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Debt - Long-term (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]      
Debt issuance cost $ (20.8)   $ (20.2)
Total long-term debt 3,106.2   3,113.9
Less: debt maturing within one year 77.9   82.8
Total long-term debt, less current portion 3,028.3   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 215.2    
Credit agreement, available funds 1,284.8    
Foreign debt      
Debt Instrument [Line Items]      
Long-term debt, gross $ 76.4   $ 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%