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Debt - Long-term (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Total long-term debt $ 1,693.5 $ 1,801.2
Debt issuance cost (14.7) (9.7)
Less: debt maturing within one year 101.2 2.4
Total long-term debt, less current portion $ 1,592.3 1,798.8
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 2032  
Unamortized discounts $ 0.2 0.2
Total long-term debt $ 51.6 51.6
Pollution control and industrial revenue bonds (less unamortized discounts of $0.2 and $0.2, respectively) | Minimum    
Debt Instrument [Line Items]    
Interest Rate Percentage 1.10%  
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 $1.2 and $1.4, respectively)    
Debt Instrument [Line Items]    
Maturity date, minimum 2019  
Maturity date, maximum 2024  
Unamortized discounts $ 1.2 1.4
Total long-term debt $ 998.8 998.6
Senior notes (less unamortized discount of $1.2 and $1.4, respectively) | Minimum    
Debt Instrument [Line Items]    
Interest Rate Percentage 3.95%  
Senior notes (less unamortized discount of $1.2 and $1.4, respectively) | Maximum    
Debt Instrument [Line Items]    
Interest Rate Percentage 5.20%  
2014 Term Loan Facility    
Debt Instrument [Line Items]    
Interest Rate Percentage 2.50%  
Maturity Date 2020  
Total long-term debt $ 550.0 750.0
2017 Term Loan Facility    
Debt Instrument [Line Items]    
Interest Rate Percentage 2.50%  
Maturity Date 2022  
Total long-term debt $ 0.0 0.0
Credit Facility    
Debt Instrument [Line Items]    
Interest Rate Percentage 3.70%  
Maturity Date 2022  
Total long-term debt $ 0.0 0.0
Letters of credit outstanding amount 135.7  
Credit Agreement, available funds $ 1,364.3  
Foreign debt    
Debt Instrument [Line Items]    
Maturity date, minimum 2018  
Maturity date, maximum 2024  
Total long-term debt $ 107.8 $ 10.7
Foreign debt | Minimum    
Debt Instrument [Line Items]    
Interest Rate Percentage 0.00%  
Foreign debt | Maximum    
Debt Instrument [Line Items]    
Interest Rate Percentage 10.80%