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Note 9 - Fixed Assets (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Depreciation, Depletion and Amortization, Nonproduction, Total $ 206.9 $ 192.2 $ 185.7
Capitalized Computer Software, Amortization 137.5 120.6 100.2
Unamortized Costs Capitalized 59.4 53.5  
Asset Impairment Charges, Total 134.0 0.0 0.0
Financial Services Segment [Member]      
Asset Impairment Charges, Total 134.0    
Software and Software Development Costs [Member]      
Depreciation, Depletion and Amortization, Nonproduction, Total 11.7 11.3 $ 12.8
Unamortized Costs Capitalized 433.5 $ 405.8  
Software Development [Member] | Financial Services Segment [Member]      
Asset Impairment Charges, Total $ 45.8