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Debt - Long-term (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Total long-term debt $ 1,915.7 $ 2,037.8
Debt issuance cost (10.8) (11.9)
Less: debt maturing within one year 2.4 1.5
Total long-term debt, less current portion $ 1,913.3 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 $ 141.5 141.5
Pollution control and industrial revenue bonds (less unamortized discounts of $0.2 and $0.2 respectively) | Minimum    
Debt Instrument [Line Items]    
Interest Rate Percentage 1.00%  
Pollution control and industrial revenue bonds (less unamortized discounts of $0.2 and $0.2 respectively) | Maximum    
Debt Instrument [Line Items]    
Interest Rate Percentage 6.50%  
Senior notes (less unamortized discount of $1.4 and $1.7 respectively)    
Debt Instrument [Line Items]    
Maturity date, minimum 2019  
Maturity date, maximum 2024  
Unamortized discounts $ 1.4 1.7
Total long-term debt $ 998.6 998.3
Senior notes (less unamortized discount of $1.4 and $1.7 respectively) | Minimum    
Debt Instrument [Line Items]    
Interest Rate Percentage 3.95%  
Senior notes (less unamortized discount of $1.4 and $1.7 respectively) | Maximum    
Debt Instrument [Line Items]    
Interest Rate Percentage 5.20%  
Term Loan Facility    
Debt Instrument [Line Items]    
Interest Rate Percentage 1.90%  
Maturity Date 2020  
Total long-term debt $ 775.0 900.0
Credit Facility    
Debt Instrument [Line Items]    
Interest Rate Percentage 3.00%  
Maturity Date 2019  
Total long-term debt [1] $ 0.0 0.0
Letters of credit outstanding amount 116.7  
Credit Agreement, available funds $ 1,383.3  
Foreign debt    
Debt Instrument [Line Items]    
Maturity date, minimum 2016  
Maturity date, maximum 2024  
Total long-term debt $ 11.4 $ 9.9
Foreign debt | Minimum    
Debt Instrument [Line Items]    
Interest Rate Percentage 0.00%  
Foreign debt | Maximum    
Debt Instrument [Line Items]    
Interest Rate Percentage 9.30%  
[1] Letters of credit outstanding under our Credit Facility totaled $116.7 million and available funds under this facility were $1,383.3 million at September 30, 2016.