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Note 9 - Fixed Assets - Summary of Fixed Assets (Details) - USD ($)
$ in Millions
12 Months Ended 24 Months Ended
Dec. 31, 2020
Dec. 31, 2021
Cost $ 1,469.3 $ 1,631.1
Accumulated Depreciation and Amortization (837.0) (972.9)
Net 632.3 658.2
Furniture and Office Equipment [Member]    
Cost 273.6 259.2
Accumulated Depreciation and Amortization (215.8) (219.6)
Net $ 57.8 $ 39.6
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 $ 118.3 $ 135.7
Accumulated Depreciation and Amortization (44.7) (54.5)
Net $ 73.6 $ 81.2
Purchased Software [Member]    
Useful Life (Year) 3 years 3 years
Cost $ 77.7 $ 92.1
Accumulated Depreciation and Amortization (68.6) (71.1)
Net 9.1 21.0
Software Development [Member]    
Cost 924.6 1,077.4
Accumulated Depreciation and Amortization (465.3) (584.5)
Net $ 459.3 $ 492.9
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 $ 68.3 $ 60.5
Accumulated Depreciation and Amortization (41.2) (41.5)
Net $ 27.1 $ 19.0
Leased Equipment [Member] | Minimum [Member]    
Useful Life (Year) 3 years 3 years
Leased Equipment [Member] | Maximum [Member]    
Useful Life (Year) 4 years 4 years
Motor Vehicles and Field Equipment [Member]    
Cost $ 6.8 $ 6.2
Accumulated Depreciation and Amortization (1.4) (1.7)
Net $ 5.4 $ 4.5
Motor Vehicles and Field Equipment [Member] | Minimum [Member]    
Useful Life (Year) 2 years 2 years
Motor Vehicles and Field Equipment [Member] | Maximum [Member]    
Useful Life (Year) 10 years 10 years