Net Property, Plant and Equipment (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Net Property, Plant and Equipment
Property, plant and equipment	$ 1,223.5	$ 1,063.9
Less accumulated depreciation	(501.4)	(465.6)
Net property, plant and equipment	722.1	598.3
Depreciation expense related to property, plant and equipment	55.3	53.2	46.6
Capitalized costs associated with software developed for internal use	1.1	1.1
Land
Net Property, Plant and Equipment
Property, plant and equipment	35.4	34.4
Buildings
Net Property, Plant and Equipment
Property, plant and equipment	278.7	253.1
Equipment
Net Property, Plant and Equipment
Property, plant and equipment	732.0	680.9
Construction in progress
Net Property, Plant and Equipment
Property, plant and equipment	177.4	95.5
Capitalized interest	$ 2.0	$ 2.5