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Debt, Long-term (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Total long-term debt $ 1,239.9 $ 914.5
Less: debt maturing within one year 6.0 5.7
Total long-term debt, less current portion 1,233.9 908.8
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 598.2 598.2
Unamortized discount 1.8 1.8
2011 Credit Agreement [Member]
   
Debt Instrument [Line Items]    
Interest rate percentage 1.20%  
Debt Instrument, Maturity Year 2016  
Total long-term debt 455.0 [1] 130.0 [1]
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 2023  
Total long-term debt $ 10.0 $ 9.6
[1] Letters of credit outstanding under the 2011 Credit Agreement totaled $73.3 million and available funds under this facility were $971.7 million at March 31, 2013.