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Property, Plant and Equipment (Textuals) (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 $ 72.8 $ 71.1 $ 68.8
Accumulated depreciation, capitalized leases 1.6 1.1  
Capital leases, future minimum payments due, 2013 0.3    
Capital leases, future minimum payments due, 2014 0.2    
Capital leases, future minimum payments due, 2015 0.2    
Accrued construction and development costs 35.3    
Capitalized interest 1.9 1.1 0.9
Buildings and Improvements [Member]
     
Property, Plant and Equipment [Line Items]      
Capitalized leases 2.4 2.3  
Machinery and Equipment [Member]
     
Property, Plant and Equipment [Line Items]      
Capitalized leases $ 1.8 $ 1.9