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Note 8 - Goodwill and Intangible Assets - Intangible Assets and Related Accumulated Amortization (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Cost $ 1,993.8 $ 2,355.1
Accumulated amortization (903.3) (1,129.2)
Net $ 1,090.5 $ 1,225.9
Technology-Based Intangible Assets [Member]    
Weighted average useful life (Year) 7 years 7 years
Cost $ 527.1 $ 576.4
Accumulated amortization (362.4) (403.3)
Net $ 164.7 $ 173.1
Marketing-Related Intangible Assets [Member]    
Weighted average useful life (Year) 15 years 15 years
Cost $ 213.2 $ 274.1
Accumulated amortization (101.9) (129.6)
Net $ 111.3 $ 144.5
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 $ 879.1 $ 1,015.4
Accumulated amortization (297.2) (426.5)
Net $ 581.9 $ 588.9
Database [Member]    
Weighted average useful life (Year) 18 years 18 years
Cost $ 369.4 $ 484.2
Accumulated amortization (136.8) (164.8)
Net $ 232.6 $ 319.4