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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Property, Plant and Equipment (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Property, plant and equipment
Property, plant and equipment, at cost	$ 608.8	$ 608.6
Accumulated depreciation	(408.1)	(396.3)
Property, plant and equipment, net	200.7	212.3	$ 200.0
Land
Property, plant and equipment
Property, plant and equipment, at cost	12.6	13.2
Buildings and improvements
Property, plant and equipment
Property, plant and equipment, at cost	190.6	194.3
Machinery and equipment
Property, plant and equipment
Property, plant and equipment, at cost	394.5	386.6
Construction in progress
Property, plant and equipment
Property, plant and equipment, at cost	$ 11.1	$ 14.5