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Note 9 - Fixed Assets - Summary of Fixed Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Cost | $ 1,469.3 | $ 1,280.0
Accumulated Depreciation and Amortization | (837.0) | (731.9)
Net | 632.3 | 548.1
Furniture and Office Equipment [Member] |  |
Cost | 273.6 | 268.9
Accumulated Depreciation and Amortization | (215.8) | (210.1)
Net | $ 57.8 | $ 58.8
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 | $ 103.9
Accumulated Depreciation and Amortization | (44.7) | (41.7)
Net | $ 73.6 | $ 62.2
Purchased Software [Member] |  |
Useful Life (Year) | 3 years | 3 years
Cost | $ 77.7 | $ 89.8
Accumulated Depreciation and Amortization | (68.6) | (77.7)
Net | 9.1 | 12.1
Software Development [Member] |  |
Cost | 924.6 | 773.7
Accumulated Depreciation and Amortization | (465.3) | (373.7)
Net | $ 459.3 | $ 400.0
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 | $ 38.5
Accumulated Depreciation and Amortization | (41.2) | (28.6)
Net | $ 27.1 | $ 9.9
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 |
Accumulated Depreciation and Amortization | (1.4) |
Net | $ 5.4 |
Motor Vehicles and Field Equipment [Member] | Minimum [Member] |  |
Useful Life (Year) | 2 years |
Motor Vehicles and Field Equipment [Member] | Maximum [Member] |  |
Useful Life (Year) | 10 years |
Aircraft Equipment [Member] |  |
Cost |  | $ 5.2
Accumulated Depreciation and Amortization |  | (0.1)
Net |  | $ 5.1
Aircraft Equipment [Member] | Minimum [Member] |  |
Useful Life (Year) |  | 2 years
Aircraft Equipment [Member] | Maximum [Member] |  |
Useful Life (Year) |  | 10 years

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