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Credit Facilities and Long-term Debt - Schedule of Credit Facilities and Long-term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Debt Instrument [Line Items]    
Total long-term debt $ 8,387.7 $ 7,296.8
Less: unamortized debt issuance costs (25.1) (31.8)
Less: current maturities (net of current debt issuance costs) (192.1) (109.6)
Long-term debt, net 8,170.5 7,155.4
Senior Notes | 4.625% Senior notes due 2027    
Debt Instrument [Line Items]    
Long-term debt, gross $ 400.0 400.0
Debt stated interest rate (as a percent) 4.625%  
Senior Notes | 4.375% Senior notes due 2031    
Debt Instrument [Line Items]    
Long-term debt, gross $ 550.0 550.0
Debt stated interest rate (as a percent) 4.375%  
Senior Notes | 3.875% Senior notes due 2029    
Debt Instrument [Line Items]    
Long-term debt, gross $ 800.0 800.0
Debt stated interest rate (as a percent) 3.875%  
Non-recourse notes payable    
Debt Instrument [Line Items]    
Less: current maturities (net of current debt issuance costs) $ (58.1) (33.9)
Long-term debt, net 2,051.2 1,671.7
Non-recourse notes payable | Nonrecourse    
Debt Instrument [Line Items]    
Long-term debt, gross 2,109.3 1,705.6
Real Estate Mortgages, Finance Lease Obligation and Other Debt    
Debt Instrument [Line Items]    
Total long-term debt 1,085.9 730.7
Used and service loaner vehicle inventory financing commitments | Line of Credit    
Debt Instrument [Line Items]    
Long-term debt, gross 975.3 902.8
Revolving lines of credit | Line of Credit    
Debt Instrument [Line Items]    
Long-term debt, gross 1,633.2 1,620.7
Warehouse facilities | Line of Credit    
Debt Instrument [Line Items]    
Long-term debt, gross $ 834.0 $ 587.0