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Debt - Long-term (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Total long-term debt $ 1,991.3 $ 2,037.8
Debt issuance cost (11.5) (11.9)
Less: debt maturing within one year 2.4 1.5
Total long-term debt, less current portion $ 1,988.9 2,036.3
Pollution control and industrial revenue bonds (less unamortized discounts of $0.2 and $0.2, respectively)    
Debt Instrument [Line Items]    
Maturity date, minimum 2021  
Maturity date, maximum 2035  
Unamortized discounts $ 0.2 0.2
Total long-term debt $ 141.6 141.5
Senior notes (less unamortized discount of $1.5 and $1.7, respectively)    
Debt Instrument [Line Items]    
Maturity date, minimum 2019  
Maturity date, maximum 2024  
Unamortized discounts $ 1.6 1.7
Total long-term debt $ 998.5 998.3
Term Loan Facility    
Debt Instrument [Line Items]    
Interest Rate Percentage 1.80%  
Maturity Date 2020  
Total long-term debt $ 850.0 900.0
Credit Facility    
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 59.2  
Credit Agreement, available funds $ 1,440.8  
Foreign Debt    
Debt Instrument [Line Items]    
Maturity date, minimum 2016  
Maturity date, maximum 2024  
Total long-term debt $ 12.7 $ 9.9
Minimum | Pollution control and industrial revenue bonds (less unamortized discounts of $0.2 and $0.2, respectively)    
Debt Instrument [Line Items]    
Interest Rate Percentage 0.60%  
Minimum | Senior notes (less unamortized discount of $1.5 and $1.7, respectively)    
Debt Instrument [Line Items]    
Interest Rate Percentage 3.95%  
Minimum | Foreign Debt    
Debt Instrument [Line Items]    
Interest Rate Percentage 0.00%  
Maximum | Pollution control and industrial revenue bonds (less unamortized discounts of $0.2 and $0.2, respectively)    
Debt Instrument [Line Items]    
Interest Rate Percentage 6.50%  
Maximum | Senior notes (less unamortized discount of $1.5 and $1.7, respectively)    
Debt Instrument [Line Items]    
Interest Rate Percentage 5.20%  
Maximum | Foreign Debt    
Debt Instrument [Line Items]    
Interest Rate Percentage 9.30%  
[1] Letters of credit outstanding under our Credit Facility totaled $59.2 million and available funds under this facility were $1,440.8 million at June 30, 2016, which reflects borrowings under our commercial paper program.