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Property (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Property, gross	$ 1,342.6	$ 1,600.7
Less accumulated depreciation and amortization	(933.1)	(1,145.2)
Property, net	409.5	455.5
Software and software development costs
Property, Plant and Equipment [Line Items]
Property, gross	654.9	692.4
Furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Property, gross	413.3	551.3
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, gross	143.7	224.8
Building and building improvements
Property, Plant and Equipment [Line Items]
Property, gross	$ 130.7	$ 132.2
Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life, minimum	2 years
Minimum [Member] | Software and software development costs
Property, Plant and Equipment [Line Items]
Estimated useful life, minimum	2 years
Minimum [Member] | Furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Estimated useful life, minimum	2 years
Minimum [Member] | Leasehold improvements
Property, Plant and Equipment [Line Items]
Estimated useful life, minimum	3 years
Minimum [Member] | Building and building improvements
Property, Plant and Equipment [Line Items]
Estimated useful life, minimum	1 year
Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life, minimum	20 years
Maximum [Member] | Software and software development costs
Property, Plant and Equipment [Line Items]
Estimated useful life, minimum	4 years
Maximum [Member] | Furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Estimated useful life, minimum	7 years
Maximum [Member] | Leasehold improvements
Property, Plant and Equipment [Line Items]
Estimated useful life, minimum	19 years
Maximum [Member] | Building and building improvements
Property, Plant and Equipment [Line Items]
Estimated useful life, minimum	10 years

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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