Property, Plant and Equipment (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Summary of property, plant and equipment
Property, plant and equipment, Gross	$ 146.2	$ 133.7
Less accumulated depreciation	(96.4)	(87.8)
Property, plant and equipment, Net	49.8	45.9
Land [Member]
Summary of property, plant and equipment
Property, plant and equipment, Gross	7.2	7.1
Buildings [Member]
Summary of property, plant and equipment
Property, plant and equipment, Gross	6.5	5.1
Equipment [Member]
Summary of property, plant and equipment
Property, plant and equipment, Gross	129.0	113.3
Work in progress [Member]
Summary of property, plant and equipment
Property, plant and equipment, Gross	$ 3.5	$ 8.2

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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