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Financing Agreements - Interest Rates and Maturities (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Nov. 30, 2023
Debt Instrument [Line Items]      
Effective interest rate 5.23%    
Finance lease obligations $ 9.2 $ 10.3  
Unamortized debt issuance costs and discounts (12.0) (14.3)  
Total financing obligations 2,180.0 1,908.4  
Less: Current financing obligations 454.4 54.0  
Total long-term financing obligations $ 1,725.6 1,854.4  
Senior Notes | Senior Unsecured Notes 4.23% Due July 2028      
Debt Instrument [Line Items]      
Stated interest rate 4.23%    
Long-term debt $ 350.0 350.0  
Senior Notes | Public Senior Note Six Point Nine Five Percent Due March Twenty Twenty-Nine      
Debt Instrument [Line Items]      
Stated interest rate 6.95%   6.95%
Long-term debt $ 500.0 500.0  
Notes payable and other      
Debt Instrument [Line Items]      
Stated interest rate 4.28%    
Long-term debt $ 47.2 54.2  
Unsecured Debt | Line of Credit | Incremental Term Loan Facility      
Debt Instrument [Line Items]      
Average interest rate as of September 30, 2024 6.20%    
Line of Credit, Current $ 400.0 0.0  
Unsecured Debt | Line of Credit | Term Loan Facility      
Debt Instrument [Line Items]      
Average interest rate as of September 30, 2024 6.20%    
Revolving loan facility $ 744.0 780.0  
Revolving Credit Facility | Line of Credit | Revolving Loan Facility      
Debt Instrument [Line Items]      
Average interest rate as of September 30, 2024 4.79%    
Revolving loan facility $ 141.6 $ 228.2