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Note 9 - Fixed Assets - Summary of Fixed Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Cost $ 1,596.6 $ 1,392.4
Accumulated Depreciation and Amortization (991.7) (850.9)
Net 604.9 541.5
Furniture and Office Equipment [Member]    
Cost 178.5 199.2
Accumulated Depreciation and Amortization (156.7) (177.1)
Net $ 21.8 $ 22.1
Furniture and Office Equipment [Member] | Minimum [Member]    
Useful Life (Year) 3 years 3 years
Furniture and Office Equipment [Member] | Maximum [Member]    
Useful Life (Year) 10 years 10 years
Leasehold Improvements [Member]    
Cost $ 116.5 $ 118.3
Accumulated Depreciation and Amortization (63.0) (54.6)
Net $ 53.5 $ 63.7
Purchased Software [Member]    
Useful Life (Year) 3 years 3 years
Cost $ 59.9 $ 65.1
Accumulated Depreciation and Amortization (55.2) (61.0)
Net 4.7 4.1
Software Development [Member]    
Cost 1,136.6 945.4
Accumulated Depreciation and Amortization (653.0) (504.5)
Net $ 483.6 $ 440.9
Software Development [Member] | Minimum [Member]    
Useful Life (Year) 3 years 3 years
Software Development [Member] | Maximum [Member]    
Useful Life (Year) 7 years 7 years
Leased Equipment [Member]    
Cost $ 105.1 $ 64.4
Accumulated Depreciation and Amortization (63.8) (53.7)
Net $ 41.3 $ 10.7
Leased Equipment [Member] | Minimum [Member]    
Useful Life (Year) 3 years 3 years
Leased Equipment [Member] | Maximum [Member]    
Useful Life (Year) 4 years 4 years