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PROPERTY, EQUIPMENT AND SOFTWARE - Schedule of Property, Plant and Software (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2,482.4	$ 2,325.2
Less accumulated depreciation and amortization	1,675.8	1,569.5
Total	806.6	755.7
Computer and communications software and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,497.3	1,364.6
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	490.7	488.9
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	260.9	236.3
Furniture and other equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	207.8	209.7
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 25.7	$ 25.7

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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Amount before accumulated depreciation, depletion and amortization of 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, and furniture and fixtures.

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