Property, Plant and Equipment (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Property, Plant and Equipment
Property, plant and equipment, gross	$ 1,141.5	$ 1,076.3
Accumulated depreciation	(577.4)	(541.3)
Property, plant and equipment, net, associated with assets held for sale	(3.8)	(1.6)
Property, plant and equipment, net	560.3	533.4
Capitalized interest	1.3	1.7	0.8
Land
Property, Plant and Equipment
Property, plant and equipment, gross	36.5	33.5
Buildings and leasehold improvements
Property, Plant and Equipment
Property, plant and equipment, gross	276.3	274.3
Machinery and equipment
Property, Plant and Equipment
Property, plant and equipment, gross	790.1	730.5
Projects in progress
Property, Plant and Equipment
Property, plant and equipment, gross	$ 38.6	$ 38.0

Gross amount, at the balance sheet date, of long-lived physical assets used in the normal conduct of business and not intended for resale. This can include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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