Technology-Based Intangible Assets [Member]      
Weighted average useful life (Year)   11 years  
Total intangible assets   $ 30.8  
2020 Acquisitions [Member] | Marketing-Related Intangible Assets [Member]      
Weighted average useful life (Year)   5 years  
Total intangible assets   $ 2.1  
2020 Acquisitions [Member] | Customer-Related Intangible Assets [Member]      
Weighted average useful life (Year)   11 years  
Total intangible assets   $ 90.5  
2019 Acquisitions [Member]      
Total intangible assets     $ 292.0
2019 Acquisitions [Member] | Technology-Based Intangible Assets [Member]      
Weighted average useful life (Year)     6 years
Total intangible assets     $ 81.9
2019 Acquisitions [Member] | Marketing-Related Intangible Assets [Member]      
Weighted average useful life (Year)     4 years
Total intangible assets     $ 3.9
2019 Acquisitions [Member] | Customer-Related Intangible Assets [Member]      
Weighted average useful life (Year)     12 years
Total intangible assets     $ 185.5
2019 Acquisitions [Member] | Database [Member]      
Weighted average useful life (Year)     10 years
Total intangible assets     $ 20.7