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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

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

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+ References

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