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Note 12 - Goodwill and Intangible Assets - Intangible Assets and Related Accumulated Amortization (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Cost $ 2,355.1 $ 2,345.1  
Accumulated amortization (1,129.2) (960.3)  
Net $ 1,225.9 $ 1,384.8  
Technology-Based Intangible Assets [Member]      
Weighted average useful life (Year) 7 years 7 years  
Cost $ 576.4   $ 559.6
Accumulated amortization (403.3) $ (349.5)  
Net $ 173.1 $ 210.1  
Marketing-Related Intangible Assets [Member]      
Weighted average useful life (Year) 15 years 16 years  
Cost $ 274.1 $ 275.2  
Accumulated amortization (129.6) (113.4)  
Net $ 144.5 $ 161.8  
Contract-Based Intangible Assets [Member]      
Weighted average useful life (Year) 6 years 6 years  
Cost $ 5.0 $ 5.0  
Accumulated amortization (5.0) (5.0)  
Net $ 0.0 $ 0.0  
Customer-Related Intangible Assets [Member]      
Weighted average useful life (Year) 13 years 13 years  
Cost $ 1,015.4 $ 1,004.3  
Accumulated amortization (426.5) (354.2)  
Net $ 588.9 $ 650.1  
Database [Member]      
Weighted average useful life (Year) 18 years 19 years  
Cost $ 484.2 $ 501.0  
Accumulated amortization (164.8) (138.2)  
Net $ 319.4 $ 362.8