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Fixed Assets (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	$ 239.2	$ 255.1
Accumulated depreciation and amortization	(165.3)	(175.5)
Fixed assets (net)	73.9	79.6
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	113.4	116.5
Software
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	56.1	55.3
Equipment
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	30.6	44.3
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	18.9	21.0
Land, improvements and other
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	$ 20.2	$ 18.0

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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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