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Property (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property, gross	$ 1,544.8	$ 1,540.4
Less accumulated depreciation and amortization	(1,039.5)	(961.2)
Property, net	505.3	579.2
Proceeds from the sale of building property	39.3	0.0	$ 0.0
Gain (Loss) on Sale of Properties	30.4
Software and software development costs
Property, Plant and Equipment [Line Items]
Property, gross	661.1	647.2
Furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Property, gross	519.1	492.9
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, gross	232.3	225.5
Building and building improvements
Property, Plant and Equipment [Line Items]
Property, gross	132.3	167.1
Land and land improvements
Property, Plant and Equipment [Line Items]
Property, gross	$ 0.0	$ 7.7
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
Minimum [Member] | Land and land improvements
Property, Plant and Equipment [Line Items]
Estimated useful life, minimum	10 years
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
Maximum [Member] | Land and land improvements
Property, Plant and Equipment [Line Items]
Estimated useful life, minimum	20 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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