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Inventory And Vehicle Floorplan Payable (Tables)
 9 Months Ended
Sep. 30, 2018
Inventory And Vehicle Floorplan Payable [Abstract]  
Components Of Inventory The components of inventory are as follows:
 
September 30,
2018
 
December 31,
2017
New vehicles
$
2,651.0

 
$
2,577.9

Used vehicles
517.7

 
576.5

Parts, accessories, and other
212.6

 
211.2

Inventory
$
3,381.3

 
$
3,365.6
Components Of Vehicle Floorplan Payable The components of vehicle floorplan payable are as follows:
 
September 30,
2018
 
December 31,
2017
Vehicle floorplan payable - trade
$
2,107.6

 
$
2,179.1

Vehicle floorplan payable - non-trade
1,495.7

 
1,627.8

Vehicle floorplan payable
$
3,603.3

 
$
3,806.9