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PROPERTY AND EQUIPMENT. (Owned) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,675.2	$ 1,596.9
Less accumulated depreciation and amortization	1,013.9	944.9
Total	661.3	652.0
Computer and communications software and equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	864.7	824.4
Buildings and improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	454.5	442.5
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	137.0	121.0
Furniture and other equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	178.9	168.9
Land [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	37.4	37.4
Leased land [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2.7	2.7
Compensation and related costs attributable to the development of computer software for internal use [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, additions	$ 85.5	$ 62.3	$ 28.9

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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-Publisher FASB
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-SubTopic 10
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Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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