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PROPERTY AND EQUIPMENT. (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,970.3	$ 1,816.8
Less accumulated depreciation and amortization	1,274.9	1,142.4
Total	695.4	674.4
Computer and communications software and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,113.1	963.8
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	457.5	466.1
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	169.2	157.3
Furniture and other equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	193.3	193.5
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	37.2	33.4
Leased land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	0.0	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	$ 125.9	$ 95.5	$ 85.5

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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