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Property, Plant and Equipment (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Property, Plant and Equipment [Line Items]      
Depreciation $ 99.1 $ 101.1 $ 109.4
Property, plant and equipment:      
Land and land improvements 160.8 143.1  
Mineral rights 31.4 31.4  
Buildings 377.1 363.9  
Machinery and equipment 2,250.3 2,150.3  
Construction in progress 217.8 161.3  
Total cost 3,037.4 2,850.0  
Accumulated depreciation 1,901.2 1,863.2  
Property, plant and equipment, net $ 1,136.2 $ 986.8