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Floorplan Notes Payable - Schedule of Floorplan Notes Payable (Details) - Line of credit - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Revolving credit facility - floorplan notes payable    
Line of Credit Facility [Line Items]    
Long-term debt, gross $ 901.6 $ 1,206.0
Long-term debt, offset (160.4) (106.8)
Long-term debt 741.2 1,099.1
Other non-manufacturer facilities    
Line of Credit Facility [Line Items]    
Long-term debt 26.4 45.3
Floorplan notes payable - credit facility and other, net    
Line of Credit Facility [Line Items]    
Long-term debt 767.6 1,144.4
FMCC facility    
Line of Credit Facility [Line Items]    
Long-term debt, gross 111.2 208.5
Long-term debt, offset (16.0) (4.1)
Long-term debt 95.2 204.5
Other manufacturer affiliate facilities    
Line of Credit Facility [Line Items]    
Long-term debt 232.3 255.4
Floorplan notes payable - manufacturer affiliates, net    
Line of Credit Facility [Line Items]    
Long-term debt $ 327.5 $ 459.9