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Fixed Assets and Lease Commitments (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Fixed assets
Fixed assets, at cost	$ 250.7	$ 247.3
Accumulated depreciation and amortization	(146.4)	(136.3)
Fixed assets (net)	104.3	111.0	$ 110.1
Building and leasehold improvements
Fixed assets
Fixed assets, at cost	117.8	111.9
Software
Fixed assets
Fixed assets, at cost	51.0	50.8
Equipment
Fixed assets
Fixed assets, at cost	42.3	44.5
Furniture and fixtures
Fixed assets
Fixed assets, at cost	21.0	21.4
Land, improvements and other
Fixed assets
Fixed assets, at cost	$ 18.6	$ 18.7

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- 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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