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Debt, Long-term (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Total long-term debt $ 1,188.8 $ 1,188.8
Less: debt maturing within one year 34.8 34.7
Total long-term debt, less current portion 1,154.0 1,154.1
Pollution Control and Industrial Revenue Bonds [Member]
   
Debt Instrument [Line Items]    
Interest rate percentage, minimum 0.10%  
Interest rate percentage, maximum 6.50%  
Maturity date, minimum 2014  
Maturity date, maximum 2035  
Total long-term debt 174.0 174.0
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 2024  
Total long-term debt 997.8 997.8
Unamortized discount 2.2 2.2
Revolving Credit Facility [Member]
   
Debt Instrument [Line Items]    
Interest rate percentage 2.40%  
Debt Instrument, Maturity Year 2017  
Total long-term debt 0 [1] 0 [1]
Foreign Debt [Member]
   
Debt Instrument [Line Items]    
Interest rate percentage, minimum 0.00%  
Interest rate percentage, maximum 9.30%  
Maturity date, minimum 2014  
Maturity date, maximum 2024  
Total long-term debt $ 17.0 $ 17.0
[1] Letters of credit outstanding under our Credit Facility totaled $73.1 million and available funds under this facility were $821.0 million at March 31, 2014 (which reflects borrowings under our commercial paper program).