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Debt, Long-term (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Debt Instrument [Line Items]    
Total long-term debt $ 810.8 $ 798.6
Less: debt maturing within one year 2.9 19.5
Total long-term debt, less current portion 807.9 779.1
Pollution Control and Industrial Revenue Bonds [Member]
   
Debt Instrument [Line Items]    
Interest rate percentage, minimum 0.20%  
Interest rate percentage, maximum 6.50%  
Maturity date, minimum 2013  
Maturity date, maximum 2035  
Total long-term debt 176.7 176.7
Unamortized discount 0.2 0.2
Senior Notes [Member]
   
Debt Instrument [Line Items]    
Interest rate percentage, minimum 3.95%  
Interest rate percentage, maximum 5.20%  
Maturity date, minimum 2019  
Maturity date, maximum 2022  
Total long-term debt 598.1 597.9
Unamortized discount 1.9 2.1
2011 Credit Agreement [Member]
   
Debt Instrument [Line Items]    
Interest rate percentage 3.20%  
Debt Instrument, Maturity Year 2016  
Total long-term debt 24.0 0
Foreign Debt [Member]
   
Debt Instrument [Line Items]    
Interest rate percentage, minimum 0.00%  
Interest rate percentage, maximum 10.30%  
Maturity date, minimum 2013  
Maturity date, maximum 2020  
Total long-term debt $ 12.0 $ 24.0