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Debt - Long-term (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Debt issuance cost $ (21.7) $ (20.2)
Total long-term debt 3,107.9 3,113.9
Less: debt maturing within one year 80.4 82.8
Total long-term debt, less current portion 3,027.5 3,031.1
Pollution Control and Industrial Revenue Bonds    
Debt Instrument [Line Items]    
Long-term debt, gross 51.7 51.6
Unamortized discount $ 0.1 0.2
Pollution Control and Industrial Revenue Bonds | Minimum    
Debt Instrument [Line Items]    
Interest Rate Percentage 0.30%  
Pollution Control and Industrial Revenue Bonds | Maximum    
Debt Instrument [Line Items]    
Interest Rate Percentage 6.50%  
Senior Notes    
Debt Instrument [Line Items]    
Long-term debt, gross $ 2,198.9 2,198.7
Unamortized discount $ 1.1 1.3
Senior Notes | Minimum    
Debt Instrument [Line Items]    
Interest Rate Percentage 3.20%  
Senior Notes | Maximum    
Debt Instrument [Line Items]    
Interest Rate Percentage 4.50%  
2017 Term Loan Facility    
Debt Instrument [Line Items]    
Interest Rate Percentage 1.40%  
Long-term debt, gross $ 800.0 800.0
Revolving Credit Facility    
Debt Instrument [Line Items]    
Interest Rate Percentage 2.80%  
Long-term debt, gross $ 0.0 0.0
Letters of credit outstanding amount 215.3  
Credit agreement, available funds 1,041.6  
Foreign debt    
Debt Instrument [Line Items]    
Long-term debt, gross $ 79.0 $ 83.8
Foreign debt | Minimum    
Debt Instrument [Line Items]    
Interest Rate Percentage 0.00%  
Foreign debt | Maximum    
Debt Instrument [Line Items]    
Interest Rate Percentage 6.10%