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Debt - Long-term (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Total long-term debt $ 1,988.0 $ 2,037.8
Debt issuance cost (12.1) (11.9)
Less: debt maturing within one year 1.8 1.5
Total long-term debt, less current portion $ 1,986.2 2,036.3
Pollution Control and Industrial Revenue Bonds [Member]    
Debt Instrument [Line Items]    
Interest rate percentage, minimum 0.60%  
Interest rate percentage, maximum 6.50%  
Maturity date, minimum 2021  
Maturity date, maximum 2035  
Unamortized discounts $ 0.2 0.2
Total long-term debt $ 141.5 141.5
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  
Unamortized discounts $ 1.6 1.7
Total long-term debt $ 998.4 998.3
Term Loan Facility [Member]    
Debt Instrument [Line Items]    
Interest Rate Percentage 1.80%  
Maturity Date 2020  
Total long-term debt $ 850.0 900.0
Credit Facility [Member]    
Debt Instrument [Line Items]    
Interest Rate Percentage 2.90%  
Maturity Date 2019  
Total long-term debt [1] $ 0.0 0.0
Letters of credit outstanding amount 53.6  
Credit Agreement, available funds $ 1,410.7  
Foreign Debt [Member]    
Debt Instrument [Line Items]    
Interest rate percentage, minimum 0.00%  
Interest rate percentage, maximum 9.30%  
Maturity date, minimum 2016  
Maturity date, maximum 2024  
Total long-term debt $ 10.2 $ 9.9
[1] Letters of credit outstanding under our Credit Facility totaled $53.6 million and available funds under this facility were $1,410.7 million at March 31, 2016, which reflects borrowings under our commercial paper program.