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PROPERTY AND EQUIPMENT. (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,816.8	$ 1,675.2
Less accumulated depreciation and amortization	1,142.4	1,013.9
Total	674.4	661.3
Computer and communications software and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	963.8	864.7
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	466.1	454.5
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	157.3	137.0
Furniture and other equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	193.5	178.9
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	33.4	37.4
Leased land
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
Property, Plant and Equipment [Line Items]
Property and equipment, additions	$ 95.5	$ 85.5	$ 62.3

X

- Definition

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

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