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Debt - Schedule of Long-Term Debt (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Debt Instrument [Line Items]    
Debt issuance cost $ (28.4) $ (20.4)
Total long-term debt 3,356.0 3,104.0
Less: debt maturing within one year 86.0 76.1
Total long-term debt, less current portion 3,270.0 3,027.9
Pollution control and industrial revenue bonds (less unamortized discounts of $0.1and $0.1, respectively)    
Debt Instrument [Line Items]    
Unamortized discount $ 0.1 0.1
Interest Rate Percentage 6.45%  
Long-term debt, gross $ 49.9 49.9
Senior notes (less unamortized discount of $1.5 and $1.6, respectively)    
Debt Instrument [Line Items]    
Unamortized discount 1.5 1.6
Long-term debt, gross $ 2,498.5 2,998.4
Senior notes (less unamortized discount of $1.5 and $1.6, respectively) | Minimum    
Debt Instrument [Line Items]    
Interest Rate Percentage 3.20%  
Senior notes (less unamortized discount of $1.5 and $1.6, respectively) | Maximum    
Debt Instrument [Line Items]    
Interest Rate Percentage 6.40%  
Subordinated Notes    
Debt Instrument [Line Items]    
Interest Rate Percentage 8.45%  
Long-term debt, gross $ 750.0 0.0
Revolving Credit Facility    
Debt Instrument [Line Items]    
Letters of credit outstanding amount 210.1  
Line of credit, remaining borrowing capacity $ 1,183.6  
Revolving Credit Facility | Line of Credit    
Debt Instrument [Line Items]    
Interest Rate Percentage 7.10%  
Long-term debt, gross $ 0.0 0.0
Foreign debt    
Debt Instrument [Line Items]    
Long-term debt, gross $ 86.0 $ 76.1
Foreign debt | Minimum    
Debt Instrument [Line Items]    
Interest Rate Percentage 12.60%  
Foreign debt | Maximum    
Debt Instrument [Line Items]    
Interest Rate Percentage 17.10%