PROPERTY, EQUIPMENT AND SOFTWARE - Schedule of Property, Plant and Software (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2,838.5	$ 2,482.4
Less accumulated depreciation and amortization	1,861.5	1,675.8
Total	977.0	806.6
Computer and communications software and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,680.3	1,497.3
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	493.2	490.7
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	414.0	260.9
Furniture and other equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	225.3	207.8
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 25.7	$ 25.7

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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