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Inventories (Tables)
12 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of 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