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Floorplan Notes Payable - Schedule of Floorplan Notes Payable (Details) - Line of credit - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Revolving credit facility - floorplan notes payable    
Line of Credit Facility [Line Items]    
Long-term debt, gross $ 1,189.8 $ 1,251.4
Long-term debt, offset (25.0) (33.6)
Long-term debt 1,164.8 1,217.8
Other non-manufacturer facilities    
Line of Credit Facility [Line Items]    
Long-term debt 35.0 41.1
Floorplan notes payable - credit facility and other, net    
Line of Credit Facility [Line Items]    
Long-term debt 1,199.8 1,258.9
FMCC facility    
Line of Credit Facility [Line Items]    
Long-term debt, gross 166.9 160.8
Long-term debt, offset (0.2) (0.1)
Long-term debt 166.7 160.7
Other manufacturer affiliate facilities    
Line of Credit Facility [Line Items]    
Long-term debt 243.8 257.1
Floorplan notes payable - manufacturer affiliates, net    
Line of Credit Facility [Line Items]    
Long-term debt $ 410.5 $ 417.8