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Debt - Long-term (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Debt issuance cost $ (18.2) $ (19.8)
Total long-term debt 3,016.5 3,023.1
Less: debt maturing within one year 385.1 93.6
Total long-term debt, less current portion 2,631.4 2,929.5
Pollution Control and Industrial Revenue Bonds    
Debt Instrument [Line Items]    
Unamortized discount 0.1 0.1
Long-term debt, gross $ 51.6 51.6
Pollution Control and Industrial Revenue Bonds | Minimum    
Debt Instrument [Line Items]    
Interest Rate Percentage 0.25%  
Pollution Control and Industrial Revenue Bonds | Maximum    
Debt Instrument [Line Items]    
Interest Rate Percentage 6.45%  
Senior Notes    
Debt Instrument [Line Items]    
Unamortized discount $ 0.9 1.0
Long-term debt, gross $ 2,199.1 2,199.0
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 1.36%  
Long-term debt, gross $ 700.0 700.0
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 215.7  
Credit agreement, available funds 797.3  
Foreign debt    
Debt Instrument [Line Items]    
Long-term debt, gross $ 84.0 $ 92.3
Foreign debt | Minimum    
Debt Instrument [Line Items]    
Interest Rate Percentage 0.00%  
Foreign debt | Maximum    
Debt Instrument [Line Items]    
Interest Rate Percentage 6.10%