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Credit Facilities and Long-term Debt - Schedule of Credit Facilities and Long-term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Jul. 24, 2017
Floor plan notes payable: non-trade $ 1,733.3 $ 1,802.3  
Floor plan notes payable 324.4 116.8  
Total floor plan debt 2,057.7 1,919.1  
Total long-term debt outstanding 1,390.1 1,054.3  
Other debt 34.2 12.5  
Less: unamortized debt issuance costs (6.0) (6.9)  
Less: current maturities (net of current debt issuance costs) (25.9) (18.9)  
Long-term debt, less current maturities 1,358.2 1,028.5  
Line of Credit | Used vehicle inventory financing facility      
Total long-term debt outstanding 332.0 177.2  
Line of Credit | Revolving lines of credit      
Total long-term debt outstanding 131.6 94.6  
Real Estate Mortgages      
Total long-term debt outstanding 592.3 470.0  
5.25% Senior notes due 2025 | Senior Notes      
Total long-term debt outstanding $ 300.0 $ 300.0 $ 300.0
Interest rate, stated percentage 5.25%   5.25%