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Property, Plant And Equipment (Components Of Property, Plant And Equipment) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Property, Plant And Equipment [Abstract]    
Land $ 25.6 $ 26.0
Buildings and improvements 224.5 229.0
Machinery and equipment 479.4 481.9
Office equipment and other assets 31.3 31.0
Software 91.4 54.2
Mineral rights 0.7 1.6
Construction in progress 57.6 39.5
Gross Property, Plant and Equipment 910.5 863.2
Less accumulated depreciation and amortization 404.5 394.9
Net Property, Plant and Equipment $ 506.0 $ 468.3