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Debt - Long-term (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Debt issuance cost $ (8.3) $ (8.9)
Total long-term debt 2,530.6 2,531.0
Less: debt maturing within one year 385.6 386.0
Total long-term debt, less current portion 2,145.0 2,145.0
Pollution control and industrial revenue bonds (less unamortized discounts of $0.2 and $0.2, respectively)    
Debt Instrument [Line Items]    
Long-term debt, gross 51.6 51.6
Unamortized discounts $ 0.2 0.2
Pollution control and industrial revenue bonds (less unamortized discounts of $0.2 and $0.2, respectively) | Minimum    
Debt Instrument [Line Items]    
Interest Rate Percentage 1.70%  
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 $0.7 and $0.8, respectively)    
Debt Instrument [Line Items]    
Long-term debt, gross $ 999.3 999.2
Unamortized discounts $ 0.7 0.8
Senior notes (less unamortized discount of $0.7 and $0.8, respectively) | Minimum    
Debt Instrument [Line Items]    
Interest Rate Percentage 3.95%  
Senior notes (less unamortized discount of $0.7 and $0.8, respectively) | Maximum    
Debt Instrument [Line Items]    
Interest Rate Percentage 5.20%  
2017 Term Loan Facility    
Debt Instrument [Line Items]    
Interest Rate Percentage 3.70%  
Long-term debt, gross $ 1,400.0 1,400.0
Revolving Credit Facility    
Debt Instrument [Line Items]    
Interest Rate Percentage 5.10%  
Long-term debt, gross $ 0.0 0.0
Letters of credit outstanding amount 192.1  
Credit Agreement, available funds 814.3  
Foreign debt    
Debt Instrument [Line Items]    
Long-term debt, gross $ 88.0 $ 89.1
Foreign debt | Minimum    
Debt Instrument [Line Items]    
Interest Rate Percentage 0.00%  
Foreign debt | Maximum    
Debt Instrument [Line Items]    
Interest Rate Percentage 7.20%