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Debt - Long-term (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Total long-term debt $ 3,023.1 $ 3,113.9
Debt issuance cost (19.8) (20.2)
Less: debt maturing within one year 93.6 82.8
Total long-term debt, less current portion 2,929.5 3,031.1
Pollution Control and Industrial Revenue Bonds    
Debt Instrument [Line Items]    
Unamortized discount 0.1 0.2
Total long-term debt 51.6 51.6
Senior Notes    
Debt Instrument [Line Items]    
Unamortized discount 1.0 1.3
Total long-term debt $ 2,199.0 2,198.7
2017 Term Loan Facility    
Debt Instrument [Line Items]    
Interest rate percentage 1.40%  
Long-term debt, gross $ 700.0 800.0
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 214.1  
Line of credit, remaining borrowing capacity 1,139.6  
Foreign debt    
Debt Instrument [Line Items]    
Total long-term debt $ 92.3 $ 83.8
Minimum | Pollution Control and Industrial Revenue Bonds    
Debt Instrument [Line Items]    
Interest rate percentage 0.30%  
Minimum | Senior Notes    
Debt Instrument [Line Items]    
Interest rate percentage 3.20%  
Minimum | Foreign debt    
Debt Instrument [Line Items]    
Interest rate percentage 0.00%  
Maximum | Pollution Control and Industrial Revenue Bonds    
Debt Instrument [Line Items]    
Interest rate percentage 6.50%  
Maximum | Senior Notes    
Debt Instrument [Line Items]    
Interest rate percentage 4.50%  
Maximum | Foreign debt    
Debt Instrument [Line Items]    
Interest rate percentage 6.10%