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Inventories
12 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Inventories
Inventories

The components of inventories consisted of the following (in millions):
December 31,
 
2018
 
2017
New vehicles
 
$
1,700.1

 
$
1,553.8

Used vehicles
 
576.8

 
500.0

Parts and accessories
 
88.4

 
78.9

Total inventories
 
$
2,365.3

 
$
2,132.7



The new vehicle inventory cost is generally reduced by manufacturer holdbacks and incentives, while the related floor plan notes payable are reflective of the gross cost of the vehicle. As of December 31, 2018 and 2017, the carrying value of inventory had been reduced by $21.7 million and $19.8 million, respectively, for assistance received from manufacturers as discussed in Note 1.