The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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Gross amount of long-lived 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, furniture and fixtures, and computer equipment.

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- Definition

Amount, net of accumulated depreciation, depletion and amortization, of long-lived 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, furniture and fixtures, and computer equipment.

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Property, Plant and Equipment (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, plant and equipment
Property, plant and equipment, at cost	$ 515.0	$ 491.0
Accumulated depreciation	(291.4)	(267.9)
Property, plant and equipment, net	223.6	223.1	197.5
Land
Property, plant and equipment
Property, plant and equipment, at cost	15.8	15.6
Buildings and improvements
Property, plant and equipment
Property, plant and equipment, at cost	156.4	151.4
Machinery and equipment
Property, plant and equipment
Property, plant and equipment, at cost	327.3	316.5
Construction in progress
Property, plant and equipment
Property, plant and equipment, at cost	$ 15.5	$ 7.5