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Floorplan Notes Payable - Schedule of Floorplan Notes Payable (Details) - Line of credit - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Revolving credit facility - floorplan notes payable    
Line of Credit Facility [Line Items]    
Long-term debt, gross $ 1,206.0 $ 1,251.4
Long-term debt, offset (106.8) (33.6)
Long-term debt 1,099.1 1,217.8
Other non-manufacturer facilities    
Line of Credit Facility [Line Items]    
Long-term debt 45.3 41.1
Floorplan notes payable - credit facility and other, net    
Line of Credit Facility [Line Items]    
Long-term debt 1,144.4 1,258.8
FMCC facility    
Line of Credit Facility [Line Items]    
Long-term debt, gross 208.5 160.8
Long-term debt, offset (4.1) (0.1)
Long-term debt 204.5 160.7
Other manufacturer affiliate facilities    
Line of Credit Facility [Line Items]    
Long-term debt 255.4 257.1
Floorplan notes payable - manufacturer affiliates, net    
Line of Credit Facility [Line Items]    
Long-term debt $ 459.9 $ 417.8